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《SCIENTIA ATMOSPHERICA SINICA》 1997-02
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The Analysis of the Relationship between the Spatial Modes of Summer Precipitation Anomalies over China and the General Circulation

Wang Xiaochun and Wu Guoxiong (Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080)  
The precipitation data at 5° by 5° grid (June, July and August) from 1959 to 1994 are used to analyze the monthly change of the spatial mode of summer precipitation anomalies over China. The relation between the spatial mode of summer precipitation anomalies and the atmospheroc general circulation is analyzed by using indices of the Northwestern Pacific High, and the geo potential height index B of the Tibetan Plateau. The Monte Carlo method is used to evaluate the significance level of the collective significance of the correlation field between the circulation index and precipitation. Our results show that the negative correlation between the precipitation anomaly over the lower reaches of the Yangtze River and Huaihe River valley (LRYH region) and that over the middle reaches of the Yellow River (MRY region) and over the South China (Spatial mode 1, or SP1) is the most significant in August. The negative correlation between the precipitation anomaly over the southern part of the eastern Tibetan Plateau and that over the northern part of the eastern Tibetan Plateau (Spatial mode 2, or SP2) is more significant in June and August than in July. The analyses for the correlation between indices of the Northwestern Pacific High and monthly precipitation show that the anomaly of the north boundary of the Northwestern Pacific High in August has the greatest influence on SP1. If the Northwest Pacific High is steadily located in a position that is north to its normal, it is very likely that the precipitation over the LRYH region is below normal, and the precipitation over the MRY region and South China is above normal, and vice versa. The analyses of the correlation between the geopotential height index B over the Tibetan Plateau and monthly precipitation show that the activity of the high and low vortex has an influence on SP2. If the activity of the high over Tibetan Plateau is more frequent, then it is very likely that the precipitation of the southern part of the Tibetan Plateau is above normal, and the precipitation over the northern part is below normal, and vice versa. The activity of the Northwestern Pacific High in August can also influence the spatial mode of the summer precipitation anomalies over the northern and southern part of the eastern Tibetan Plateau.
【Fund】: 中国科学院“灾害性气候的预测及其对农业年景和水资源调配的影响”项目,国家科委“九五”重中之重项目“我国短期气候预测业务系统的研究”以及国家自然科学基金项目的联合资助
【CateGory Index】: P426.6
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