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气象:2012,38(5):615-622
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2011年8月气候异常及成因分析
(国家气候中心,北京 100081)
Analysis of Climate Anomaly and Causation in August 2011
(National Climate Centre, Beijing 100081)
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投稿时间:2011-10-20    修订日期:2012-01-17
中文摘要: 在总结2011年8月我国气候异常与大气环流特征的基础上,针对西南干旱和热带气旋活动偏少两大气候异常事件的成因进行了分析。结果表明:高度场偏高、西太平洋副热带高压偏强、夏季风偏弱和水汽条件较差等大气环流异常是导致高温干旱的主要原因;中部型拉尼娜事件的滞后影响和印度洋偏暖的影响是西南干旱的重要外强迫条件。南海对流活动偏弱,菲律宾以东季风槽位置偏北,热带气旋活动区域垂直风切偏大,西北太平洋副热带高压偏强等因素导致热带气旋活动偏少。
Abstract:Climate anomaly and atmospheric circulation features were analyzed over China in August 2011. Causation of drought in Southwest China (SWC) and less tropical cyclone (TC) activities over the western North Pacific and the South China Sea (SCS) were studied in this paper. Results showed that anomalous atmospheric circulation including positive 500 hPa geopotential height anomaly, the stronger West Pacific subtropical high (WPSH), weak summer monsoon, weak vapor transportation was the main reason for the SWC drought. Moreover, the SWC drought might be caused by the lag impact of 2010/2011 central Pacific La Nina event and warm mode of the Indian Ocean. In addition, less TC activities were due to the combined impacts of multi factors including weak convection over the SCS, abnormally northward monsoon trough east of Philippines, large vertical shear anomalies and the stronger WPSH.
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基金项目:国家自然科学基金项目(41005037),国家科技支撑计划(2009BAC51B02)和公益性行业(气象)科研专项(HX GYHY200806009)共同资助
引用文本:
孙冷,任福民,王遵娅,刘芸芸,柳艳菊,王朋岭,王东阡,2012.2011年8月气候异常及成因分析[J].气象,38(5):615-622.
SUN Leng,REN Fumin,WANG Zunya,LIU Yunyun,LIU Yanju,WANG Pengling,WANG Dongqian,2012.Analysis of Climate Anomaly and Causation in August 2011[J].Meteor Mon,38(5):615-622.