摘要
通过对46年（1961—2006年）的初夏（4月21日-5月31日）孟加拉湾低压的研究,发现影响云南雨季开始期的初夏孟加拉湾低压系统源地大致位于9°-12°N,88°-91°E之间,较强的低压系统从源地移出后分别沿着两条路径影响云南,这两条路径对应着不同强弱的南亚高压环流。初夏孟加拉湾低压出现频率与云南雨季开始早晚有明显的负相关关系。前期3月中南半岛附近海域的对流强（弱）,则有（不）利于初夏孟加拉湾地区产生低压系统。初夏孟加拉湾低压与前期南印度洋海温呈负相关,当南印度洋海温下降（上升）时,有（不）利于孟加拉湾地区对流加强、低压系统生成。
The lows over the Bay of Bengal in early summer（April 21-May 31） from 1961 to 2006 were studied,which usually affect the beginning time of the rainy season in Yunnan.The result shows that the lows are roughly originated from the ranges of 9°～12°N and 88°～91°E.After starting out from the source,the lows affected Yunnan Province through two paths which correspond to the strong or weak South Asia high,respectively.There is a significant negative correlation between the frequencies of the lows and the beginning time of the rainy season in Yunnan,if the convection activity in the prior March near the Indochina Peninsula is strong（weak）,it will be advantageous（disadvantageous） to establishment of the low system.A negative correlation also shows between the lows over the Bay of Bengal in early summer and the prior SST near the southern Indian Ocean,if the SST decreases（increases）,it is（is not） helpful to develop the convection activity and to form the low system.
出处
《高原气象》
CSCD
北大核心
2007年第3期572-578,共7页
Plateau Meteorology
基金
中国气象局气象新技术推广项目(CMATG2006M45)
中国气象局成都高原气象研究所基金项目(LPM2006015)共同资助
关键词
云南
雨季
孟加拉湾低压
Yunnan Province
Rainy season
Lows over the Bay of Bengal
