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气象:2012,38(7):884-889
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2011/2012年冬季我国异常低温特征及可能成因分析
(1.国家气候中心,北京 100081;2.中国气象科学研究院,北京 100081)
Features and Possible Causes for the Low Temperature in Winter 2011/2012
(1.National Climate Centre, Beijing 100081;2.Chinese Academy of Meteorological Sciences, Beijing 100081)
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投稿时间:2012-04-24    修订日期:2012-05-12
中文摘要: 2011/2012年冬季,我国大部气温异常偏低,全国平均气温仅有-4.8℃,为1986年以来最低值,同时我国内蒙古、新疆、西藏和陕西一些地区日最低气温均突破历史极值。本文利用1951—2010年的中国台站气温资料及NCEP再分析资料对冬季气温异常偏低的原因分析后表明,2011/2012年东亚冬季风异常偏强造成了我国气温大范围异常偏低。异常偏强的东亚冬季风环流系统也表现为:对流层低层西伯利亚地区为异常冷高压控制,对流层中高层从乌拉尔山到贝加尔湖地区上空阻塞异常偏强,东亚大槽异常偏深。进一步的分析表明,2011年冬季时期赤道中东太平洋地区出现的La Nina事件可能是造成东亚冬季风系统异常的原因之一。
Abstract:During the winter (December 2011-February 2012), the surface air temperatures were below normal in most China, and the mean temperature in China was -4.8℃, being the coldest winter since 1986. The extreme low temperature climate events were prevailed in China such as the extremes of daily temperature drop (DTD), which were observed in Inner Mongolia, Xinjiang, Xizang and Shaanxi. The possible cause for the extreme low temperatures in China was investigated by using the conventional observational temperatures and NCEP reanalysis datasets. The results have shown that the strong East Asian winter monsoon might be responsible for occurrence of extreme low temperatures, with dominating of anomalous cold high pressure system over the Siberian Plain, persistence of blocking system over the Ural Mountains and Baikal Lake, and deeper than normal East Asian major trough. Further analysis shows that La Nina might cause the abnormally stronger East Asian winter monsoon.
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基金项目:973项目(2012CB955901、2010CB950501和2010CB950404)及科技支撑项目(2009BAC51B05和2007BAC29B04)共同资助
引用文本:
孙丞虎,任福民,周兵,龚志强,左金清,郭艳君,2012.2011/2012年冬季我国异常低温特征及可能成因分析[J].气象,38(7):884-889.
SUN Chenghu,REN Fumin,ZHOU Bing,GONG Zhiqiang,ZUO Jinqing,GUO Yanjun,2012.Features and Possible Causes for the Low Temperature in Winter 2011/2012[J].Meteor Mon,38(7):884-889.