Trimodal cloudiness and tropical stable layers in simulations of radiative convective equilibrium

Details Trimodal cloudiness and tropical stable layers in simulations of radiative convective equilibrium Trimodal cloudiness and tropical stable layers in simulations of radiative convective equilibrium

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3508802p&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 8, CiteID L08802

Physics

4

Atmospheric Processes: Clouds And Cloud Feedbacks, Atmospheric Processes: Convective Processes, Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Radiative Processes, Atmospheric Processes: Tropical Meteorology

Scientific paper

In this paper, we examine the tropical environment at radiative convective equilibrium using a large-domain cloud system resolving numerical model. As in observed studies of convectively active periods over warm tropical oceans (in particular the tropical western Pacific), we find a trimodal cloud structure that is closely associated with the presence of three distinct stable layers, including a prominent stable layer located near the zero-degree Celsius level. In addition, the simulation exhibits three separate large scale zonal overturning circulations, with two of these circulations located above the trade wind inversion and separated by the freezing level stable layer. At equilibrium, latent heat release associated with freezing and melting processes is dwarfed by that of vapor transitions, and simulation results suggest that this stable layer can be maintained by subsidence in the presence of longwave radiative cooling above the zero-degree level.

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