CAM-chem: description and evaluation of interactive atmospheric chemistry in the Community Earth System Model

Abstract. We discuss and evaluate the representation of atmospheric chemistry in the global Community Atmosphere Model (CAM) version 4, the atmospheric component of the Community Earth System Model (CESM). We present a variety of configurations for the representation of tropospheric and stratospheric chemistry, wet removal, and online and offline meteorology. Results from simulations illustrating these configurations are compared with surface, aircraft and satellite observations. Major biases include a negative bias in the high-latitude CO distribution, a positive bias in upper-tropospheric/lower-stratospheric ozone, and a positive bias in summertime surface ozone (over the United States and Europe). The…

• NS
  National Science Foundation

  Awards: 0929282, 0840825
• UD
  U.S. Department of Energy
• NC
  National Center for Atmospheric Research
• UC
  University Corporation for Atmospheric Research
• NO
  National Oceanic and Atmospheric Administration
• OO
  Office of Science