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| An Analysis of the Causes of Decadal Variations of Rainfall in Shandong in Summer | |
| 作者姓名： | GAOAnchun ZHANGSuping SHENPeilu WUJiejing |
| 作者单位： | [1]LinyiMeteorologicalBureau,Linyi,Shandong276004,P.R.China [2]PhysicalOceanographyLaboratory,OceanUniversityofChina,Qingdao266003,P.R.China [3]QingdaoMeteorologicalBureau,Qingdao266003,P.R.China [4]LinyiMeteorologicalBureau,Linyi,Shandong276004,P.R.China／／PhysicalOceanographyLaboratory,OceanUniversityofChina,Qingdao266003,P.R.China |
| 摘 要： | The precipitation in Shandong in July, August as well as the whole summer (JJA) and the corresponding 500hPa geopotential height fields are analyzed by means of the SVD (singular value decomposition) methodology. It is found that the general circulations in East Asia and the Western Pacific underwent decadal changes around 1979. The geopotential height, in particular over key areas like the South China Sea and the Philippines, increased after 1979. Corresponding to the changes in the geopotential height, the rainfall in Shandong started to decrease around 1979. The synthesized analysis shows that when the geopotential height at 500hPa level decreases in the key areas, the Western Pacific subtropical high shifts northward and an anticyclonic anomalous cell enforces the southerly flow over Shandong-Korea-Japan, Shandong could experience a wet period. A dry period is likely to occur when the geopotential height increases in these key areas, the subtropical high moves southward or expands westward to a great distance, and a cyclonic anomalous cell controls Shandong. Respective conceptual models for the causative mechanism are obtained for the cases of July, August and the whole summer (JJA). |
| 关 键 词： | 夏季暴雨 山东 位势高度 海洋气候 奇异值分解 |
| 收稿时间： | 11 May 2004 |
| 修稿时间： | 22 November 2004 |
An analysis of the causes of decadal variations of rainfall in Shandong in summer |
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| GAOAnchun ZHANGSuping SHENPeilu WUJiejing.An Analysis of the Causes of Decadal Variations of Rainfall in Shandong in Summer[J].Journal of Ocean University of China,2005,4(2):99-107. | |
| Authors: | Gao?Anchun |
| Institution: | 1. Linyi Meteorological Bureau, Linyi, Shandong 276004, P.R. China;Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, P.R. China 2. Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, P.R. China 3. Linyi Meteorological Bureau, Linyi, Shandong 276004, P.R. China 4. Qingdao Meteorological Bureau, Qingdao 266003, P. R. China |
| Abstract: | The precipitation in Shandong in July, August as well as the whole summer (JJA) and the corresponding 500 hPa geopotential height fields are analyzed by means of the SVD (singular value decomposition) methodology. It is found that the general circulations in East Asia and the Western Pacific underwent decadal changes around 1979. The geopotential height, in particular over key areas like the South China Sea and the Philippines, increased after 1979. Corresponding to the changes in the geopotential height, the rainfall in Shandong started to decrease around 1979. The synthesized analysis shows that when the geopotential height at 500 hPa level decreases in the key areas, the Western Pacific subtropical high shifts northward and an anticyclonic anomalous cell enforces the southerly flow over Shandong-Korea-Japan, Shandong could experience a wet period. A dry period is likely to occur when the geopotential height increases in these key areas, the subtropical high moves southward or expands westward to a great distance, and a cyclonic anomalous cell controls Shandong. Respective conceptual models for the causative mechanism are obtained for the cases of July, August and the whole summer (JJA) . |
| Keywords: | summer rainfall Shandong Province 500hPa geopotential height decadal variations SVD analysis |
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