3.4 Impacts of CAM5 Cloud Microphysics on Arctic clouds and radiation

Monday, 29 April 2013: 2:30 PM
South Room (Renaissance Seattle Hotel)
Jason M. English, CIRES/Univ. of Colorado, Boulder, CO; and J. Kay and A. Gettelman

Arctic cloud processes are complex and climate models typically struggle to accurately represent cloud amount, water phase, and the corresponding radiative fluxes. We conduct a thorough examination of Arctic cloud processes in the CAM5 model, which contains 2-moment liquid and ice cloud microphysics. Simulations with the base model and with an improved mixed-phase ice nucleation scheme at 1 degree horizontal resolution are studied. Arctic cloud properties and radiative fluxes are compared for the two simulations and with basin-wide satellite observations and local surface observations. Suggestions for model improvement are highlighted.
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