Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 124, Issue 23, Pages 12380-12403Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019JD030943
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Funding
- National Science Foundation (NSF)
- National Center for Atmospheric Research - NSF [1852977]
- NASA
- project Effects of the Pinatubo Eruption on Climate by Japan Science and Technology Agency
- project Studies of the Effects of Stratospheric Variations on Climate by Japan Science and Technology Agency
- Greenhouse gases Observation SATellite project
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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 describes WACCM6 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 in WACCM6, relative to WACCM4. In addition, there are improvements in high-latitude climate variability at the surface and sea ice extent in WACCM6 over the lower top version of the model (CAM6) that comes from the extended vertical domain and expanded aerosol chemistry in WACCM6, highlighting the importance of the stratosphere and tropospheric chemistry for high-latitude climate variability.
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