主汛期(6~8月)副高各指数与中国160站降雨的关系
RELATIONSHIP BETWEEN SUBTROPICAL HIGH INDEXES AT THE MAIN RAINING PERIODWITH THE RAINFALL OF 160 SAMPLING STATIONS IN CHINA
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摘要: 利用1951~2001年共51年6~8月副高5个指数与同期中国160站降雨建立标准化的多元回归方程,通过分析副高5个指数的偏回归系数及各方程复相关系数在时间和地域上的分布和变化,研究了副高各指数所反映的位置、形状、面积、强度等特征对我国主汛期降雨的综合影响以及这种影响在季节和地域上的差异,结果表明副高北界位置指数和脊线位置指数主要影响雨带位置的变化,西伸脊点指数与我国大部地区雨量的丰欠有关,面积和强度指数则由于采用的方法而表现出对降雨的影响呈相反的特性。从副高对我国主汛期降雨的拟合能力上看,7月拟合能力比6月和8月好,对东部地区和华南地区的拟合能力分别比西部地区和华北地区好。Abstract: This paper sets up standard multiple regression equations by using five subtropical high indexes and the rainfall data from 160 sampling stations in China from June to August. From the discussion of the distribution and change of the partial regression coefficients of five subtropical high indexes and the coefficient of multiple correlation coefficient of every equation, we study the composite influence of the location, shape, area and intensity that the subtropical high indexes reflect on the rainfall of the main raining period of China, and besides, the difference of the influence in season and region. The outcome shows that the north boundary index and ridge line index of subtropical high are related to the change of the location of main rain belt, and the western ridge point index of subtropical high is associated with the amount of the rain in most areas of China. According to the methods used in the work, the area index and the intensity index show the reverse effect on the rainfall. At last, we discuss the fitting ability of the subtropical high indexes to the rainfall of the main raining periods in China and find that this ability turns to be better in July than June and August. As far as the region is concerned, the fitting ability will be more effective for the south or east part of China than the north and west part.
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Key words:
- Main raining seasons /
- subtropical high index /
- precipitation /
- relationships
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