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Data News
New Data Products, Product Updates, and Other Data Announcements2006 :: 2007 :: 2008 :: 20092009 Data NewsProcessing of the following data sets is temporarily suspended due to
the recent loss of the Defense Meteorological Satellite Program (DMSP)
F-13 satellite: NSIDC is working with our data source, Remote Sensing Systems (RSS), to acquire data for these products from the DMSP F-17 satellite. We hope to have the data processed and available by late Spring 2010. In the meantime, F-17 data are available for the following near-real-time
data sets: The Antarctic Glaciological Data Center (AGDC) at NSIDC is pleased to announce the release of a new data set, Methane Isotopes from the WAIS Divide Ice Core (NSIDC-0435). This data set includes depth, gas age, and the isotopic composition of methane (∂13C and ∂D of CH4) from the West Antarctic Ice Sheet (WAIS) Divide ice core, WDC05A, in Antarctica. For more information on Antarctic data from AGDC, see the AGDC Data Catalog Web page at http://nsidc.org/agdc/data.html. On Wednesday, 18 November 2009 from 9:00 a.m. to noon (USA Mountain Time), data access via File Transfer Protocol (FTP) will be unavailable due to NSIDC FTP server maintenance. We apologize for any inconvenience this may cause you. The AMSR-E Science Investigator-led Processing System (SIPS) team re-initialized the multi-year sea ice mask on 05 October 2009 for Version 11 (V11) of the AMSR-E/Aqua Daily L3 12.5 km Brightness Temperatures, Sea Ice Concentration, & Snow Depth Polar Grids (AE_SI12) product. Re-initializing the multi-year sea ice mask will ensure that the “Snow Depth on Sea Ice” parameter in the Northern Hemisphere is correct for the 2009/2010 winter sea ice season. The error in the Northern Hemisphere “Snow Depth on Sea Ice” parameter has not been corrected in data for previous sea ice seasons; therefore, users should exercise caution when working with the Northern Hemisphere "Snow Depth on Sea Ice" parameter in data using the V11 algorithm prior to 05 October 2009. Algorithm V12 will be implemented in the near future and AE_SI12 data for the entire AMSR-E mission will be reprocessed, correcting the "Snow Depth on Sea Ice" parameter. Registered users will be notified when V12 is installed and reprocessing begins. If you have questions, please contact NSIDC User Services. NSIDC has recently updated the following sea ice concentration data
sets: In the past, sea ice concentrations for near-real-time and preliminary sea ice data did not include concentrations below 15 percent. However, to be more consistent with the final sea ice concentration data NSIDC receives from the Goddard Space Flight Center, and to provide users with all possible data values, we have reprocessed the data to include concentrations below 15 percent. Data users should not see any changes in the sea ice data they currently have with concentrations above 15 percent. For access to updated data, please refer to the data set Web page links listed above. Both the AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures and AMSR-E/Aqua Daily Global Quarter-Degree Gridded Brightness Temperatures data sets have been updated. This quarterly update extends the time series of both data sets through 30 September 2009. This includes data in all three EASE-Grid projections (north, south, and global) as well as global quarter-degree latitude-longitude gridded data. The NSIDC Antarctic Glaciological Data Center (AGDC) has published a new data set, US ITASE Stable Isotope Data, Antarctica (NSIDC-0425). The data set includes stable isotope data from snow pits, firn, and ice cores collected by the the US component of the International Trans-Antarctic Scientific Expedition ( ITASE), between 1999 and 2007. Currently, data from 1999 and 2000 are available. Data from 20001 to 2007 will be added as they become available. For more information on Antarctic data from AGDC, see the AGDC Data Catalog Web page at http://nsidc.org/agdc/data.html. NSIDC has adjusted the algorithm used in the Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent (NISE) Version 4 product. A sea ice concentration threshold of 15 percent had been introduced in NISE Version 4, so that pixels with a sea ice concentration of 14 percent or less were assigned a value of 255, or ocean. After further analysis, we have determined that removing this threshold will provide greater consistency with NISE Version 2 data. All NISE Version 4 data have been reprocessed using this modified algorithm. For access to updated data and documentation, please refer to the NISE product catalog page. During September and early October 2009, NSIDC Distributed Active Archive Center (DAAC) data users will receive an e-mail invitation from CFI Group on behalf of NASA to participate in a Web-based survey about the quality and utility of NSIDC DAAC products and services. It takes approximately ten minutes to complete this anonymous questionnaire. Your feedback affects our future performance and helps us identify user and science needs. The NSIDC DAAC is one of twelve NASA Earth Observing System Data and Information System (EOSDIS) data centers evaluated by this survey. If you have not received an email and would like to participate, please contact the CFI group. NSIDC would like to report an error currently in two near-real-time data products: the Near-Real-Time DMSP SSM/I Daily Polar Gridded Brightness Temperatures and the Near-Real-Time DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures. A calibration problem in the F17 37H GHz channel is causing a bias of 3 to 4 Kelvin lower than should be reported for the 37H GHz channel. This bias is occurring in the data from 01 April 2009 through 15 August 2009. Channels other than the 37H GHz, and data outside of this time range, are not impacted. These data products will be updated as soon as we receive the corrected data from our data source. The Antarctic Glaciological Data Center (AGDC) at NSIDC is pleased to announce the release of a new data set, Digital Imaging for Siple Dome Ice Core Analysis, Antarctica. The data set contains high-resolution images of sections from the Siple Dome A ice core, in TIFF and JPG formats. As of 01 September 2009, the processing stream for the Near-Real-Time DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures data set has been switched from the SSM/I sensor on board the Defense Meteorological Satellite Program (DMSP) F13 satellite to the SSMIS sensor on the DMSP-F17 satellite. This change was necessary due to the F13 satellite nearing the end of its mission. For more documentation and data access, refer to the Near-Real-Time DMSP SSM/I-SSMIS Pathfinder Daily EASE-Grid Brightness Temperatures Web page. As of 28 August 2009, the processing stream for the Near-Real-Time Ice and Snow Extent (NISE) product has been switched from the SSM/I sensor on board the Defense Meteorological Satellite Program (DMSP) F13 satellite to the SSMIS sensor on the DMSP-F17 satellite. This change was necessary due to the F13 satellite nearing the end of its mission. For more information and data access, refer to the Near-Real-Time SSM/I-SSMIS EASE-Grid Daily Global Ice Concentration and Snow Extent Web page. The Antarctic Glaciological Data Center (AGDC) at NSIDC is pleased to announce the release of new data sets. For a complete listing of AGDC data, see the AGDC Data Catalog. The newly released AGDC data sets include the following: Late Holocene Climate Variability, Dry Valleys, Antarctica (NSIDC-0399) The AMSR-E sea ice team has notified NSIDC of an error with the "Snow Depth on Sea Ice" parameter in the AMSR-E/Aqua Daily L3 12.5 km Brightness Temperatures, Sea Ice Concentration, & Snow Depth Polar Grids (AE_SI12). The method of applying the dynamic multi-year ice mask used for the "Snow Depth on Sea Ice" parameter is causing large areas of the Arctic to be erroneously masked. This error does not affect the "Snow Depth on Sea Ice" parameter in the Antarctic. The sea ice team is working with the AMSR-E Science Investigator-led Processing System (SIPS) at the Global Hydrology Resource Center to determine a solution. The solution will be implemented in the V12 algorithm, and the SIPS will reprocess data from the entire AMSR-E mission. Since the sea ice concentration parameters are not affected, NSIDC will continue to distribute the AE_SI12 product with the V11 algorithm until reprocessing with the V12 algorithm is complete. Users should not work with the Northern Hemisphere "Snow Depth on Sea Ice" parameter in data using the V11 algorithm. Registered users will be notified when the V12 algorithm is implemented and reprocessing begins. We apologize for any inconvenience this may cause. If you have questions, please contact NSIDC User Services. Reprocessing is now complete for the following AMSR-E Level 3 products: Land Product: Sea Ice Products: Snow Products: All data from 19 June 2002, the beginning of the AMSR-E mission, through the present now use the most up-to-date algorithm. For more information regarding the algorithm history of AMSR-E products, refer to the Data Versions for V002 Web page. For data access and documentation, visit the Data Summaries Web page. NSIDC is pleased to announce that reprocessing is complete for AMSR-E/Aqua
L2A Global Swath Spatially-Resampled Brightness Temperatures (AE_L2A)
and AMSR-E/Aqua Daily L2B Surface Soil Moisture,
Interpretive Parms, & QC
EASE-Grids (AE_Land) data products. AE_L2A data using the Validated
10 - Stage 3 algorithm, and AE_Land data using the Validated 09 - Stage
1 algorithm, are now available from 19 June 2002 (the beginning of the
AMSR-E mission) through the present. More information regarding the algorithm
history of AMSR-E products is available on the Data
Versions for V002 Web page. The Glacier Photograph Collection has a new Search & Order Web interface. A complete redesign of the old interface has been implemented as well changes to the overall appearance of the Web site. The new Search & Order interface provides a more streamlined and efficient way for users to query the Glacier Photograph Collection database. Users can search for glaciers by spatial coverage and temporal range as well as by glacier name or by photographer. Users also now have the option of running multiple searches before placing an order. To access the new interface, see the Glacier Photograph Collection Web site. The AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures and AMSR-E/Aqua Daily Global Quarter-Degree Gridded Brightness Temperatures data sets have been updated. This update extends the time series of both data sets through 30 June 2009. These data sets remain in Version 3. Data are now available through 31 December 2008 for the Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave data set. These data will remain online until NSIDC receives the Final data from the Goddard Space Flight Center (GSFC). For information regarding this data set, or to access data via FTP, please visit the link provided above. The DMSP SSM/I Daily Polar Gridded Brightness Temperatures data set has been updated through 31 December 2008. With this update, a new version of the source data was used in the gridded brightness temperature processing. Due to this, all files beginning 01 July 2008 are now Version 3. Data remain Version 2 prior to 01 July 2008. For more information regarding the differences between the Version 2 and Version 3 files, refer to the Detailed Data Description section in the data set documentation. Data set documentation and FTP data are accessible via the product catalog page. On 17 July 2009, the MODIS/Terra Snow Cover Daily L3 Global 500m Grid (MOD10A1) Version 4 (V004) snow data product will be removed from NSIDC's archive. NSIDC will retain a small amount of MODIS V004 data from this data set for use in comparisons with other data versions. This is referred to as the Golden Month. The Golden Month covers the time period 29 August 2002 (day of year 241) through 7 October 2002 (day of year 280). For access to the V004 Golden Month data, contact NSIDC User Services. NOAA@NSIDC is pleased to announce the release of a new data set: Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004. This data set contains information on recurring spring leads and landfast ice extent in the Beaufort and Chukchi Seas from 1993 to 2004. The data set uses data acquired from the NOAA Advanced Very High Resolution Radiometer (AVHRR) and the Radarsat-1 Synthetic Aperture Radar (SAR). The data is provided in a number of formats including ArcGIS geodatabases and shapefiles. For more information about this data set and to obtain the data, see the Recurring Spring Leads and Landfast Ice in the Beaufort and Chukchi Seas, 1993-2004 summary page. Information and statistics on 157 glaciers from the Huasco Catchment in Chile have been added to the World Glacier Inventory. The information was provided by The Center for Advanced Studies in Arid Zones (CEAZA) in Chile. To search for these glaciers, select CEAZA from the Data Contributor pull-down menu from the World Glacier Inventory Search Web page. More information about this update is available in the Quality Assessment and History of Updates section of the World Glacier Inventory guide document. NSIDC is pleased to announce the release of Validated 11 (V11-Stage 1) AMSR-E Level-3 sea ice products as of 29 May 2009. The algorithm for V11 corrected an error introduced in the V10 algorithm which caused the snow depth on sea ice parameter to be overestimated by a factor of approximately two. Although AMSR-E/Aqua Daily L3 12.5 km Brightness Temperature, Sea Ice Concentration, & Snow Depth Polar Grids (AE_SI12) is the only product with the affected parameter, all AMSR-E sea ice products use the same production code and will therefore be processed with the V11 algorithm. AMSR-E Level-3 sea ice products include the following: NSIDC has officially switched its processing stream for near-real-time passive microwave brightness temperatures from the SSM/I sensor on board the Defense Meteorological Satellite Program (DMSP) F13 satellite to the SSMIS sensor on the DMSP-F17 satellite. This change in the processing stream was necessary due to a failing recorder on F13. At this time, the following products have been processed back to 10 May 2009 using F17 data: Near-Real-Time DMSP SSM/I Daily Polar Gridded Brightness Temperatures For more information regarding the processing of these products, refer to the data set documentation via the links above. As of 1 June 2009, the following Version 4 MODIS snow and sea ice data products have been removed from NSIDC's archive: Version 4 Snow Products: Version 4 Sea Ice Product: NSIDC will retain a small amount of MODIS Version 4 data from each data set for use in comparisons with other data versions. This is referred to as a golden month. The golden month covers the time period 29 August 2002 (day of year 241) through 7 October 2002 (day of year 280). For access to the Version 4 golden month data, contact NSIDC User Services. Version 5 of the above data products will remain available. NSIDC has a new URL (ftp://sidads.colorado.edu/pub/metadata/) to access our Web Accessible Metadata Folder, which contains on-line XML files representing our metadata holdings. The XML files, available in both DIF and FGDC formats, are updated on a daily basis. These metadata files are provided to allow other organizations to regularly harvest our metadata collection for inclusion in data discovery and access portals. If you currently obtain metadata via our Web Accessible Metadata Folder, please confirm that you are using the new URL (ftp://sidads.colorado.edu/pub/metadata/). Beginning 10 June 2009, Version 1 AMSR-E data will no longer be available from NSIDC. Version 1 data will remain available for ordering until 10 June 2009 through the Warehouse Inventory Search Tool (WIST), Data Pool, or the Search 'n Order Web Interface (SNOWI). NSIDC currently distributes both Version 1 and Version 2 AMSR-E products. AMSR-E Version 2 products use the most up-to-date algorithms. Due to insuficient data received, the MODIS/Terra Snow Cover Monthly L3 Global 0.05Deg CMG, Version 5 (MOD10CM) data product is missing the following granules: Reprocessing has begun for the following AMSR-E Level-3 Land, Sea Ice, and Snow data products: Land Product Sea Ice Products Snow Products Data from 19 June 2002, the date the AMSR-E mission began, through the present will be reprocessed. Another announcement will be posted when reprocessing is complete. Users of the NSIDC Antarctic Cryosphere Access Portal (A-CAP) can now save maps and download the source data for each of the layers displayed in the map. See the A-CAP News Web page for more information. The processing environment for the Graphical Interface for Subsetting, Mapping, and Ordering (GISMO) tool has recently been upgraded. Though we do not anticipate any difficulties, we recommend that users look over GISMO data order results carefully. Please report any issues you experience to NSIDC User Services. AMSR/ADEOS-II L2A Global Swath Spatially-Resampled Brightness Temperatures (AA_L2A) Version 1 data are now available from NSIDC. The data are available from 28 January until 24 October 2003, when the satellite was lost, and are restricted to NASA approved users. For information on becoming a NASA-approved user, please go to the Order Data Web page, and refer to the information under the column heading: First Time Users of AMSR/ADEOS-II Data. Both the AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures and AMSR-E/Aqua Daily Global Quarter-Degree Gridded Brightness Temperatures data sets have been updated. This update extends the time series of both data sets to 31 March 2009. The data in this update are still considered Version 3. Due to system maintenance from Monday, 20 April 2009 through Thursday, 23 April 2009, NSIDC will not receive MODIS data from our data provider. Once the maintenance period has passed, NSIDC will ingest and archive the missing MODIS data to ensure continual temporal coverage. Data are now available through June 2008 for the DMSP SSM/I Daily and Monthly Polar Gridded Sea Ice Concentrations data set. The Special Sensor Microwave Imager (SSM/I) derived ice concentrations are daily total and monthly-averaged ice fractions for both hemispheres with a temporal coverage record now spanning from June 1987 to June 2008. NSIDC is pleased to announce that AMSR-E Soil Moisture Validation data have been updated to include all data sets for the Soil Moisture Experiment 2003 (SMEX03) campaign. The SMEX03 campaign was conducted in Oklahoma, Georgia, and Alabama, USA, between 23 June and 18 July 2003, and in Brazil during the first two weeks of December 2003. For data access and documentation, visit the SMEX03 Data Sets Web page. If you have questions, please contact NSIDC User Services. Two recent improvements in tiepoints used in the AMSR-E standard sea ice concentration algorithm may result in a relative change in sea ice area and extent for users working with multiple versions of the data. The effect on the output depends on season and hemisphere, but users may notice a decline in area and extent across the Arctic and an increase in the Antarctic in data with the most recent algorithm. The algorithm changes are reflected in the change from versions B06 to T08 and T08 to V10. AMSR-E Level-3 sea ice products using the standard sea ice concentration algorithm include the following:
NSIDC encourages users to always work with the latest data (highest version number) available for a given date. Data from 19 June 2002 (start of the AMSR-E mission) to 26 January 2009 will be reprocessed to V10. We will send an announcement when reprocessing begins. More information on versions of AMSR-E data is available at the AMSR-E Versions Web page. If you have questions, please contact NSIDC User Services. The Sea Ice Index has a new look: The redesigned Sea Ice Index Web site makes it easy to see monthly and daily sea ice conditions at a glance, as well as longer term trends in ice extent and concentration from satellite passive microwave data. Images can be displayed on NASA's Blue Marble view of the Earth. The site features tools for browsing and animating data images as well as downloading extent numbers. The NSIDC Antarctic Cryosphere Access Portal (A-CAP) now contains Antarctic ice flow velocity data from the VELMAP collection. For more information, see the A-CAP News announcement, Antarctic Ice Velocity Data Now Available through A-CAP. Beginning 11 March 2009, NSIDC will no longer offer distribution on hard media (CD-ROM, DVD, DLT) for AMSR-E, MODIS, GLAS, or NISE data sets. Data will only be available via FTP Pull or FTP Push. For future orders, if you have trouble accessing data via FTP, please contact NSIDC's User Services Office for data access options. On 16 February 2009, NSIDC noticed significant problems with the Near-Real-Time (NRT) sea ice product. Upon investigation, the problem was found to be due to an issue with the DMSP F15 SSM/I 22 GHz frequency brightness temperature fields used as inputs into the sea ice algorithm. The problem began around 1 January 2009 and gradually worsened until it became noticeable in the sea ice product. NSIDC is working to correct the issue and provide reliable NRT sea ice data. In the meantime, F15 data since 1 January 2009 should not be used. The data sets affected by this problem are the following: The Sea Ice Index, Near-Real-Time DMSP SSM/I Daily Polar Gridded Brightness Temperatures, and Near-Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations. ICESAt/GLAS Release-29 data for the Laser 2B campaign (17 February 2004 to 21 March 2004) are now available for the following products: GLA01 to GLA05 and GLA07 to GLA11. This covers the atmospheric and engineering products only. The elevation/altimetry data products (GLA06 and GLA12 to GLA15) for Laser 2B are not available at this time. Please see the Release-29 Early Campaigns Altimetry Data Problem description for more information. See the ICESat/GLAS Data Releases Web site for more information and a more complete description of this new release, or contact NSIDC User Services if you have any questions. NSIDC data is included in the newest version of Google Earth, launched today. The new Ocean in Google Earth feature contains NSIDC sea ice extent data and photographs showing glaciers shrinking through time. These and other NSIDC data products are also available to Google Earth users online via NSIDC's Virtual Globes Web page. For more information about Google Earth, contact Google Press. For more information about the NSIDC data included in Google Earth, please contact NSIDC User Services. To contact members of the NSIDC press, please contact Stephanie Renfrow or +1 303.492.1497. 30 January 2009 ICESat/GLAS Release-29 data for the Laser 2A campaign (25 September 2003 to 18 November 2003) are now available for the following products: GLA01 to GLA05 and GLA07 to GLA11. This covers the atmospheric and engineering products only. The elevation/altimetry data products (GLA06 and GLA12 to GLA15) are not available at this time. Please see the Release-29 Early Campaigns Altimetry Data Problem description for more information. See the ICESat/GLAS Data Releases Web site for more information and a more complete description of this new release, or contact NSIDC User Services if you have any questions. NSIDC has released thirteen single- and few-point data sets for access through the AGDC Antarctic Cryosphere Access Portal (A-CAP). These data sets include measurements from snow pits and ice cores across Antarctica. For more information, see the A-CAP news announcement, Single and Few-Point Data Sets Now Available. NSIDC is happy to announce our support for the UArctic Atlas, which was released on 23 January 2009. The UArctic Atlas provides a visual and geographic overview of the Arctic region, including its physical environment and socio-cultural life. The Atlas is organized into five general categories such as Natural Resources; Climate, Environment, and Ecosystems; and Peoples, Cultures, and Societies. Within each catagory, you will find various map layers which can be viewed either in a map viewer, in your browser, or opened in Google Earth. This project was developed by the University of the Arctic, with map layer data provided by a number of partner organizations including NSIDC. One example of the type of data provided by NSIDC is the Circum-Arctic Map of Permafrost and Ground-Ice Conditions data set published by our Frozen Ground Data Center. The Atlas links users to the guide document for a particular data set as well as the associated Google Earth compatible files located on our Virtual Globes Web site. Production of MODIS Terra and Aqua snow and sea ice products have resumed, and both Terra and Aqua products are almost caught up. Due to a hardware failure on 29 December 2008, production of MODIS Terra and Aqua snow and sea ice products have been suspended indefinitely. On 08 January 2009, production of Terra snow and sea ice products resumed and is nearly caught up. Production of Aqua snow and sea ice products have not resumed. The problem is being worked, and we hope for production to resume in the near future. Additional data sets are now available from the Antarctic Cryosphere Access Portal (A-CAP). The data sets include elevation and ice thickness in Western Marie Bird Land, and laser altimetry of the Thwaites Glacier Catchment in Western Antarctica. Also, additional ice core locations have been added to the A-CAP Antarctic ice core overlay. For more information, see the A-CAP News Web page. 2008 Data NewsThe AIDJEX Documentary Film, available on DVD, describes a pilot study conducted in 1972 in preparation for the Arctic Ice Dynamics Joint Experiment's (AIDJEX) main experiment from 1975 to 1976. The study includes a main camp on drifting sea ice in the Beaufort Sea north of Alaska along with two satellite camps forming a station triangle with a 100 km side length. Please contact NSIDC User Services to obtain a copy of this DVD. Four additional data sets are now available via the Antarctic Cryosphere Access Portal (A-CAP). The newly available data sets include ice thickness, surface velocity of Taylor Glacier, and basemaps for accumulation and Surface Mass Balance (SMB). Read more about the new data sets on the A-CAP News Web page. ICESat/GLAS Release-29 data for the Laser 1A (20 February 2003 to 21 March 2003) and 1B (21 March 2003 to 29 March 2003) campaigns are now available for the following products: GLA01 to GLA05 and GLA07 to GLA09. This covers the atmospheric and engineering products only. The elevation/altimetry data products (GLA06 and GLA12 to GLA15) are not available at this time. Please see the Release-29 Laser 1A and 1B Altimetry Problem description for more information. See the ICESat/GLAS Data Releases Web site for more information and a more complete description of this new release, or contact NSIDC User Services if you have any questions. Beginning on 01 December 2008, AMSR-E Level-2 and Level-3 Land products and Level-3 Snow products are Stage 1 validated. Stage 1 refers to the estimation of product accuracy by using a small number of independent measurements obtained from selected locations, time periods, and ground-truth/field program efforts. The Level-2 Land product and Level-3 Snow products transitioned from Transitional 08 (T08) to Validated 09 (V09). The Level-3 Land product transitioned from T05 to V06. No changes were made to the algorithms. The products involved in this validation include the following: AMSR-E/Aqua L2B Surface Soil Moisture, Ancillary Parms, & QC EASE-Grids(AE_Land) The data set, Subglacial topography: airborne geophysical survey of the Amundsen Sea Embayment, Antarctica (NSIDC-0292), is now available through the NSIDC Antarctic Cryosphere Access Portal (A-CAP). For more information, see the A-CAP announcement Web page. The online NSIDC Glacier Photograph Collection has doubled in size since January 2008, with more than 10,000 high-resolution photographs of glaciers worldwide available for free. For more information, see the full NSIDC press announcement Web page. NSIDC has released new ICESat/GLAS data. Release-29 data for the Laser 3J time period (17 February 2008 to 21 March 2008) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. Release-29 incorporates significant and extensive changes to the atmosphere processing, additions and corrections to the waveform and elevation processing, and the incorporation of new tide models. See the ICESat/GLAS Data Releases Web site for more information and a more complete description of this new release, or contact NSIDC User Services if you have any questions. NSIDC would like to inform you that due to intermittent satellite maneuvers throughout the lifetime of Terra and Aqua, some geolocation information in MODIS data is incorrect. Data with erroneous geolocation information are being reprocessed to eliminate data that do not meet specifications. Reprocessing of all affected data is expected to be complete in Spring of 2009. For information regarding the dates and times of the maneuvers with the affected data, visit the MODIS Land Quality Assessment Web site. NSIDC has recently updated the Northern Hemisphere TOVS Pathfinder Path-P Daily and Monthly Polar Gridded Atmospheric Parameters data set. The data now span July 1979 to December 2005. Additional changes to the Northern and Southern TOVS data include a new file naming convention, a new FTP directory structure, and tar-on-the-fly capabilities described in the readme.txt file on the FTP site. Data set documentation and FTP access are available from the data set Web page. If you have any questions, please contact NSIDC User Services. NSIDC is pleased to announce that the DMSP SSM/I Daily Polar Gridded Brightness Temperatures data set has been updated through June 2008. Data set documentation and FTP data access are available from the data set documentation. If you have any questions, please contact NSIDC User Services. Release-29 data for the Laser 3I time period (02 October 2007 to 05 November 2007) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. Release-29 incorporates significant and extensive changes to the atmosphere processing, additions and corrections to the waveform and elevation processing, and the incorporation of new tide models. See the ICESat/GLAS Data Releases Web site for more information and a more complete description of this new release, or contact NSIDC User Services if you have any questions. Reprocessing is complete for all AMSR-E/Aqua Level-3 products. Data from 19 June 2002 (the start of the AMSR-E mission) to present are now Version 2, the validated or transitional version of the algorithm. The Level 3 products include: Land Rain Ocean Sea Ice Snow Reprocessing is complete for all AMSR-E/Aqua Level-2B products. Data from 19 June 2002 (the start of the AMSR-E mission) to present are now Version 2, the validated or transitional version of the algorithm. The Level-2B products include: Ocean Rain Land NSIDC is pleased to announce a recent update to the Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I data set. The daily and monthly data have been updated and now span 26 October 1978 through 31 December 2007 for the northern and southern hemispheres. For additional information on this data set or to access the data, please see the data set documentation. NSIDC is pleased to announce that sea ice concentrations from AMSR-E/Aqua Daily L3 12.5 km Brightness Temperatures, Sea Ice Concentration, & Snow Depth Polar Grids (AE_SI12) were created as .kml files for use in Earth browsers, such as Google Earth. These files include the latest 30-day, 60-day, and 90-day animations of the daily sea ice concentrations and sea ice extent in the Arctic. The animations are updated daily and are available at the NSIDC Virtual Globes: Technical Experiments Web site. Reprocessing started for all AMSR-E Level 3 sea ice products with data from 19 June 2002, the start of the AMSR-E mission, and will continue through 5 July 2008. Forward processing began on 6 July 08. Reprocessing is expected to take several months to complete. The following sea ice products are affected:
The algorithms for all Level 3 sea ice products are at the Transitional 08 (T08) level and incremented from Version 1 to Version 2. Sea ice temperature was removed from the AE_SI25 algorithm due to inherent ambiguities between changes in the physical temperature of the ice and changes in the ice emissivity; thus, the AE_SI25 product name also changed to AMSR-E/Aqua Daily L3 25 km Brightness Temperature & Sea Ice Concentration Polar Grids. For a complete list of sea ice algorithm changes, as well ordering options and documentation, see the AMSR-E Data Versions Web page. Release-28 data for the Laser 2C time period (18 May 2004 to 21 June 2004) are available for the following products: GLA01 to GLA09 and GLA12 to GLA15. This is the first public release of Laser 2C data. Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information, or contact User Services if you have any questions or for a more complete description. Due to an error in an ancillary data file, the following Version 2 AMSR-E Level 3 snow products were removed from NSIDC's archives:
The bad ancillary data file creates an incorrect Snow Water Equivalent (SWE) flag. Any AMSR-E Level 3 snowfall data using the Transitional 08 Algorithm (T08) received from NSIDC prior to 23 July 2008 should not be used. The filename has the variable T08 in it. Beginning 28 July 2008, new Version 2 AMSR-E Level 3 snow products were generated for 21 July 2008 and will continue with forward processing. Reprocessing will beginning with 19 June 2002, the start of the AMSR-E mission, and continue through 20 July 2008. The algorithm will remain at the T08 level. For more information, contact NSIDC User Services. As of 06 July 2008, Version 2 of AMSR-E Level 3 land, rain, ocean, snow, and sea ice products are now available at NSIDC, and are considered Transitional (T) or Validated (V). The following is a listing of the Level 3 products. Land Product (Algorithm: T05) Rain Product (Algorithm: V06 - Stage 2) Ocean Products (Algorithm: V03 - Stage 2)
Sea Ice Products (Algorithm: T07)
Snow Products (Algorithm: T08)
Delivered Algorithm Packages (DAPs) are also available for these products. If you are interested in receiving the DAP, or for more information, contact NSIDC User Services. NSIDC has created and released the MODIS Interactive Subsetting Tool (MIST) for public use. NSIDC created MIST in order to provide users with a 7 km by 7 km subset time series of certain Version 5 (V005) MODIS products over the Greenland Climate Network (GC-Net) and the International Arctic Systems for Observing the Atmosphere (IASOA) stations. MIST also provides limited online analysis capabilities that include generating time series and scatter plots. Data are provided in a text Comma Separated Value (CSV) file format, courtesy of the Oak Ridge National Laboratory Distributive Active Archive Center (ORNL DAAC). For more information, contact NSIDC User Services. Release-28 data for the Laser 3J time period (17 February 2008 to 21 March 2008) are available for the following products: GLA01 to GLA09 and GLA12 to GLA15. This is the first public release of Laser 3J data. Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information, or contact User Services if you have any questions or for a more complete description. NSIDC has recently updated the Sea Ice Trends and Climatologies from SMMR and SSM/I data products. These value-added products are now only derived from the Goddard Space Flight Center (GSFC) sea ice data sets: the NASA Team Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave data set and the Bootstrap Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I data set. The NASA Team sea ice data now span 1979 – 2007, and the Bootstrap sea ice data now span 1979 – 2006. For additional information on the sea ice trends and climatologies, please see the Sea Ice Trends and Climatologies from SMMR and SSM/I product Web site. If you have any questions, please contact NSIDC User Services. Data are now available through December 2007 for the Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave data set. Reprocessed Release-28 data are now available for the Laser 1A time period (20 February 2003 to 21 March 2003) for the products GLA05-GLA09 and GLA12-GLA15. Previously these data were released as 228 in the new file naming convention, but they have now been processed to the highest level of processing at 428. For further information on the differences between the 228 and 428 designations, please see the YXX Release Numbers document. Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information, or contact User Services if you have any questions or for a more complete description. 22 April 2008 The Discovery, Access, and Delivery of Data for IPY (DADDI) search and access system is now available to all IPY data users. This interface provides access to Arctic data from the four DADDI partners: NSIDC, the Socioeconomic Data and Applications Center (SEDAC), The Oak Ridge National Laboratory Distributed Active Archive Center for Biogeochemical Dynamics (ORNL DAAC), and the Canadian Cryospheric Information Network (CCIN). In addition, all IPY data registered in the IPY Metadata Portal at the Global Change Master Directory (GCMD) are also searchable. The DADDI search system does not replace the GCMD but augments it by providing a different search and presentation interface, including filters and faceted search options. Direct links to data are included in the DADDI search output where sufficient information is provided from the data source. Access to the DADDI search system is available through the IPY Data and Information Service (IPYDIS) and the DADDI Web page. 14 April 2008 To users of the EOS Data Gateway (EDG): Please note that the Warehouse Inventory Search Tool (WIST) will be replacing the EDG. At the end of April 2008, we are requesting that registered users migrate your user accounts and begin using WIST. We will send registered users an email with further information on WIST and the migration process. We also encourage guest users to begin using WIST at the end of April. For more information, contact User Services. 31 March 2008 Release-28 data for the Laser 3I time period (02 October 2007 to 05 November 2007) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3I data. Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information, or contact User Services if you have any questions or for a more complete description. 04 March 2008 NSIDC has released the Greenland Ice Sheet Melt Characteristics Derived from Passive Microwave Data data set which is a binary indicator of the state of melt of each pixel on the Greenland ice sheet for each day of observation. The Greenland ice sheet melt extent data, acquired as part of NASA's Program for Arctic Regional Climate Assessment (PARCA) program, is a daily estimate of the spatial extent of wet snow on the Greenland ice sheet since 1979. It is derived from SSM/I and SMMR passive microwave satellite brightness temperature characteristics using the cross-polarized gradient ratio (XPGR) of Abdalati and Steffen (1997). The data are provided in a variety of formats including raw data in ASCII format, data in binary format gridded on a Greenland subset of the Northern Hemisphere polar stereographic projection, and annual and complete time series climatologies in binary and GeoTIFF format all at a resolution of 25 km. All data are available via FTP. 22 February 2008 NSIDC has released the Global EASE-Grid 8-day Blended SSM/I and MODIS Snow Cover data set suitable for continental- to hemispheric-scale seasonal fluctuations of snow covered area (SCA) and snow water equivalent (SWE). This data set comprises global, 8-day SWE data from 2000 through 2007, enhanced with snow-covered area derived from MODIS visible wavelength bands. The new data set blends visible and microwave data at higher temporal resolution (8-day) than NSIDC has offered before; and it is our first snow cover product to be released in netCDF format, specifically at the request of modelers. Produced in the 25-kilometer Equal-Area Scaleable Earth Grid (EASE-Grid), the new product is unique in blending information from both passive microwave and visible sensors on a global scale for the period when both types of sensor data are available. 16 January 2008 The AVHRR Polar Pathfinder Twice-Daily 5 km EASE-grid Composites data set has been updated. This update extends the time series to 30 June 2005. The data in this update is still considered Version 3. This update includes:
2007 Data News29 December 2007 Erroneous MODIS Version 005 Snow Cover Data The MODIS/Terra and MODIS/Aqua Snow Cover Daily L3 Global 0.05Deg CMG data products (MOD10C1.v005 and MYD10C1.v005) and the Snow Cover 8-Day L3 Global 0.05Deg CMG data products (MOD10C2.v005 and MYD10C2.v005) were processed with corrupted tile indices as a result of incorrect static input files. Static input files determine and map each tile pixel to the corresponding 0.05-degree pixel in the CMG lat-lon grid. Reprocessing of the erroneous data for 2003 and 2004 is complete. NSIDC
expects to receive 2007 reprocessed data by 07 December 2007. For more
detailed information about the errors, please visit the MODIS
Land Science Data Discipline Team Web site.
17 December 2007 World Glacier Inventory: More than 34,000 glaciers in China have been added to the World Glacier Inventory. For more information, please see the Quality Assessment and History of Updates section of the data set documentation. To access the new data from this update, proceed to the World Glacier Inventory search page and select "CAREERI, Lanzhou, China. Che/Wu" from the Data Contributor pull-down menu. 11 December 2007 Loss of AMSR-E Aqua GBAD Data On 2 December 2007, an anomaly developed on the Aqua spacecraft which prevented the production of Ground Based Attitude Determination (GBAD) data. Due to the loss of GBAD data, AMSR-E data production was stopped. Data production resumed on 7 December 2007; however, products are slightly delayed. Production is expected to return to normal by 12 December. All data for 2 December through 6 December is expected to be recovered and will be available from NSIDC. 27 November 2007 NSIDC is exhibiting at the 2007 American Geophysical Union (AGU) Fall Meeting in San Francisco from December 11 - 14. Please stop by and visit NSIDC staff at Booth No. 139. 12 November 2007 NOAA@NSIDC has published Sea Ice Charts of the Russian Arctic in Gridded Format, 1933-2006. These data, from the Arctic and Antarctic Research Institute in St. Petersburg, Russia, are an important new data source for those studying the role of sea ice in climate change. 30 October 2007 NSIDC Metadata Now Accessible: Collection-level metadata are now available on NSIDC's Web site for all data products. You can view this metadata in three different ways: from the catalog page, from a utility, or from an FTP site. The catalog page for each data set now includes a View Metadata Record link below the data set summary, which accesses a dynamically-generated Web page with metadata that conform to the Global Change Master Directory (GCMD) Directory Interchange Format (DIF) standard (see example). Additional metadata output options on this Web page include DIF in plain text, DIF in Extensible Markup Language (XML), and U.S. Federal Geographic Data Committee (FGDC) Content Standard for Digital Geospatial Metadata (CSDGM) in Hypertext Markup Language (HTML), plain text, and XML. Also, included on this Web page is an interactive Google Map that displays the spatial coverage for the data set. The second way to view metadata is by using the same utility that created the dynamically-generated Web page to construct your own Web page with your own format and style. For more information on how to do this, please see the get_metadata.pl Web page. In addition, metadata for all of our holdings are also available in XML files for both DIF and FGDC standards at the following FTP site: ftp://sidads.colorado.edu/pub/incoming/metadata/. Updated on a daily basis, these FTP folders are provided to allow other organizations to regularly harvest our metadata collection for inclusion in data discovery and access portals. 18 October 2007 ICESat/GLAS: Release-28 data for the Laser 3C time period (20 May 2005 to 23 June 2005) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3C data*, and it is another release of GLAS data with the satellite's attitude in "airplane" mode. Please contact User Services for a more complete description. *Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information. 27 September 2007 Today's update to the Glacier Photograph Collection includes 50 photographs taken between 1890 and 1996. Represented in this batch are Colorado glacier photographs taken by Junius Henderson, Oscar A. Randolph, Rudolph Johnson, and Russell Allen. The glaciers are Andrews, Arapaho, Fair, Isabel, Mills, Saint Vrain and Taylor. Other photos include a series of Franz Josef Glacier (1951-1964), and Harry Fielding Reid images of John Muir's cabin taken in 1890. 25 September 2007 ICESat/GLAS: Release-28 data for the Laser 3F time period (24 May 2006 to 26 June 2006) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3F data*, and it is also the first release of GLAS data with the satellite's attitude in "airplane" mode. Depending on the time of year, the satellite's attitude is changed from airplane to sailboat to accommodate sun angle changes and for power and thermal stability. *Release-28 provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 20 September 2007 The complete times series of Version 4 data for the MODIS/Terra Snow Cover 8-day L3 Global 500m Grid (MOD10A2) product and the MODIS/Terra Snow Cover 8-day L3 Global 0.05Deg CMG (MOD10C2) product are now available from the Data Pool and will remain available indefinitely. The time series extends from Feb 2000 through Dec 2006. 20 September 2007 The complete times series of Version 2 data for the Near-Real-Time SSM/I EASE-Grid Daily Global Ice Concentration and Snow Extent product is now available from the Data Pool and will remain available indefinitely. The time series extends from 04 May 1995 through present. 04 September 2007 ICESat/GLAS: Release-28 data for the Laser 3H time period (12 March 2007 to 14 April 2007) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3H data. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. September 2007 NOAA@NSIDC is pleased to announce updates to the Glacier Photograph Collection. More than 1,200 photographs of Greenland glaciers have been digitized from slides and are available online for viewing and downloading. The Greenland photograph collection was donated to the World Data Center for Glaciology, Boulder in the mid 1980s by Captain Ron Kollmeyer of the U.S. Coast Guard. Captain Kollmeyer was the lead for the Greenland Glacier Survey. The photographs of western Greenland glaciers were taken between 1969 and 1980, from ground observation stations and from U.S. Coast Guard helicopters at an altitude between 100 and 1,000 feet. To access the new data from this update, proceed to http://nsidc.org/data/glacier_photo/photo_query.html and select "Country" from the available search options. On the next screen choose "Greenland (DK)" from the Country pull-down menu. 07 August 2007 AMSR/ADEOS-II L1A Raw Observation Counts (AMSR_L1A), Version 2: This data set is now available from NSIDC. The data are available for 28 January until 24 October 2003, when the satellite was lost, and are restricted to NASA approved users. For information on becoming a NASA approved user, please go to the Order Data Web page, and refer to the information under the column heading: First Time Users of AMSR/ADEOS-II Data. August 2007 The World Glacier Inventory has recently been updated. Over 1,600 glaciers from the former Soviet Union were added and errors with 368 glacier IDs were identified and corrected. For more information, please see the "Quality Assessment and History of Updates" section in the data set "Documentation" for further details about these updates. To access the new data from this update, proceed to the World Glacier Inventory search page, and select "Institute of Geography, Russian Academy of Science. Chernova" from the Data Contributor pull-down menu. 26 July 2007 Trapped Gas Composition and Chronology of the Vostok Ice Core: This AGDC data set includes a time scale for the Vostok ice core, retrieved from Vostok Station on the East Antarctic Plateau. Investigators analyzed the molecular oxygen to nitrogen (O2/N2) ratios and the delta oxygen-18 (δ18O) record for approximately the past 115,000 to 400,000 years in the Vostok ice core. 10 July 2007 Carbon-13 Isotopic Composition of Atmospheric Methane in Firn Air, Siple Dome, Antarctica: This AGDC data set includes records of the delta carbon-13 (d13C) of methane (CH4) in firn air from the South Pole and trapped in bubbles in a short ice core from Siple Dome, Antarctica. Using two firn air samples, investigators reconstructed records of the isotopic composition of paleoatmospheric methane covering the last 2 centuries, from 1820 to 2001. 10 July 2007 Radar Investigations of Antarctic Ice Stream Margins, Siple Dome, 1998: This AGDC data set consists of surface-based radar measurements, including geometry of the bed, surface, and internal layers, and bed reflectivity measurements at two sites along ice stream margins at Siple Dome, Antarctica. 30 June 2007 March through August Ice Edge Positions in the Nordic Seas, 1750-2002: This new NOAA data set contains ice edge positions from ship logbooks, diaries, and other sources, in addition to more recent satellite data products. Data are available as ASCII text, browse images, and as shapefiles (GIS format). This long record sheds light on ice edge variability through regional shifts in climate. 21 June 2007 GLAS/ICESat Laser Altimetry Digital Elevation Models (DEMs) of Antarctica and Greenland: These two new digital elevation models (DEMs) of Antarctica and Greenland were derived from GLAS/ICESat laser altimetry profile data and provide new surface elevation grids of the ice sheets and coastal areas, with greater latitudinal extent and fewer slope-related effects than radar altimetry. These DEM data sets were generated from the first seven operational periods (from February 2003 through June 2005) of the GLAS instrument. They are provided on polar stereographic grids at 500 m grid spacing for Antarctica and 1 km grid spacing for Greenland. 8 June 2007 Cosmogenic Radionuclides in the Siple Dome A Ice Core: This AGDC data set includes a record of cosmogenic radionuclide concentrations in the Siple Dome A ice core collected as part of the West Antarctic ice core program. The investigators measured profiles of both 10Be and 36Cl in the entire ice core, which spans the time period from the present to about 100,000 years before present. 22 May 2007 Paleoenvironment, Geomorphic Processes, and Carbon Stocks of Drained Thaw-lake Basins in the Arctic Coastal Plain, Alaska, USA, 2002-2005: This ARCSS data set is from a study of the origin and associated geomorphological, ecological, and pedological processes of thaw-lake basins of the Arctic Coastal Plain, Alaska. Investigators used radiometric dating, microfossil analysis, and soil development to determine whether carbon accumulation rates respond to regional changes in climate, or if they are influenced by local rates of plant succession. 18 May 2007 High-Resolution Rectified Aerial Photography for Collaborative Research of Environmental Change at Barrow, Alaska, USA: This ARCSS data set includes aerial photography of Barrow, Alaska, which has been geocorrected to a 2002 QuickBird satellite image or Interferometric Synthetic Aperture Radar (IFSAR) imagery. Photography included in the set is from eight specific dates, which span from 1948 to 1997: 4 August 1948, 29 July 1949, 12-14 August 1955, 12-24 August 1962, 14 July 1964, 15 July 1979, 31 August 1984, and 16 July 1997. 9 May 2007 ICESat/GLAS: Release-28 data for the Laser 1 time period (20 February 2003 to 21 March 2003) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 7 May 2007 NSIDC Atlas of the Cryosphere: The NSIDC Atlas of the Cryosphere is a dynamic mapping Web site that allows the visitor to explore the Earth's frozen regions. Viewed from a polar perspective, the available scenes includes snow cover, sea ice extent and concentration, glaciers, permafrost, and other critical components of the Earth's cryosphere. The user can zoom in to a specific region on the Earth as well as overlay country borders, major cities, and other geographic information. 24 April 2007 ICESat/GLAS: Release-28 data for the Laser 3G time period (25 October 2006 to 27 November 2006) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 22 April 2007 Good Days on the Trail, 1938-1942 was shown as part of the University of Colorado International Film Series. The film, with color footage of CU students on alpine hikes, provides a glimpse into the mountaineering lifestyle of an earlier time, along with shots of Arapaho Glacier and other Front Range glaciers. Scientists from NSIDC and the CU Institute of Arctic and Alpine Research narrated. The film is being preserved and digitized with support from the NOAA National Geophysical Data Center and the Climate Database Modernization Program. 30 March 2007 ICESat/GLAS: Release-28 data for the Laser 2A time period (25 September 2003 to 18 November 2003) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 19 March 2007 Vertical Strain at Siple Dome, Antarctica, 1999-2002: This AGDC data set consists of a table of long-term average strain rates measured between 1999 and 2002 at Siple Dome, Antarctica as a part of the West Antarctic Ice Sheet Cores (WAISCORES) project for deep ice coring in West Antarctica. 19 March 2007 Model Output Assessing Net Carbon Exchange Across the Arctic Tundra-Boreal Forest Transition in Alaska, 1981-2000: This ARCSS data set includes simulated temporal and spatial patterns of net carbon exchange in Alaskan ecosystems that span the transition from Arctic tundra to boreal forest. Investigators modeled net carbon storage along with vegetation and soil carbon and nitrogen pools in tundra, shrub tundra, and tree line evergreen conifer forest ecosystems using the Terrestrial Ecosystem Model (TEM) 5.0. 16 February 2007 Oxygen and Deuterium Isotope Measurements from Siberia, 2002-2004: This ARCSS data set contains measurements from a stable isotope analysis of rain, snow, the Kolyma River, and a local stream near Cherskii, Siberia. As part of the Russian-American Initiative on Shelf-land Environments (RAISE) program, this research was designed to quantify the impacts of disturbance on the seasonal cycle of atmospheric carbon dioxide and the discharge of carbon and nitrogen into the Arctic Ocean in forest and shrubby tundra regions. 26 January 2007 Mooring and Drifting Buoy Data: Beaufort Gyre Freshwater Experiment, 2003: This brokered product, supported by the ADCC, contains temperature time series, salinity, current, sea ice draft, and bottom pressure measurements. Investigators established an observational program to measure the freshwater content (in sea ice and in the ocean) of freshwater fluxes in the Beaufort Gyre using moorings and drifting buoys during the summer of 2003. 17 January 2007 ICESat/GLAS: Release-28 data for the Laser 3A time period (03 October 2004 to 08 November 2004) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This is the first public release of Laser 3A data for some altimetry products. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 16 January 2007 MODIS/Terra: The complete time series of MODIS/Terra Snow Cover Daily L3 Global 0.05Deg CMG V004 (MOD10C1 V004) data is now available through the online Data Pool and will remain there indefinitely. 16 January 2007 MODIS/Aqua Version 5 Snow and Sea Ice Products: NSIDC is pleased to announce the release of Version 5 (V005) reprocessed MODIS/Aqua snow products, which contain several improvements over the previous versions. For example, monthly snow products are available in a Climate Modeling Grid (CMG) format, fractional snow cover was added to MYD10_L2 and MYD10A1 products, browse images are available for all products, Sea Ice by Ice Surface Temperature (IST) and combined sea ice fields were removed, and all products use HDF compression making the file size much smaller. 2006 Data News28 December 2006 MODIS/Terra Version 5 Snow Products: NSIDC is pleased to announce the release of Version 5 (V005) reprocessed MODIS/Terra snow products, which contain several improvements over the previous versions. For example, monthly snow products are available in a Climate Modeling Grid (CMG) format, fractional snow cover was added to MOD10_L2 and MOD10A1 products, browse images are available for all products, and all products use HDF compression making the file size much smaller. 27 December 2006 ICESat/GLAS: Release-28 data for the Laser 3B time period (17 February to 24 March 2005) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 20 December 2006 Coring Data from Drained Thaw-Lake Basins of the Arctic Coastal Plain, Alaska: This ARCSS data set includes measurements and observations from drained thaw-lake basin (DTLB) cores retrieved from Barrow and Atqasuk, Alaska in April and August of 2001 through 2003. 8 December 2006 MODIS/Terra Version 5 Sea Ice Products: NSIDC is pleased to announce the release of Version 5 (V005) reprocessed MODIS/Terra sea ice products, which contain several improvements over the previous versions. For example, Sea Ice by Ice Surface Temperature (IST) and combined sea ice fields were removed, browse images are now available, and all V005 products use HDF compression making the file size much smaller. 8 December 2006 AMSR-E/Aqua Daily EASE-Grid Brightness Temperatures: NSIDC produces AMSR-E gridded brightness temperature data by interpolating AMSR-E data to the output grids from swath space using an inverse-distance squared method. Data for the Northern Hemisphere and Southern Hemisphere EASE-Grid projections, at 25 km resolution, are now available. Data begin 19 June 2002, and processing is ongoing. 7 December 2006 SHEBA Upper Ocean CTD and Thermal Microstructure, Western Arctic Ocean: This ARCSS data set includes conductivity, temperature, and depth (CTD) measurements along with turbulent thermal variance, turbulent kinetic energy, and vertical temperature gradient data collected from 12 October 1997 to 30 September 1998 in the Western Arctic Ocean. 14 November 2006 ICESat/GLAS: Release-28 data for the Laser 2B time period (17 February to 21 March 2004) are available for all 15 GLAS products (GLA10 and GLA11 coverage to 4 March 2004). This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 8 November 2006 National Ice Center Sea Ice Charts and Climatologies in Gridded Format: The U.S. National Ice Center (NIC) is an interagency NOAA, Navy, and Coast Guard operational sea ice analysis and forecasting center. Since 1972, NIC has produced weekly or biweekly Arctic and Antarctic sea ice charts. These analyses are produced using available in situ, remotely sensed, and model data sources. They are generated primarily for mission planning and safety of navigation. Overall, the record of sea ice concentration from the NIC series is believed to be more accurate than that from passive microwave sensors, especially from the mid-1990s on. This data set is an Arctic sea ice concentration climatology derived from the chart series. The climatology consists of median, maximum, minimum, first quartile, and 3rd quartile concentrations as well as frequency of occurrence of ice at any concentration for 33 year, 10 year, and 5 year periods. 7 November 2006 Atmospheric Nitrate Isotopic Analysis at Amundsen-Scott South Pole Station, A Twenty-Five Year Record:This AGDC data set contains snow pit measurements of oxygen isotopes in nitrate and ion concentrations, along with supplementary surface measurements of oxygen isotopes in nitrate and in nitrate aerosols from the Amundsen-Scott South Pole Station, Antarctica. 1 November 2006 Resource Allocation and Allometry of Plant Growth at Selected Sites in the Arctic: 2003-2005 Growing Seasons: This ARCSS data set consists of measurements from Arctic field sites during the summer months from 5 July 2003 to 5 August 2005 as part of the Land-Atmosphere-Ice Interactions (LAII) International Tundra Experiment (ITEX). Investigators designed this research, which compares an extensive range of vegetation types that exists in widely-separated sites, to help identify the relative vulnerability of different vegetation types, plant functional types, and species to climate change and other forms of disturbances. 31 October 2006 Subglacial Topography: Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica: This AGDC data set includes 5 km gridded data from the Airborne Geophysical Survey of the Amundsen Sea Embayment, Antarctica (AGASEA) conducted during the 2004-2005 austral summer. Investigators derived maps of the ice sheet surface and subglacial topography, which covers the entire catchments of both the Thwaites Glacier and the Pine Islands Glacier, from airborne survey systems mounted on a Twin Otter aircraft. 30 October 2006 ICESat/GLAS: Release-28 data for the Laser 3D time period (21 October 2005 to 24 November 2005) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. 25 October 2006 Sea Ice Concentrations from Nimbus-7 SMMR and DMSP SSM/I Passive Microwave Data: An update for this product is now available. Changes include new “preliminary” data for users who need more current data, new file naming, a new FTP directory structure, and updated documentation. 25 October 2006 Near-Real-Time DMSP SSM/I Daily Polar Gridded Sea Ice Concentrations: An update for this product is now available. Changes include new binary data format, new file naming, a new FTP directory structure, and updated documentation. 18 October 2006 AWS Data: Characteristics of Snow Megadunes and Their Potential Effect on Ice Core Interpretation: This AGDC data set contains automated weather station (AWS) data from two sites on the East Antarctic Plateau where investigators conducted field research on the Antarctic megadunes. The stations collected snow/firn temperature, air temperature, air pressure, and wind data from 16 January 2004 to 17 November 2004. 16 October 2006 ICESat/GLAS: Release-28 data for the Laser 3E time period (22 February 2006 to 27 March 2006) are available for the following products: GLA01 - GLA09 and GLA12 - GLA15. This release provides numerous enhancements, such as improved corrections for saturation effects, improved flags to aid users in data selection, and better descriptions of the altimetry products. See ICESat/GLAS Data Releases for more information, including details about a change in file names with this release. 29 September 2006 Monthly Mean Precipitation Sums at Russian Arctic Stations, 1966-1990: This NOAA data product includes measurements from 216 Russian Arctic stations to fill gaps in the historical precipitation record that are needed for applications including reanalysis validation and study of changing climate. 28 September 2006 Time Series of Seasonally Frozen Ground Depth in the Russian Arctic, 1930-1990: This ARCSS data set consists of seasonally frozen ground depth measurements based on soil temperatures in the Russian Arctic. Investigators constructed a record that extends from 1930 to 1990 using data from 211 ground-based stations. 28 September 2006 Estimating Sea Ice Floe Velocities to Characterize Whaling Seasons Using Satellite Imagery of the Chukchi and Beaufort Seas, Spring 2000 and 2001: This ARCSS data set contains SAR images from the RADARSAT and the ERS - 2 satellites along with broadband visible and infrared images from the AVHRR satellite. Data cover two spring whaling seasons in the Chukchi and Beaufort Seas from March to June in 2000 and 2001. 15 September 2006 Submarine Upward Looking Sonar Ice Draft Profile Data and Statistics: Sixteen cruises were added to this NOAA@NSIDC data set, markedly increasing the spatial and temporal coverage of these data that are used for sea ice thickness estimates. 22 August 2006 Firn Air Chemistry Observations from Siple Dome, 1996, and the South Pole, 2001: This AGDC data set includes gas ratios in polar firn air. Investigators sampled air from bubbles in the firn-ice transition region to observe and model the processes of gravitational settling, thermal fractionation, and preferential exclusion within the Antarctic snowpack. 31 July 2006 DMSP SSM/I Daily Polar Gridded Brightness Temperatures: NSIDC is now distributing Version 2 of this data set. Changes include reprocessing to correct an error in 1987-1999 data, full distribution via FTP, conversion from HDF to binary, and a new file naming convention. See the online documentation for more information. 21 July 2006 North Pole Environmental Observatory PMEL/CRREL 2000-2003 Ice Temperature and Mass Balance Buoy Data: This ADCC data set contains ice temperature and mass balance data from drifting ice buoys near the North Pole in the Central Basin of the Arctic Ocean. Buoys were deployed each April by the Pacific Marine Environmental Laboratory (PMEL) and the Cold Regions Research and Engineering Laboratory (CRREL). 13 June 2006 GPR and GPS Data: Characteristics of Snow Megadunes and their Potential Effects on Ice Core Interpretation: This AGDC data set contains ground penetrating radar (GPR) data showing surface morphology and internal layering structure along with global positioning system (GPS) data collected within an area of 60 km2 on the East Antarctic Plateau. 24 May 2006 ICESat/GLAS: Release-26 data for the Laser 2A time period (25 September to 18 November 2003) are available for the following products: GLA01 - GLA15. See ICESat/GLAS Data Releases for more information. 4 May 2006 ICESat/GLAS: Release-26 data for the Laser 2B time period (17 February to 21 March 2004) are available for the following products: GLA01 - GLA015. See ICESat/GLAS Data Releases for more information. 10 March 2006 Repeat Photography of Glaciers: This collection matches photos of glaciers taken as early as the 1890s with recent photos taken at the same physical location. The photos tell a captivating visual story of the changes glaciers have experienced through time. 17 March 2006 ICESat/GLAS: Release-26 data are available for the following products: GLA01 - GLA09 and GLA12 - GLA015. This release covers the Laser 3D time period (21 October to 24 November 2005). Significant changes to the altimetry products include a range correction for saturation and several changes to the alternate fit waveforms. Several new MET parameters were added to the atmospheric products. See ICESat/GLAS Data Releases for more information. 14 February 2006 Northern Hemisphere Seasonal and Intermittent Frozen Ground Areas 1901-2000: This FGDC data set contains monthly values of the total exposed land area of seasonally frozen ground and annual values for intermittently frozen ground in the Northern Hemisphere. Seasonally frozen ground is defined as the near-surface soil that experiences freeze for more than 15 days per year, while intermittently frozen ground experiences fewer than 15 days of freeze per year. 13 February 2006 Cloud-Radiation Feedback: Boundary Layer Cloud Microphysical Properties and Processes: This ADCC data set contains Surface Heat Budget of the Arctic (SHEBA) cloud microphysical data collected onboard the National Center for Atmospheric Research (NCAR) C-130 aircraft. 13 February 2006 Compilation of Antarctic Radar Data, Siple Coast, 2000-2002: This AGDC data set contains ground-based, ice-penetrating radar profiles across satellite-detected lineations and terrains that were taken in the lower reaches of Ross Ice Stream C, also known as the Kamb Ice Stream (KIS); on Roosevelt Island; on the Siple Dome; and on the Shabtaie Ice Ridge. 13 February 2006 SMEX02 Land Surface Information: Soils Database: This Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E) data set includes ESRI shapefiles containing geographic information such as railroads, roads, and stream locations; drainage features; political boundaries; and soil classifications for 10 Iowa counties. 7 February 2006 Arctic EASE-Grid Freeze and Thaw Depths, 1901 - 2002: This FGDC data set contains mean, median, minimum and maximum freeze and thaw depths for each year from 1901 to 2002 on the 25 km EASE-Grid for areas north of 50°. Freeze and thaw depths are estimated using a variant of the Stefan solution that uses an edaphic factor and freezing or thawing indices as inputs. 6 January 2006 Timing and Statistics of Autumn and Spring Annual Snow Cover for the Northern Hemisphere: This NOAA data set includes the timing of snow cover onset in the fall, the timing of last observed snow cover in the spring and the snow-free duration from 1972 to 2000. 6 January 2006 The Dehn Collection of Arctic Sea Ice Charts, (1953-1986): This NOAA data set includes almost 4,000 charts that have been scanned and are now available online. A search and order interface allows users to submit orders for high-resolution TIFF images. |
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