Abstract
This paper presents the results of several global experiments that were carried out to study the formation of a surge vortex. This vortex formed over the South China Sea during the Winter Monsoon season. The numerical experiments explore the sensitivity of the prediction to horizontal and vertical resolution, to the use of high resolution cloud winds, and to two different representations of orography. The results of these studies show that the simulation of the surge vortex was only possible at a minimal horizontal resolution of 42 waves (triangular), 11 vertical levels and the use of envelope orography. The results did not appear to be sensitive to the inclusion of high resolution cloud winds. A major synoptic aspect of this study deals with the interaction of westward propagating easterly waves and the quasi-stationary cold surge over the South China Sea. That aspect of the cyclogenesis was shown observationally as well as via the numerical weather prediction experiment. That interaction appears to be quite sensitve to the inclusion of steep orography.
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Schedule a callMore From: Journal of the Meteorological Society of Japan. Ser. II
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