AOSC Departmental Seminar
October 1, 2015

From Tropical Storms to Decadal Prediction: GEOS-5 AGCM Physical Parameterizations for a Wide Range of Applications and Resolutions

Andrea Molod

The Modern-Era Retrospective Analysis for Research and Applications-2 (MERRA2) version of the Goddard Earth Observing System - 5 (GEOS-5) Atmospheric General Circulation Model (AGCM) is currently in use in the NASA Global Modeling and Assimilation Office (GMAO) at a wide range of resolutions for a variety of applications. Examples of important changes in parameterizations targeted for specific applications are presented. The resulting improvements in the simulation of tropical cyclones, forecast skill score, and global teleconnection patterns are described. In addition, the development of "resolution aware" behavior related to the moist physics, designed to ensure seamless behavior across different resolutions and applications is described and improvements in GEOS-5 AGCM behavior at high resolution is analyzed. Some issues related to the resolution aware behavior for constituent transport are also presented, along with current work and future plans to improve this behavior and the GEOS-5 AGCM at ultra high resolution.