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contributor authorMajda, Andrew J.
contributor authorKhouider, Boualem
contributor authorKiladis, George N.
contributor authorStraub, Katherine H.
contributor authorShefter, Michael G.
date accessioned2017-06-09T14:38:55Z
date available2017-06-09T14:38:55Z
date copyright2004/09/01
date issued2004
identifier issn0022-4928
identifier otherams-23544.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4160117
description abstractRecent observational analysis of both individual realizations and statistical ensembles identifies moist convectively coupled Kelvin waves in the Tropics with supercluster envelopes of convection. This observational analysis elucidates several key features of these waves including their propagation speed of roughly 15 m s?1 and many aspects of their dynamical structure. This structure includes anomalously cold temperatures in the lower troposphere and warm temperatures in the upper troposphere (below 250 hPa) within and sometimes leading the heating region and strong updrafts in the wave, and an upward and westward tilting structure with height below roughly 250 hPa. Other key features in the wave are that anomalous increases in convective available potential energy (CAPE) and surface precipitation lead the wave while the trailing part of the supercluster is dominated by stratiform precipitation. The main result in this paper is the development of a simple model convective parameterization with nonlinear convectively coupled moist gravity waves, which reproduce many of the features of the observational record listed above in a qualitative fashion. One key feature of the model convective parameterization is the systematic use of two vertical modes with one representing deep convective heating and the other stratiform heating. The other key feature in the model is the explicit parameterization of the separate deep convective and stratiform contribution to the downdrafts, which change equivalent potential temperature in the boundary layer. The effects of rotation on convectively coupled equatorial waves are also included through a suitable linear stability theory for the model convective parameterization about radiative convective equilibrium.
publisherAmerican Meteorological Society
titleA Model for Convectively Coupled Tropical Waves: Nonlinearity, Rotation, and Comparison with Observations
typeJournal Paper
journal volume61
journal issue17
journal titleJournal of the Atmospheric Sciences
identifier doi10.1175/1520-0469(2004)061<2188:AMFCCT>2.0.CO;2
journal fristpage2188
journal lastpage2205
treeJournal of the Atmospheric Sciences:;2004:;Volume( 061 ):;issue: 017
contenttypeFulltext


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