| Year aridity index patterns in northwest China and the relationship to summer North Atlantic sea surface temperature |
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| 作者姓名： | YAN Yan ZHAO Xinyi ZHOU Liping |
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| 作者单位： | College of Urban and Environmental Sciences, Laboratory for Earth Surface Processes of Ministry of Education, Peking University, Beijing 10087, China;College of Urban and Environmental Sciences, Laboratory for Earth Surface Processes of Ministry of Education, Peking University, Beijing 10087, China;College of Urban and Environmental Sciences, Laboratory for Earth Surface Processes of Ministry of Education, Peking University, Beijing 10087, China |
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| 摘 要： | Aim to linking the variability of drought in northwest China to the oceanic influence of North Atlantic SSTs at the background of global warming and at the regional climate change shifting stages, year aridity index variations in northwest China and summer North Atlantic sea surface temperature （SST） variations are examined for the 44 a period of 1961-2004 using singular value decomposition （SVD） analysis. Results show that the SST anomalies （SSTA）in the North Atlantic in summer reflected three basic models. The first SVD mode of SST pattern shows a dipole - like variation with the positive center located at southwest and negative center at northeast of extratropical North Atlantic. And it strongly relates to the positive trend in AI variation in northwest China. The second coupled modes display the coherent positive anomalies in extratropical North Atlantic SST and the marked opposite trend of AI variability between north and south of Xinjiang. In addition, the lag correlation analysis of the first mode of SSTA and geopotential heights at 500 hPa variations also shows that the indication of the former influencing the latter configuration, which result in higher air temperature and less precipitation when the SSTA in the North Atlantic Ocean in summer motivated Eurasian circulation of EA pattern, further to influence the wet - dry variations in northwest China by the ocean-to - atmosphere forcing.
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| 关 键 词： | 干燥度 SSTA 远程并置对比 SVD 中国 |
| 收稿时间： | 2007/8/13 0:00:00 |
| 修稿时间： | 3/6/2008 12:00:00 AM |
Year aridity index patterns in northwest China and the relationship to summer North Atlantic sea surface temperature |
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| YAN Yan,ZHAO Xinyi,ZHOU Liping.Year aridity index patterns in northwest China and the relationship to summer North Atlantic sea surface temperature[J].Acta Oceanologica Sinica,2008,27(3):161-171. |
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| Authors: | YAN Yan ZHAO Xinyi and ZHOU Liping |
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| Institution: | College of Urban and Environmental Sciences, Laboratory for Earth Surface Processes of Ministry of Education, Peking University, Beijing 100871, China |
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| Abstract: | Aim to linking the variability of drought in northwest China to the oceanic influence of North Atlantic SSTs at the background of global warming and at the regional climate change shifting stages, year aridity index variations in northwest China and summer North Atlantic sea surface temperature (SST) variations are examined for the 44 a period of 1961--2004 using singular value de-composition (SVD) analysis. Results show that the SST anomalies (SSTA) in the North Atlantic in summer reflected three basic models. The first SVD mode of SST pattern shows a dipole - like variation with the positive center located at southwest and nega-tive center at northeast of extratropical North Atlantic. And it strongly relates to the positive trend in AI variation in northwest China. The second coupled modes display the coherent positive anomalies in extratropical North Atlantic SST and the marked opposite trend of AI variability between north and south of Xinjiang. In addition, the lag correlation analysis of the first mode of SSTA and geopotential heights at 500 hPa variations also shows that the indication of the former influencing the latter configuration, which re-sult in higher air temperature and less precipitation when the SSTA in the North Atlantic Ocean in summer motivated Eurasian cir-culation of EA pattern, further to influence the wet - dry variations in northwest China by the ocean-to - atmosphere forcing. |
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| Keywords: | aridity index SSTA teleconnection patterns SVD |
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