云南雨季开始期与5月雨量的TBB特征  

TBB Features of Yunnan Rainy Season Onset and May Rainfall

作　　者：解明恩[1] 鲁亚斌[1] 程建刚[1] 郭荣芬[1] 

机构地区：[1]云南省气象局

出　　处：《高原气象》2006年第2期319-324,共6页Plateau Meteorology

基　　金：云南省自然科学基金重点项目"云南重大气候灾害形成机理研究"(2003D0014Z)资助

摘　　要：利用17年卫星TBB及云南雨量资料,研究了热带TBB演变与云南雨季开始期及5月雨量的关系。结果表明:当孟加拉湾至中南半岛上空TBB≤-10℃的主对流云云涌稳定通过20°N,TBB≤-20℃强对流区北移到18°N附近,而且TBB≤-5℃区稳定控制云南时,云南大部分地区雨季开始。云南5月少雨年,孟加拉湾至中南半岛上空TBB≤-10℃位置偏南且为正距平区控制,云南为TBB正距平区,对流活动偏弱;云南5月多雨年,上述地区的TBB场分布特征则反之。同时还提出了利用TBB资料跟踪预测云南雨季开始期的方法。Using 17-year TBB data and monthly precipitation data in Yunnan, the relations between tropical regional TBB evolution and rainy season onset date and May rainfall in Yunnan are studied. The results show that rainy season onset in most of Yunnan when the north boundary with TBB≤- 10℃, the major convective cloud tide over Bay of Bengal and Indochina Peninsula, has passed steadily northward 20° N, the one with TBB≤-20℃ , the strong convective area, has moved northward near 18°N, and the one with TBB≤-5℃, the convective area, has already covered Yunnan. If the location of TBB≤-10℃ convective cloud tide over the Bay of Bengal and the Indochina Peninsula is something southward than normal and TBB distribution shows positive anomaly pattern over the Bay of Bengal and the Indochina Peninsula and Yunnan in May, then the May of the year is the less precipitation years in Yunnan, the convective activities in these areas is weaker. And more rain May in Yunnan vice versa. At last, the way of observing and forecasting Yunnan rainy season onset are obtained by using tropical TBB data.

关 键 词：卫星TBB资料 云南雨季开始期 夏季风 对流活动 

分 类 号：P426.613[天文地球—大气科学及气象学]