THE INTERANNUAL AND INTERDECADAL VARIATIONS OF TROPICAL CYCLONES IN THE NORTHWEST PACIFIC AND ITS RELATIONSHIP WITH THE SOUTH ASIA HIGH

Zhang Yanxia; Qian Yongfu; Wang Qianqian

Vol.15, NO.1, 2004

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Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(1): 74-80

Zhang Yanxia, Qian Yongfu, Wang Qianqian. The interannual and interdecadal variations of tropical cyclones in the Northwest Pacific and its relationship with the South Asia High. J Appl Meteor Sci, 2004, 15(1): 74-80.

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THE INTERANNUAL AND INTERDECADAL VARIATIONS OF TROPICAL CYCLONES IN THE NORTHWEST PACIFIC AND ITS RELATIONSHIP WITH THE SOUTH ASIA HIGH

1.
Department of Atmospheric Science , Nanjing University , Nanjing 210093
2.
Nanjing Institute of Meterology , Nanjing 210044

Received Date: 2002-06-05
Rev Recd Date: 2003-07-24
Publish Date: 2004-02-29

Abstract

Abstract

By use of annual numbers of the Tropical Cyclone (TC) in 48 years (1949—1996) and monthly mean characteristic parameters of the South Asia High (SAH) in 40 years (1958—1997), the features of interannual and interdecadal variations as well as the period and period energy of the annual TC numbers are analyzed. Furthermore, the relationships between the annual TC numbers and the characteristic parameters of SAH are depicted, and the features of the SAH circulation and the 100 hPa height field in prior time in TC abnormal years are also composed and discussed. The results show that the TC numbers in Northwest Pacific have obvious interannual and interdecadal variations, and that the SAH in prior time has a certain influence on the TC frequency in a year. When the center of the SAH goes more westward and northward, and its center intensity is weaker, the TC numbers in the year would be more, and vice versa.
- Northwest Pacific;
- Tropical cyclone;
- South Asia High;
- Interannual and interdecadal variation

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References(13)

Figures and Tables

图 1 TC年个数

(图中实线表示TC年个数，虚线表示TC年个数的11年滑动平均，直线表示多年平均的TC个数)

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图 2 TC年个数周期(a)，TC周期能量(b)

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图 3 前一年、当年和后一年SAH 中心强度与当年TC频数的相关分析

(图中的两条直线表示通过95 %信度检验的相关系数临界值，横坐标表示月:前一年1月到后一年12月)

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图 4 100 hPa 高度场与TC频数的相关分析

(a)当年1月和(b)当年11月的相关场(图中G 表示SAH 中心平均位置，粗线以下部分表示相关系数超过-0.4)

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图 5 异常TC年前期1月SAH 环流和100 hPa 高度的偏差场

(a)多TC年和(b)少TC年环流偏差场，(c)多TC年和(d)少TC年高度偏差场(图中G 表示异常TC年SAH 的中心平均位置，高度场单位:dagpm)

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图 6 100 hPa 高度场与TC频数的相关时段(O-J)分析

(图中G 表示相关时段的SAH 中心平均位置,粗线以下部分表示相关系数超过-0.4)

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表 1 异常TC年份

表 2 SAH强、弱年份

表 3 前期(O-A)SAH 平均强度与当年TC频数的相关

References

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