| 西南地区冬季气温和降水的时空变化 |
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| 引用本文： | 蒋兴文,李跃清.西南地区冬季气温和降水的时空变化[J].地理学报(英文版),2011,21(2):250-262. |
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| 作者姓名： | 蒋兴文 李跃清 |
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| 作者单位： | College of Atmospheric Sciences,Lanzhou University;Institute of Plateau Meteorology,China Meteorological Administration |
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| 基金项目： | No.40875060，No.60832012，Basic Research and Operation Program of Institute of Plateau Meteorology |
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| 摘 要： | In recent years,the socio-economic impacts of winter extreme climate events have underscored the importance of winter climate anomalies in Southwest China (SWC).The spatio-temporal variability of surface air temperature (SAT) and precipitation in SWC and their possible causes have been investigated in this paper based on observational data from 1961 to 2010.The results indicate that SAT anomalies in SWC have two dominate modes,one is homogenous,and the other a zonal dipole.The former is caused by the anomalies of East Asian winter monsoon;the latter arises from the anomalies of both subtropical west Pacific high and regional cold air in lower troposphere.The most dominant mode of precipitation anomalies in SWC is homogenous and it has a high correlation with northern hemisphere annular mode (NAM,AO).Neither NAM nor ENSO has significant impacts on SAT in SWC.The anomalies of NAM are associated with the anomalies of tropical circulations,and there-fore precipitation over the SWC.When NAM is in positive (negative) phase,the winter pre-cipitation is more (less) than normal in SWC.Winter precipitation increase over the whole SWC is associated with the El Nino.However,during La Nina winter,the pattern is not uni-form.There is an increase in precipitation over the central parts and a decrease in western and eastern parts of SWC.The severe drought in SWC in winter 2010 is more likely caused by anomalies of NAM,not El Nino.
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| 关 键 词： | Southwest China winter 2010 drought winter monsoon northern hemisphere annular mode (NAM AO) |
| 收稿时间： | 31 May 2010 |
Spatio-temporal variability of winter temperature and precipitation in Southwest China |
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| Xingwen?Jiang,Yueqing?Li.Spatio-temporal variability of winter temperature and precipitation in Southwest China[J].Journal of Geographical Sciences,2011,21(2):250-262. |
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| Authors: | Xingwen Jiang Yueqing Li |
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| Institution: | (1) Centre for Australian Weather and Climate Research, GPO Box 1289K, Melbourne, VIC, 3001, Australia;(2) China University of Geosciences, Wuhan, China;(3) CSIRO Mathematics, Informatics and Statistics, Perth, WA, Australia |
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| Abstract: | In recent years, the socio-economic impacts of winter extreme climate events have underscored the importance of winter climate anomalies in Southwest China (SWC). The spatio-temporal variability of surface air temperature (SAT) and precipitation in SWC and their possible causes have been investigated in this paper based on observational data from 1961 to 2010. The results indicate that SAT anomalies in SWC have two dominate modes, one is homogenous, and the other a zonal dipole. The former is caused by the anomalies of East Asian winter monsoon; the latter arises from the anomalies of both subtropical west Pacific high and regional cold air in lower troposphere. The most dominant mode of precipitation anomalies in SWC is homogenous and it has a high correlation with northern hemisphere annular mode (NAM, AO). Neither NAM nor ENSO has significant impacts on SAT in SWC. The anomalies of NAM are associated with the anomalies of tropical circulations, and therefore precipitation over the SWC. When NAM is in positive (negative) phase, the winter precipitation is more (less) than normal in SWC. Winter precipitation increase over the whole SWC is associated with the El Niño. However, during La Niña winter, the pattern is not uniform. There is an increase in precipitation over the central parts and a decrease in western and eastern parts of SWC. The severe drought in SWC in winter 2010 is more likely caused by anomalies of NAM, not El Niño. |
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| Keywords: | Southwest China winter 2010 drought winter monsoon northern hemisphere annular mode （NAM AO） |
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