Analyses of hot and humid weather in Beijing city in summer and its dynamical identification

The circulation, hygrothermal property and moisture transport character of typical hot and humid weather were analyzed in Beijing areas from July 30 to August 4, 2002. It was pointed out that, under the control of subtropical anticyclone which stretches to the west and north, downdraft suppresses the lifting of lower-troposphere moisture, which makes moisture keep in the lower troposphere. That is the direct reason causing hot and humid weather. Considering the non-uniformity saturated character in real atmosphere, generalized moist potential vorticity (GMPV) equation is derived by the introduction of generalized moist potential temperature concept. The analysis of GMPV shows that negative GMPV anomaly occurs in the lower troposphere. It has indicative sense to hot and humid weather. Thus, the GMPV anomaly can be utilized to identify this kind of weather and to make a short-term prediction.

作 者： GAO Shouting ZHOU Yushu LEI Ting SUN Jianhua   作者單位： Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China  刊 名： 中國科學(xué)D輯（英文版）  SCI 英文刊名： SCIENCE IN CHINA SERIES D(EARTH SCIENCES)  年，卷(期)： 2005 48(z2)  分類號： P4  關(guān)鍵詞： hot and humid weather   generalized moist potential vorticity   dynamical identification  

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