| Influence of the Convection over the South China Sea on the Summer Precipitation of Shandong Province |
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| 基金项目： | 南沙群岛及其邻近海区综合考察项目，Dr.Wu Guoxiong gave valuable comments on the study at the very beginning of the research work. Dr. Sun Jilin，Senior engineer Hu Guifang kindly provided the data needed |
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| 摘 要： | 1 Introduction ShandongProvince ,whichislocatedintheeastofChina ,consistspartlyofpeninsulaandpartlyofinlandwithatotalareaofabout 1 5 0 0 0 0km2 .Lyingfrom34°2 0′Nto 38°2 0′Nandfrom 1 1 4°4 0′Eto 1 2 2°4 0′E ,alltheareabelongstothemoderateregionandtothetypicalAsianmonsoonclimate .SoShandong’ssum merprecipitationaccountsforover 6 0 %oftheannualrainfall,andaccordinglyflood droughtdisastersmain lyoccurinsummer.Moreover,becauseitisgeographi callylocatedinthetransitionalareabetweenthe…
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| 关 键 词： | 南海 夏季 山东 降水 对流强度 甚长长波辐射 季风 |
| 收稿时间： | 13 January 2004 |
| 修稿时间： | 15 March 2004 |
Influence of the convection over the South China Sea on the summer precipitation of Shandong Province |
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| Authors: | Zhang Suping Liu Qinyu Gong Dianli Liu Shijun |
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| Institution: | 1. Physical Oceanography Lab. & Ocean-Atmosphere Interaction and Climate Lab., Ocean University of China, Qingdao 266003, P. R. China
2. Meteorological Institute of Shandong Province, Jinan 250031, P.R. China |
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| Abstract: | The pentad average minimum outgoing longwave radiation (OLR) data over the northern South China Sea (SCS) are selected as
indexes to analyze the intensity of the convection connected with the SCS monsoon onset. Statistic analysis demonstrates that
the index can account for the intensity of the SCS monsoon about, at least, 75%. A significant negative correlation (confident
level over 90%) between Shandong’s summer rainfall and the index is found only in the period of 24–26 pentads and limited
to the area above the deeper water basin of the SCS (10°–20°N, 110°–117.5°E). Thus the minimum OLR over the deeper water basin
during 24–26 pentads can be used as a valuable predictor for the long-lead forecast of the precipitation. The 500hPa geopotential
height data in the Northern Hemisphere for the period from 1951 to 2000 are used in order to characterize the physical mechanisms
involved. The composite anomalies of the 500hPa level allow for the identification and detection of the teleconnection of
the East Asia-North America (EAP) pattern that is responsible to some extent for the interannual variability of the precipitation
of Shandong Province. Besides, the interannual differences of the intraseasonal variations (ISV) of OLR and their northward
transmission probably make a contribution to the position of the subtropical high which is vital for the summer rainfall in
the province. |
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| Keywords: | convection intensity South China Sea interannual variations summer rainfall Shandong Province OLR |
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