| 2011年8月气候异常及成因分析 |
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| 引用本文： | 孙冷,任福民,王遵娅,刘芸芸,柳艳菊,王朋岭,王东阡.2011年8月气候异常及成因分析[J].气象,2012,38(5):615-622. |
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| 作者姓名： | 孙冷 任福民 王遵娅 刘芸芸 柳艳菊 王朋岭 王东阡 |
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| 作者单位： | 国家气候中心,北京,100081 |
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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（HXGYHY200806009）共同资助 |
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| 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。
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| 关 键 词： | 气候异常 西南干旱 热带气旋 成因分析 |
| 收稿时间： | 2011/10/20 0:00:00 |
| 修稿时间： | 2012/1/17 0:00:00 |
Analysis of Climate Anomaly and Causation in August 2011 |
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| SUN Leng,REN Fumin,WANG Zuny,LIU Yunyun,LIU Yanju,WANG Pengling and WANG Dongqian.Analysis of Climate Anomaly and Causation in August 2011[J].Meteorological Monthly,2012,38(5):615-622. |
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| Authors: | SUN Leng REN Fumin WANG Zuny LIU Yunyun LIU Yanju WANG Pengling and WANG Dongqian |
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| Institution: | National Climate Centre,Beijing 100081 |
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| 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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| Keywords: | climate anomaly drought in Southwest China tropical cyclone causation analysis |
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