TheWhole Atmosphere Community ClimateModel Version 6 (WACCM6)

摘要

The Whole Atmosphere Community Climate Model version 6 (WACCM6) is a major update of the whole atmosphere modeling capability in the Community Earth System Model (CESM), featuring enhanced physical, chemical and aerosol parameterizations. This work describesWACCM6 and some of the important features of the model.WACCM6 can reproduce many modes of variability and trends in the middle atmosphere, including the quasi-biennial oscillation, stratospheric sudden warmings, and the evolution of Southern Hemisphere springtime ozone depletion over the twentieth century.WACCM6 can also reproduce the climate and temperature trends of the 20th century throughout the atmospheric column. The representation of the climate has improved inWACCM6, relative toWACCM4. In addition, there are improvements in high-latitude climate variability at the surface and sea ice extent inWACCM6 over the lower top version of the model (CAM6) that comes from the extended vertical domain and expanded aerosol chemistry inWACCM6, highlighting the importance of the stratosphere and tropospheric chemistry for high-latitude climate variability.