Theoretical and Applied Mechanics Japan
Online ISSN : 1349-4244
Print ISSN : 1348-0693
ISSN-L : 1348-0693
III. HEAT TRANSFER AND FLUID DYNAMICS
A Resolution Dependence of Equatorial Precipitation Activities Represented in a General Circulation Model
Yukiko YAMADATakeaki SAMPEYoshiyuki O. TAKAHASHIMayumi K. YOSHIOKAWataru OHFUCHIMasaki ISHIWATARIKensuke NAKAJIMAYoshi-Yuki HAYASHI
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2005 Volume 54 Pages 289-297

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Abstract

An aqua planet experiment is performed to investigate dependence of the model representation of the equatorial precipitation activities on horizontal and vertical resolution. The numerical model utilized is AFES, an AGCM optimized for the Earth Simulator. With a resolution of horizontal truncation at T39 and 48 vertical levels (referred to as the standard run), there appear precipitation disturbances of the scale of several grids, which are advected westward by the background wind. With the increase of the vertical resolution to 96 levels from the standard run, precipitation tends to have weak intensity but be widely distributed, and the westward propagating grid-scale disturbances are rarely observed. With the increase of the horizontal resolution to T159 from the standard run, a hierarchical structure appears. A large-scale eastward moving precipitation structure is superimposed on a small-scale westward moving structure.

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© 2005 by National Committee for IUTAM
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