Moist Static Energy as an Indicator of South Asian Summer Monsoon Dynamics

Thursday, 18 December 2014
Anthony Louis D'Agostino, Columbia University of New York, School of International and Public Affairs, New York, NY, United States and Ron L Miller, NASA/GISS, New York, NY, United States
In a monsoon climate, moist static energy (MSE) indicates air mass origin, while complementing precipitation as an indicator of monsoon onset (or retreat). Here, MSE from daily-resolution Coupled Model Intercomparison Project Phase 5 (CMIP5) general circulation models is used to characterize the onset, duration, and retreat of the South Asian Summer Monsoon. We examine results from multiple representative concentration pathways (RCP 4.5, RCP 8.5), as well as an abrupt 4x of CO2 scenario, to identify how changes in radiative forcing impact MSE and its relation to the monsoon. We discuss results in light of earlier work examining MSE as an indicator for the Sahelian monsoon.