Changes of the Boundary Between the South Asian and East Asian Tropical Summer Monsoon Subsystems

Guo Pinchao; Song Chaohui

Vol.25, NO.5, 2014

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Article Navigation > Journal of Applied Meteorological Science > 2014 > 25(5): 527-537

Guo Pinchao, Song Chaohui. Changes of the boundary between the South Asian and East Asian tropical summer monsoon subsystems. J Appl Meteor Sci, 2014, 25(5): 527-537.

Citation:

Guo Pinchao, Song Chaohui. Changes of the boundary between the South Asian and East Asian tropical summer monsoon subsystems. J Appl Meteor Sci, 2014, 25(5): 527-537.

Guo Pinchao, Song Chaohui. Changes of the boundary between the South Asian and East Asian tropical summer monsoon subsystems. J Appl Meteor Sci, 2014, 25(5): 527-537.

Citation:

Guo Pinchao, Song Chaohui. Changes of the boundary between the South Asian and East Asian tropical summer monsoon subsystems. J Appl Meteor Sci, 2014, 25(5): 527-537.

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Changes of the Boundary Between the South Asian and East Asian Tropical Summer Monsoon Subsystems

Guo Pinchao,
Song Chaohui^,

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044

Received Date: 2013-12-25
Rev Recd Date: 2014-06-12
Publish Date: 2014-09-30

Abstract

Abstract

NCEP/NCAR 65-year daily reanalysis wind data are used to divide the boundary of the two tropical Asian summer monsoon subsystems (the South Asian summer monsoon and the East Asian Tropical summer monsoon). According to the boundary derived from the wind data, it's concluded that both of the Asian summer monsoons have their own control domain. A deviation index is defined which can describe changes of two Asian tropical summer monsoon subsystems' boundary, positive value means that the boundary of two tropical Asian summer monsoon subsystems is further east, while the negative value means their boundary is further west. Then comparative study is carried out to check out which area of the boundary changes larger. The area with intense changes is further investigated to study the change regulation of two Asian tropical summer monsoon subsystems. At last, a monsoon strength index is designed which can describe the strength change of Asian tropical summer monsoon.According to the latitude of vorticity minimum value, and the boundary deviation index between the decadal changes, results show the boundary change is either eastern, central or western. When the pattern of the central changes to the pattern of western, there is a mutation passing the test of 0.01 level. The low, medium and high layers of the three boundary categories are also quite different. And then, 10°-17.5°N area can be chosen as the main study area according to the oscillation amplitude. By using the boundary deviation to define the two Asian Tropical Summer monsoon indexes, it's found that consistent change happens more than reversed phase change for the strength of two summer monsoons. And the meridional wind anomaly field of four kinds of strength type from the Bay of Bengal to the South China Sea reflect the four anomaly situations:'+ -', '- +', '- -', and '+ +'.
- the South Asian summer monsoon;
- the East Asian tropical summer monsoon;
- boundary;
- monsoon trough

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References(30)

Figures and Tables

图 1 1948—2012年850 hPa夏季平均涡度场 (单位：10^-5/s)

(阴影区为正涡度区，粗断线为亚洲热带夏季风子系统的边界)

Fig. 1 850 hPa averaged vorticity in summertime from 1948 to 2012

(unit:10^-5/s; the shaded denotes positive vorticity, the thick broken line denotes the boundary of Asian tropical summer monsoon subsystems)

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图 2 1948—2012年亚洲两大热带夏季风子系统边界偏向指数

Fig. 2 The index of Asian tropical summer monsoon subsystems' boundary deviation from 1948 to 2012

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图 3 亚洲两大热带夏季风子系统边界的滑动t检验值

Fig. 3 The moving t-test value of Asian summer monsoon subsystems' boundary

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图 4 1948—2012年不同纬度上亚洲两大热带夏季风子系统边界所处的经度

Fig. 4 The longitude of Asian tropical summer monsoon subsystems' boundary at different latitudes from 1948 to 2012

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图 5 1948—2012年亚洲两大热带夏季风子系统边界的3次变动 (单位：10^-5/s)

(阴影为正涡度区，粗断线为子系统边界) (a) 1948—1960年，(b) 1961—1992年，(c) 1993—2012年

Fig. 5 Changes of Asian tropical summer monsoon subsystems' boundary from 1948 to 2012

(unit: 10^-5/s; the shaded denotes the positive vorticity, the thick broken line denotes the boundary) (a) 1948-1960, (b) 1961-1992, (c) 1993-2012

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图 6 3种边界类型的850 hPa高度场 (等值线，单位：dagpm) 和风场 (矢量) 距平与气候平均场对比

(a) 东部型边界，(b) 中部型边界，(c) 西部型边界，(d) 气候平均场

Fig. 6 850 hPa height field (contour, unit:dagpm) and wind field (vector) anomalies of three-kind boundary patterns and the climate mean

(a) the eastern pattern, (b) the central pattern, (c) the western pattern, (d) the climate average mean

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图 7 1948—2012年夏季风强度指数标准化序列

Fig. 7 Asian summer monsoon standardization index from 1948 to 2012

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图 8 4种不同季风强度对应的纬向风距平 (单位：m/s)

Fig. 8 Zonal wind anomaly of four-kind summer monsoon intensity (unit:m/s)

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图 9 4种不同季风强度对应的经向风距平 (单位：m/s)

Fig. 9 Meridional wind anomaly of four-kind summer monsoon intensity (unit:m/s)

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