| 2011年春末夏初长江中下游地区旱涝急转成因初探 |
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| 引用本文： | 封国林,杨涵洧,张世轩,王阔,沈柏竹.2011年春末夏初长江中下游地区旱涝急转成因初探[J].大气科学,2012,36(5):1009-1026. |
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| 作者姓名： | 封国林 杨涵洧 张世轩 王阔 沈柏竹 |
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| 作者单位： | 1.兰州大学大气科学学院,兰州 730000;国家气候中心,中国气象局气候研究开放实验室,北京 100081 |
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| 基金项目： | 国家自然科学基金资助项目40930952、41175067,全球变化重大研究计划2012CB955902,公益性行业科研专项GYHY200806005、GYHY201006021,吉林省科技发展计划20090424 |
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| 摘 要： | 选用NCEP/NCAR、NOAA、国家气候中心(NCC)提供的各要素资料及NOAA-Hysplit模型,对2011年春末夏初发生在中国长江中下游地区旱涝急转的降水异常事件及其影响机制进行初步分析,并建立天气学概念模型.结果表明:(1)长江中下游地区,尤其是(27°N～～32°N,l10°E～120°E)区域在6月第1候...
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| 关 键 词： | 旱涝急转 La Ni(n)a 印度洋海温 Hadley环流 副热带高压 中高纬稳定分量 |
| 收稿时间： | 2011/11/10 0:00:00 |
| 修稿时间： | 2012/4/18 0:00:00 |
A Preliminary Research on the Reason of a Sharp Turn from Drought to Flood in the Middle and Lower Reaches of the Yangtze River in Late Spring and Early Summer of 2011 |
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| FENG Guolin,YANG Hanwei,ZHANG Shixuan,WANG Kuo and SHEN Baizhu.A Preliminary Research on the Reason of a Sharp Turn from Drought to Flood in the Middle and Lower Reaches of the Yangtze River in Late Spring and Early Summer of 2011[J].Chinese Journal of Atmospheric Sciences,2012,36(5):1009-1026. |
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| Authors: | FENG Guolin YANG Hanwei ZHANG Shixuan WANG Kuo and SHEN Baizhu |
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| Institution: | 1.Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000;Laboratory for Climate Studies of China Meteorological Administration, National Climate Center, Beijing 1000812.Department of Atmospheric Sciences, Lanzhou University, Lanzhou 7300003.Department of Atmospheric Sciences, Lanzhou University, Lanzhou 730000;Jilin Meteorological Science Institute, Changchun 130062 |
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| Abstract: | Using some kinds of meteorological factors data provided by NCEP/NCAR NOAA and National Climate Center (NCC), and NOAA-Hysplit model to preliminarily analyze characteristics of precipitation and mechanism of a sharp turn from drought to flood in the middle and lower reaches of the Yangtze River in the early summer of 2011, the authors establish a synoptic concept model and conclude that: 1) The most serious sharp turn from drought to flood occurred in the middle and lower reaches of the Yangtze River, especially in the region of (27oN-32oN, 110oE-120oE), in the 1st pentad in June (around 3 June);2) analysis of sea surface temperature (SST) anomaly and the singular value decomposition (SVD) between SST and precipitation shows that the variance contribution of this sharp turn is smaller and it is an anomalous event, whose early signals exist in the equatorial middle an eastern Pacific and the equatorial Indian Ocean;3) analysis of vorticity low frequency oscillation and 10-30 d stable component indicates that dynamic mechanism across the Pacific Ocean has a great influence on precipitation in the middle and lower reaches of the Yangtze River in June, and the stable circulation in middle and high latitude areas provides a large scale circulation background field;4) before the sharp turn, there existed a stronger La Ni?a in the equatorial middle an eastern Pacific, and the equatorial Indian Ocean was controlled by negative SST anomaly on a large scale, influenced by the both, the western Pacific subtropical high was abnormally eastward, the Walker circulation was stronger, and the Hadley circulation over the Indian Ocean was weaker. All of those leaded to the lack of water vapor transport from southwest and southeast, thus a serious and sustained drought occurred in the middle and lower reaches of the Yangtze River. As the SST anomaly in both the oceans weakened, the western Pacific subtropical high suddenly extended westward and became stable (in the 1st pentad in June), the Walker circulation became weak, and the Hadley circulation over the Indian Ocean became stronger. Matching with the stable circulation on a large scale in middle and high latitude areas, it resulted in continuous converging of cold and warm air and vast precipitation over the middle and lower reaches of the Yangtze River. Finally, the sharp turn happened. |
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| Keywords: | sharp turn from drought to flood La Niñ a SST over the Indian Ocean Hadley circulation subtropical high over the Pacific Ocean stable component in middle and high latitude areas |
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