STUDY OF INTERDECADAL INTERANNUAL VARIATION OF
RAINFALL OVER MID-LOWER REACHES OF CHANGJIANG
RIVER AND ITS MECHANISM

Li Feng; He Lifu

Vol.13, NO.6, 2002

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(6): 718-726

Li Feng, He Lifu. Study of interdecadal interannual variation of rainfall over mid-lower reaches of Changjiang River and its mechanism. J Appl Meteor Sci, 2002, 13(6): 718-726.

Citation:

Li Feng, He Lifu. Study of interdecadal interannual variation of rainfall over mid-lower reaches of Changjiang River and its mechanism. J Appl Meteor Sci, 2002, 13(6): 718-726.

Li Feng, He Lifu. Study of interdecadal interannual variation of rainfall over mid-lower reaches of Changjiang River and its mechanism. J Appl Meteor Sci, 2002, 13(6): 718-726.

Citation:

Li Feng, He Lifu. Study of interdecadal interannual variation of rainfall over mid-lower reaches of Changjiang River and its mechanism. J Appl Meteor Sci, 2002, 13(6): 718-726.

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STUDY OF INTERDECADAL INTERANNUAL VARIATION OF RAINFALL OVER MID-LOWER REACHES OF CHANGJIANG RIVER AND ITS MECHANISM

Li Feng^1,**,
He Lifu²

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

Received Date: 2001-07-05
Rev Recd Date: 2002-06-10
Publish Date: 2002-12-31

Abstract

Abstract

Based on the NOAA/NCEP reanalyzed data, SST from the England National Meteorological Bureau, and precipitation data and Subtropical West Pacific High parameters from the National Meteorological Center, the interactions of East-Asian summer monsoon with Mid-east Pacific SSTA are analyzed. The interactions display an inter-decadal variation feature. It is found that the East Asian meridional cell is coupled closely with the low-latitude zonal cell after 1976, which strengthens the association between East-Asian summer monsoon and Mid-east Pacific SSTA. The previous winter SSTA over the Mid-east Pacific affects the offsea SSTA in next summer, as heat sources enforce the Subtropical West Pacific High; as a result, the rainfall over the Mid-lower reaches of the Changjiang River in summer is abundant
- Mid-lower reaches of the Changjiang River;
- Rainfall;
- Pacific SSTA;
- Interdecadal variation Subtropical high

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References(10)

Figures and Tables

图 1 长江中下游地区12 个测站的夏季平均降水距平的年际演变

(直方图是逐年夏季降水距平,曲线是5 点平滑线)

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图 2 长江中下游地区夏季降水与西太平洋副高脊线纬度的滑动相关曲线

(虚线为0.05 的信度检验水平)

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图 3 长江中下游地区夏季降水与太平洋SS TA 同期相关分布

(a)1958-1975 年(b)1976-1993 年

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图 4 我国近海(15°~25°N,120°~140°E)地区 SSTA 与西太平洋副高脊线纬度的年际演变曲线

(实线是近海SSTA 放大10 倍,单位:℃；虚线是副高脊线纬度距平,单位:°N)

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图 5 1976-1993 年长江中下游夏季平均多雨、少雨年太平洋海温较差(a)和500 hPa 较差(b)分布形势

(阴影区为t_k 统计量分别通过0.1(a)和0.05(b)信度检验的区域)

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图 6 夏季近海海温与中东太平洋1~12 月份 SSTA 的逐月相关系数曲线

(虚线表示0.05 的信度水平线)

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图 7 东亚夏季经圈环流指数(实线c)、低纬纬向沃克环流

指数(实线a)和中东太平洋夏季SSTA(虚线b,放大2 倍,单位:℃)的年际演变曲线

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表 1 长江中下游夏季降水与夏季西太平洋副高参数的分段相关系数表

References

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