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heat and moisture budgets during the Period of HUBEX/GAME in the Summer of 1998

Advances in Atmospheric Sciences 2003年第2期20卷 245-252页

作者：彭京备宋正山 Institute of Atmospheric Physics Chinese Academy of Sciences

By using the high-resolution GAME reanalysis data, the heat and moisture budgets during the period of HUBEX/GAME in the summer of 1998 are calculated for exploring the thermodynamic features of Meiyu over the Changjiang-Huaihe (CH) valley. During the CH Meiyu period, an intensive vertically-integrated heat source and moisture sink are predominant over the heavy rainfall area of the CH valley, accompanied by strong upward motion at 500 hPa. The heat and moisture budgets show that the main diabatic heating component is condensation latent heat released by rainfall. As residual terms, the evaporation and sensible heating are relatively small. Based on the vertical distribution of the heat source and moisture sink, the nature of the rainfall is mixed, in which the convective rainfall is dominant with a considerable percentage of continuous stratiform rainfall. There are similar time evolutions of the main physical parameters (〈Q 1〉, 〈Q 2〉, and vertical motion ω at 500 hPa). The time variations of 〈Q 1〉 and 〈Q 2〉 are in phase with those of −ω 500, and have their main peaks within the CH Meiyu period. This shows the influence of the heat source on the dynamic structure of the atmosphere. The wavelet analyses of those time series display similar multiple timescale characteristics. During the CH Meiyu period, both the synoptic scale(∼6 days) and mesoscale (∼2 days and ∼12 hours) increase obviously and cause heavy rainfall as well as the appearances of the maxima of the main physical parameters. Among them, the mesoscale systems are the main factors.

关键词： heat and moisture budgets Meiyu the Changjiang-Huaihe valley HUBEX multiple timescale

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