盛夏南亚高压位置异常与重庆降水气温的联系  

Diagnosis of Relationships Between the South Asia High and Drought and Flood in Midsummer in Chongqing

作　　者：周浩[1] 程炳岩[1] 康俊[1] 

机构地区：[1]重庆市气候中心,重庆401147

出　　处：《西南大学学报（自然科学版）》2014年第7期110-116,共7页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(40975058);重庆自然科学基金项目"三峡库区极端气候事件预估研究";重庆市气象局青年基金项目"南亚高压异常活动对夏季重庆地区极端干旱的影响研究"(QNJJ-201101)

摘　　要：利用近51年(1961-2011年)南亚高压特征指数和重庆地区34个地面观测站盛夏(7-8月)降水量、气温资料对它们之间的联系进行了分析.研究发现,南亚高压的南北位置变化与重庆地区盛夏期间降水、气温存在显著的负、正相关关系.盛夏,当南亚高压位置偏北时,重庆地区降水偏少,气温偏高,出现异常干旱;当南亚高压位置偏南时,重庆地区降水偏多,气温偏低,出现洪涝灾害的可能性较大.同时还发现,南亚高压南北位置异常年份东亚地区大气环流具有典型的重庆异常降水年份的特征,表明南亚高压与东亚地区大气环流的异常有着紧密联系,并通过环流的异常影响重庆盛夏降水和气温的变化.Based on the monthly South Asia High （SAH） indexes in midsummer and observed meteorologi cal data （rainfall and temperature） in July and August during 1961--2011 at 34 meteorological stations, the relationships between them is studied. The results indicate that the ridge of SAH is significantly corre lated with rainfall and temperature in midsummer of Chongqing. When it is located north （south） in mid summer, rainfall of Chongqing is less （more） and temperature in midsummer of Chongqing is higher （low- er）. In addition, the anomaly latitudinal position of SAH is found to be closely associated with drought and flood in midsummer of Chongqing, which indicates that the anomaly latitudinal position of SAH goes closely with the anomaly change of atmospheric circulation over East Asia, which induces abnormality in precipitation and temperature in the flooding season over China and Chongqing.

关 键 词：南亚高压 重庆 盛夏 降水 气温 

分 类 号：P434.5[天文地球—大气科学及气象学]