A Resolution Dependence of Equatorial Precipitation Activities Represented in a General Circulation Model

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 a...

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Bibliographic Details
Published in:Theoretical and Applied Mechanics Japan 2005, Vol.54, pp.289-297
Main Authors: YAMADA, Yukiko, SAMPE, Takeaki, TAKAHASHI, Yoshiyuki O., YOSHIOKA, Mayumi K., OHFUCHI, Wataru, ISHIWATARI, Masaki, NAKAJIMA, Kensuke, HAYASHI, Yoshi-Yuki
Format: Article
Language:English
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Summary: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.
ISSN:1348-0693
1349-4244
DOI:10.11345/nctam.54.289