The seasonal variation of Tibetan Convective Systems: Satellite observation

被引：54

作者：

Hu, Liang ^{[1
,2
]}

Deng, Difei ^{[3
]}

Gao, Shouting ^{[3
]}

Xu, Xiangde ^{[1
]}

机构：

[1] Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China

[2] Chinese Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing, Peoples R China

[3] Chinese Acad Sci, Inst Atmospher Phys, Beijing, Peoples R China

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2016年 / 121卷 / 10期

基金：

中国国家自然科学基金;

关键词：

PRECIPITATION; PLATEAU; CLOUDS; TRMM;

D O I：

10.1002/2015JD024390

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Based on International Satellite Cloud Climatology Project (ISCCP) Convection Tracking Database (CTD) data set, a new definition for the Tibetan Convective System (TCS) is introduced, in which the effects of cirrus and cirrostratus are excluded from the TCS over this region. 2032 TCSs are selected to study their seasonal variations in initiation, frequency, spatial distribution, life cycle, cloud physics, precipitation, and dynamic and thermodynamic characteristics. It is found that the number of TCSs varies seasonally, with the maximum in July and minimumin December. The 10%, 8%, 9%, and 73% TCSs are originated from Tibetan shear, vortex, low, and the rest, respectively. TCSs play an important role in the precipitation of the Tibetan Plateau and its adjacent regions. Even in winter, the rainfall of TCS contributes up to 70% of the total precipitation over the central-eastern Tibetan Plateau and 30%-70% over Sichuan basin and upper-middle segment of Yangtze River basin. The seasonal changes of TCSs' cloud properties from ISCCP indicate that the strongest TCSs happen in summer and the weakest in winter, which are consistent with the seasonal variation of TCSs' rainfall observed by TRMM. Besides, TCSs show an asymmetric dynamic and thermodynamic distribution, especially in summer.

引用

页码：5512 / 5525

页数：14

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