Climate Change from 1850 to 2005 Simulated in CESM1(WACCM)

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Marsh, Daniel R.
Mills, Michael J.
Kinnison, Douglas E.
Lamarque, Jean-François
Polvani, Lorenzo M.
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American Meteorological Society
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The NCAR Community Earth System Model (CESM) now includes an atmospheric component that extends in altitude to the lower thermosphere. This atmospheric model, known as the Whole Atmosphere Community Climate Model (WACCM), includes fully interactive chemistry, allowing, for example, a self-consistent representation of the development and recovery of the stratospheric ozone hole and its effect on the troposphere. This paper focuses on analysis of an ensemble of transient simulations using CESM1(WACCM), covering the period from the preindustrial era to present day, conducted as part of phase 5 of the Coupled Model Intercomparison Project. Variability in the stratosphere, such as that associated with stratospheric sudden warmings and the development of the ozone hole, is in good agreement with observations. The signals of these phenomena propagate into the troposphere, influencing near-surface winds, precipitation rates, and the extent of sea ice. In comparison of tropospheric climate change predictions with those from a version of CESM that does not fully resolve the stratosphere, the global-mean temperature trends are indistinguishable. However, systematic differences do exist in other climate variables, particularly in the extratropics. The magnitude of the difference can be as large as the climate change response itself. This indicates that the representation of stratosphere-troposphere coupling could be a major source of uncertainty in climate change projections in CESM.
© 2013 American Meteorological Society. We thank Rolando Garcia, Marianna Vertenstein, Christopher Fischer, Francis Vitt, and Fabrizio Sassi for assistance in developing CESM1 (WACCM) and interpreting its output. We also thank Edwin Gerber for discussions on deriving a simplified NAM index and Rich Neale and David Barriopedro for advice on the calculation of blocking frequency. The CESM project is supported by the National Science Foundation and the Office of Science (BER) of the U.S. Department of Energy. Computing resources were provided by the Climate Simulation Laboratory at NCAR's Computational and Information Systems Laboratory (CISL), sponsored by the National Science Foundation and other agencies. This research was enabled by CISL compute and storage resources. Bluefire, a 4064-processor IBM Power6 resource with a peak of 77 TeraFLOPS, provided more than 7.5 million computing hours, the GLADE high-speed disk resources provided 0.4 PetaBytes of dedicated disk, and CISL's 12-PB HPSS archive provided over 1 PetaByte of storage in support of this research project. LMP is supported in part by a grant from the U.S. National Science Foundation to Columbia University. The National Center for Atmospheric Research is sponsored by the National Science Foundation.
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