| 2011年江南地区梅雨异常成因分析 |
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| 引用本文： | 钱卓蕾.2011年江南地区梅雨异常成因分析[J].科技通报,2012,28(5):51-58. |
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| 作者姓名： | 钱卓蕾 |
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| 作者单位： | 浙江省绍兴市气象台,浙江绍兴,312000;中国科学院大气物理研究所NZC,北京,100029 |
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| 摘 要： | 2011年梅雨季起止日期都较早,降水量较大,且呈现出相当的地域分布特征,值得深入分析研究。本文主要对梅雨相关环流成因和西太平洋海温分布进行了初步分析。结果表明:南压高压和西太平洋副热带高压北跳偏早,是梅雨偏早的强信号;副热带高压位置偏东导致降水带偏南偏东;高空西风急流与降水异常有密切联系;中层"三阻型"环流分布有利于冷空气的持续南下,促进强降水的激发和维持;低空急流是梅雨主要水汽来源,长江中下游为水汽集中辐合区;此外,OLR和前期海温分布对副热带高压提早北跳和降水的地域性分布也有重要指示作用。
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| 关 键 词： | 江南地区 梅雨 副热带高压 南亚高压 西南急流 |
Causes Analysis of Abnormal Meiyu over South of the Middle-Lower Reachs of the Changjiang River in 2011 |
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| QIAN Zhuolei.Causes Analysis of Abnormal Meiyu over South of the Middle-Lower Reachs of the Changjiang River in 2011[J].Bulletin of Science and Technology,2012,28(5):51-58. |
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| Authors: | QIAN Zhuolei |
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| Institution: | QIAN Zhuolei1,2(1.Shaoxin Meteorological observatory,Zhejiang Meteorological Office,Zhejiang Shaoxing,312000 China; 2.NZC,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,100029 China) |
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| Abstract: | The Meiyu in 2011 is abnormal with earlier beginning and ending dates and larger precipitation amount,presents a quite regional distribution,deserving in-depth analysis and research.This paper is motivated by the analysis of the associated atmospheric circulation as well as the OLR and sea surface temperature(SST) distribution over the Pacific Oceans.Results show that both the South Asian High and the Western Pacific Subtropical High jump northward quite early in 2011,which is closely associated with the earlier Meiyu for that year.Partial east Subtropical High results in anomaly south and east precipitation;High altitude west breeze rushing is closely related to precipitation anomalies;Meanwhile,there were three Blocking Highs in the middle latitude Eurasia,providing the cold air advection to the Meiyu region in south of the Middle-Lower reaches of the Yangtze River Valley which is favorable to the Meiyu rainfall.Low layer jet is the main source of water vapor,and the south of the Middle-Lower reaches of the Yangtze River Valley is the convergent zone of water vapor concentration.In addition,higher SSTs over the warm pool region of western Pacific and lower SSTs over the eastern Pacific(La Nina-like SST pattern) contributed to the stronger and earlier ’westward shift’ of the Western Pacific Subtropical High.Besides,The OLR and SST distribution have important instruction on the earlier jump of Subtropical High and strong Regional precipitation. |
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| Keywords: | South of the Middle-lower reachs of the Changjing river Meiyu Subtropical High South Asia High Southwestly jet |
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