Simulations of tropical sub-seasonal variability in the idealized aqua-planet AGCMs

Details Simulations of tropical sub-seasonal variability in the idealized aqua-planet AGCMs Simulations of tropical sub-seasonal variability in the idealized aqua-planet AGCMs

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.a23c..04l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #A23C-04

Other

3310 Clouds And Cloud Feedbacks, 3337 Global Climate Models (1626, 4928), 3339 Ocean/Atmosphere Interactions (0312, 4504)

Scientific paper

The characteristics of the simulated tropical sub-seasonal variability (15-90days) in four atmospheric general circulation models (AGCMs) were compared in a simplified aqua-planet framework. The investigated models are the NASA/NSIPP, GFDL/AM2, SNU/SNUGCM and NASA/GEOS5 AGCMs. The experiment uses the same configuration as the Aqua-Planet Experiment (APE) proposed by Neale and Hoskins (2001), but with a simple mixed layer ocean of finite heat capacity at the lower boundary, which enables air-sea interaction processes. Although, as in the observation, the dominant tropical rainfall variability simulated by all the models consists of low-frequency eastward propagation signals, their amplitudes and speeds are quite different among the models. Two AGCMs (NSIPP and SNU) are characterized by small amplitude of sub-seasonal variances with fast propagation of convectively coupled equatorial waves, whereas the other two AGCMs (AM2 and GEOS5) are characterized by large amplitude of variances and much slower propagation of equatorial waves. Subsequent analysis and sensitivity experiments suggested that these differences are largely explained by the "Tokioka" modification in their Relaxed Arakawa-Schubert (RAS) convection scheme used in the latter models, which tends to suppress the parameterized convection and enhances the rainfall variability from grid- scale condensation process. The vertical distribution of diabatic heating, clouds, and surface fluxes are further analyzed to examine the structure of propagating waves and the role of air-sea interaction and of cloud- radiation feedback.

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