The following are examples of natural events that add carbon dioxide to the atmosphere:

Human activities (such as the following) also add carbon dioxide to the atmosphere:

LLNL Climate and Carbon Science Mission

In keeping with its mission to "enhance the energy and environmental security of the nation" LLNL promotes the many climate and carbon science research and development efforts that are described on these pages. These efforts involve teams of both environmental and computer scientists, as well as diverse support personnel, who work together to achieve scientific and technical innovations directed toward pressing national and international problems in these fields.

Climate and Carbon Science Projects

1. Climate model projections of the global temperature increase associated with different 21st century scenarios of greenhouse-gas emissions. [From 2007 IPCC WG1 Report, Cambridge Univ. Press.]

2. Depictions of surface and atmospheric temperature increases for years 2050 and 2100, based on the consensus of coupled ocean-atmosphere climate model simulations.

3. Examples of different types of graphical displays produced by the open-source Climate Data and Analysis Tools (CDAT).

4. Global-average differences between coupled ocean-atmosphere simulations of various climate variables and respective observations, represented as a color-coded plot.

5. Computer simulated changes in Earth’s surface temperatures and sea ice extents for past and future years.

6. Graphical depictions of 1980-1990 surface temperature and of the cloud structure at different atmospheric altitudes, as simulated by the Community Climate System Model.

7. The global carbon cycle (Gigatons of carbon per year), estimated natural fluxes shown in black, anthropogenic fluxes in red. [From Fig.7.3 of the 2007 IPCC WG1 Report, Cambridge Univ. Press.]

8. Average atmospheric temperature change from 1900-2100 simulated by the collection of CMIP climate models.

9. Elevations of the Western U.S. (color shading), with mountainous regions, where climate change is attributable to human activities, indicated by colored circles.

10. Surface temperatures and pressures accompanying West Pacific typhoons simulated by a fine-resolution climate model.

11. Cosmic ray carbon-14 is transported to surface as shown by this 3D surface of constant carbon-14 concentration from our global atmospheric chemistry model.

12. Relative humidity (%) at an Atmospheric Radiation Measurement (ARM) site in northern Oklahoma 1997/06; a) ARM obs., b) ERA-40 reanalysis, c) Community Atmosphere Model (CAM2) forecasts.

  • 1. Model projections
  • 2. Temperature increase
  • 3. CDAT graphics
  • 4. Models comparison
  • 5. Earths temperature
  • 6. Cloud structure
  • 7. Carbon cycle
  • 8. Temperature changes
  • 9. Regional model
  • 10. Typhoon simulation
  • 11. Carbon-14 tracer
  • 12. RH at ARM



LLNL Climate Modeling Scientific Focus Area Triennial Review - Agenda, Presentations and Posters, September 5-6, 2012