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《Chinese Journal of Atmospheric Sciences》 2007-05
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Preliminary Analysis on Seasonal Variation of Deep Convective Clouds and Its Association with the Tropopause in East Asia

WANG Min-Yan1,2,3 and L Da-Ren11 Laboratory for Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000292 Graduate University of Chinese Academy of Sciences,Beijing 1000493 National Meteorological Information Center,China Meteorological Administration,Beijing 100081  
An algorithm to detect "high,thick,dense" Deep Convective Clouds(DCCs) is applied in this paper,which makes use of the difference between the infrared channel(10.5-11.5μm) and water vapor channel(6.5-7.0 μm) of VISSR(Visible and Infrared Spin Span Radiometer) on board of GMS 5 and combines with infrared threshold method and segment smoothing filtering algorithm.The seasonal variations of DCCs top temperature and its occurrence frequency in several sub-regions of East Asia are that there are one peak and one dip in a year.DCCs top temperature is lower in summer than in winter in different sub-regions but the reasons are distinct.To the north of 36°N,DCCs are more frequent in winter than in summer,while in the south,the reverse is true.From winter,spring to summer,autumn,tropopause pressure decreases with ascending tropopause height,while tropopause temperature has a pattern of "warmer in summer-colder in winter" to the north of 45°N and it is reverse to the south.In the focused study areas,DCCs and tropopause keep the similar phase of seasonal variation.In 2000,the correlation of seasonal variations between DCCs top temperature and tropopause temperature reaches 0.757,and the correlation of seasonal variations between DCCs top temperature and tropopause pressure is 0.901.Tropopause temperature is 9.42℃,which is lower than DCCs top temperature averagely.Obviously,deep convective activities are restrained strongly by tropopause.
【Fund】: 国家自然科学基金资助项目40333034;; 科技部基础预研专项2001CCA02200
【CateGory Index】: P426.5
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1 ZHENG YongGuang1, CHEN Jiong1, CHEN MingXuan2, WANG YingChun2 & DING QingLan3 1 National Meteorological Center, Beijing 100081, China; 2 Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China; 3 Beijing Meterological Office, Beijing 100089, China;Statistic characteristics and weather significance of infrared TBB during May―August in Beijing and its vicinity[J];科学通报(英文版);2007-24
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