A22A-01
On the assumed PDF method for climate simulations
Tuesday, 15 December 2015: 10:20
3010 (Moscone West)
Peter Bogenschutz1, Andrew Gettelman1, Vincent E Larson2, Chih-Chieh Chen1, Katherine Thayer-Calder3, Hugh Morrison1, Steven K Krueger4 and Cheryl Craig1, (1)National Center for Atmospheric Research, Boulder, CO, United States, (2)Univ Wisconsin-Milwaukee, Milwaukee, WI, United States, (3)University of Wisconsin Milwaukee, Milwaukee, WI, United States, (4)Univ of Utah-Meteorology, Salt Lake City, UT, United States
Abstract:
The last several years has seen the emergence of the so-called “assumed PDF” approach, serving as a unified parameterization between convective and stratiform cloud, for general circulation models (GCMs). These parameterizations are centered around a trivariate assumed double Gaussian distribution to close sub-grid scale turbulence and clouds. This presentation will focus on the successes and challenges on the first generation of models that have implemented this type of approach. This includes a variety of model types at a range of scales, including cloud resolving models, super-parameterized GCMs, and conventionally parameterized GCMs. Implications of the assumed PDF method on scales ranging from short-term cloud processes, intra-annual seasonal tropical variability, and to longer range coupled modes of variability will be explored.
