Dependence of Convectively Coupled Gravity Waves on Convective Representation

Thursday, 21 April 2016: 8:45 AM
Ponce de Leon B (The Condado Hilton Plaza)
I-Kuan Hu, Univ. of Miami/RSMAS, Miami, FL; and S. Song and B. E. Mapes

This study investigates the effects of selected parameters in either a single-column model or a cloud-resolving model on simulated convectively coupled gravity waves (CCGWs). All simulations are conducted within an idealized framework, in which the time-independent radiative forcing is prescribed and the large-scale dynamics are parameterized with the damped gravity wave method in a nonrotating atmospheric column. In the single-column model (single-column Community Atmosphere Model) simulations, experiments using various parameter values associated with the efficiency of convective adjustment, the sensitivity to the environmental moisture, and the shape of the heating profile are implemented. Furthermore, a multi-plume version of the University of Washington shallow convection scheme, which is designed to unify shallow and deep convection, is evaluated. In the cloud-resolving model (System for Atmospheric Modeling, SAM) simulations, an additional parameter controlling the ratio of horizontal resolution to horizontal domain size is explored. The linear convective response function from SAM built by Kuang is also used to better interpret the effects of specific processes, such as mid-level pre-moistening by congestus clouds, on CCGWs.
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