INFLUENCE OF SST PATTERN ON THE RAINFALL IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER

Lin Jian; He Jinhai

Vol.11, NO.3, 2000

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2000 > 11(3): 339-347

Lin Jian, He Jinhai. Influence of sst pattern on the rainfall in the middle and lower reaches of the Yangtze River. J Appl Meteor Sci, 2000, 11(3): 339-347.

Citation:

Lin Jian, He Jinhai. Influence of sst pattern on the rainfall in the middle and lower reaches of the Yangtze River. J Appl Meteor Sci, 2000, 11(3): 339-347.

Lin Jian, He Jinhai. Influence of sst pattern on the rainfall in the middle and lower reaches of the Yangtze River. J Appl Meteor Sci, 2000, 11(3): 339-347.

Citation:

Lin Jian, He Jinhai. Influence of sst pattern on the rainfall in the middle and lower reaches of the Yangtze River. J Appl Meteor Sci, 2000, 11(3): 339-347.

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INFLUENCE OF SST PATTERN ON THE RAINFALL IN THE MIDDLE AND LOWER REACHES OF THE YANGTZE RIVER

Lin Jian¹,
He Jinhai²

1.
National Meteorological Center, Beijing 100081
2.
Department of Meteorology, Nanjing Institute of Meteorology, Nanjing 210044

Received Date: 1999-03-02
Rev Recd Date: 1999-09-22
Publish Date: 2000-08-31

Abstract

Abstract

By using the methods of EOF, SVD, correlation and composite analysis, the relationship between Pacific SSTA pattern and rainfall in the middle and lower reaches of the Yangtze River is investigated. Results suggest that SSTA from northwestern Pacific to southeastern Pacific maintains the pattern of "+ - + -" from the previous autumn to the subsequent summer, bearing a close relation to the EAP. The Pacific SSTA in the previous winter and spring led to the remarkable convection anomalies in low latitudes, which thereby resulted in the anomalous western Pacific Subtropical High and the rainfall in the Yangtze River Basin. Numerical simulations further confirm that rainfall in the middle and lower reaches of the Yangtze River is not only related to the tropical SSTA but also to the SSTA in the mid-latitude Pacific.

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References(13)

Figures and Tables

图 1 长江中下游涝旱年前秋 (a)、冬 (b) 季及当年春 (c)、夏 (d) 季太平洋海温差值分布 (涝年减旱年)

(图中“+、-”分别表示正值区和负值区)

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图 2 长江中下游涝、旱年夏季500 hPa风场差值图 (涝年减旱年)

(涝年: 1980, 1983, 1991年, 旱年: 1981, 1985, 1988年, C、A分别代表气旋、反气旋的中心位置)

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图 3 夏季 (7月) 500 hPa高度场异常与同期海温异常SVD分析第一模态及其时间系数与降水的相关分布 (a) 右奇异向量 (海温场, 阴影区为正值) ; (b) 左奇异向量 (高度场, 阴影区为负值); (c) 左 (实线) 右 (虚线) 场时间系数; (d) SVD第一模态时间系数与降水的相关

(阴影区达到0.05信度, 时间系数取左、右场时间系数的平均)

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图 4 敏感性试验所加的海温异常场 (左) 及正、负海温异常时500 hPa风场差值场 (右)

(a, b) 为试验一, (c, d) 为试验二, (C, A分别代表气旋、反气旋的中心位置)

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表 1 EAP指数准4年滤波前后与太平洋海温距平EOF分析时间系数的相关

表 2 试验设计

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