U.S. Department of Energy Office of Biological and Environmental Research

BER Research Highlights


Using Models to Identify the Role of Climate and Atmospheric Composition on Changes in the Lower Stratosphere
Published: July 14, 2008
Posted: July 23, 2008

Department of Energy (DOE)-funded scientists have shown that the Community Atmosphere Model Version 3 (CAM3) can reproduce a variety of large-scale changes observed in climate and chemical composition in the stratosphere when forced with the observed sea-surface temperatures and surface concentrations of long-lived trace gases and ozone-depleting substances. They also used the same model to differentiate the role of chemically active composition (ozone, methane, and chlorofluorocarbons) and CO2 observed trends in the stratosphere. The simulations indicate that changes in CO2 do not change the total ozone trend; however, CO2 changes do lead to important differences in ozone in the upper part of the stratosphere. In contrast, changes in surface methane concentration drive changes in the globally averaged total ozone column through changes in tropospheric and stratospheric ozone columns.The model is capable of reproducing trends in the age of tropical air that were found in other studies and suggests that the relation between the upward velocity and mean age of tropical air breaks down in the upper stratosphere, above 20 hPa, in association with isentropic mixing above that level. These simulations suggest that keeping methane and ozone-depleting substances at their 1970 levels would have a significant impact, indicating the potential importance of controlling methane emissions.

Reference: Lamarque J.-F., D.E. Kinnison, P.G. Hess, and F.M. Vitt. 2008. "Simulated lower stratospheric trends between 1970 and 2005: Identifying the role of climate and composition changes," J. Geophys. Res. 113 D12301, DOI:10.1029/2007JD009277

Contact: Anjuli Bamzai, SC-23.1, (301) 903-0294
Topic Areas:

  • Research Area: Earth and Environmental Systems Modeling
  • Research Area: Atmospheric System Research

Division: SC-23.2 Biological Systems Science Division, BER
      (formerly SC-23.1 Life Sciences Division, OBER)

 

BER supports basic research and scientific user facilities to advance DOE missions in energy and environment. More about BER

Recent Highlights

Aug 24, 2019
New Approach for Studying How Microbes Influence Their Environment
A diverse group of scientists suggests a common framework and targeting of known microbial processes [more...]

Aug 08, 2019
Nutrient-Hungry Peatland Microbes Reduce Carbon Loss Under Warmer Conditions
Enzyme production in peatlands reduces carbon lost to respiration under future high temperatures. [more...]

Aug 05, 2019
Amazon Forest Response to CO2 Fertilization Dependent on Plant Phosphorus Acquisition
AmazonFACE Model Intercomparison. The Science Plant growth is dependent on the availabi [more...]

Jul 29, 2019
A Slippery Slope: Soil Carbon Destabilization
Carbon gain or loss depends on the balance between competing biological, chemical, and physical reac [more...]

Jul 15, 2019
Field Evaluation of Gas Analyzers for Measuring Ecosystem Fluxes
How gas analyzer type and correction method impact measured fluxes. The Science A side- [more...]

List all highlights (possible long download time)