ANALYSES OF FEATURES AND MECHANISMS OF SUMMER MONSOON ONSETS OVER SCS AND ITS VICINITY IN 1998

Xu Guoqiang; Zhu Qiangen; Ran Yufang

Vol.13, NO.5, 2002

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2002 > 13(5): 535-549

Xu Guoqiang, Zhu Qiangen, Ran Yufang. Analyses of features and mechanisms of summer monsoon onsets over SCS and its vicinity in 1998. J Appl Meteor Sci, 2002, 13(5): 535-549.

Citation:

Xu Guoqiang, Zhu Qiangen, Ran Yufang. Analyses of features and mechanisms of summer monsoon onsets over SCS and its vicinity in 1998. J Appl Meteor Sci, 2002, 13(5): 535-549.

Xu Guoqiang, Zhu Qiangen, Ran Yufang. Analyses of features and mechanisms of summer monsoon onsets over SCS and its vicinity in 1998. J Appl Meteor Sci, 2002, 13(5): 535-549.

Citation:

Xu Guoqiang, Zhu Qiangen, Ran Yufang. Analyses of features and mechanisms of summer monsoon onsets over SCS and its vicinity in 1998. J Appl Meteor Sci, 2002, 13(5): 535-549.

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ANALYSES OF FEATURES AND MECHANISMS OF SUMMER MONSOON ONSETS OVER SCS AND ITS VICINITY IN 1998

1.
Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Nanjing Institute of Meteorology, Nanjing 210044

Received Date: 2001-04-18
Rev Recd Date: 2001-11-07
Publish Date: 2002-10-31

Abstract

Abstract

In the context of reanalysis NCEP/NCAP daily data and SST in 1998, the features and mechanisms of summer monsoon onset over the South China Sea (SCS) are investigated. Results show that SCS and its vicinity summer monsoon can be divided into three phrases with different characteristics. SST of SCS increases to its maximum suddenly before SCS summer monsoon onset. The conversion of sensible heat flux between sea and land may be an important factor that induces onsets of East Asia subtropical monsoon and SCS monsoon.
- SCS;
- Summer monsoon;
- Onset features;
- Mechanism analysis;

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References(18)

Figures and Tables

图 1 1998年1~8月华南及南海地区降水突变的时间分布图

(等值线数值是从1月1日开始计算的天数)

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图 2 江南中部雨量、OLR、925 hPa实际风、正压风和斜压风时间演变图

a :雨量, b :OLR, c:实际纬向风, d :实际经向风, e:正压纬向风, f :正压经向风, g :斜压纬向风, h :斜压经向风

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图 3 1998年850 hPa第17候至30候的逐候候平均实际风环流图

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图 4 1998年850 hPa第17候至30候的逐候候平均斜压环流图

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图 5 南海东北部雨量、OLR、925 hPa实际风、正压风和斜压风时间演变图

(a :雨量, b:OLR, c :实际纬向风, d :实际经向风, e :正压纬向风, f :正压经向风, g :斜压纬向风, h :斜压经向风)

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图 6 1998年南海夏季风爆发前后的海温 (粗实线)、西风分量 (细实线) 和降水率 (虚线) 演变图

(单位:(按Y轴顺序) S ST (℃), 西风 (m/ s), 降水率 (10 ^-4kg·m ^-2·s ^-1))

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图 7 1998年100°~135°E内OLR及500 hPa纬向风速为0线的时间-纬度剖面图

(阴影区:OLR≥245 W/ m², 粗实线:500 hPa纬向风速为0线)

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图 8 1998年110°~120°E区域潜热通量 (a) 和感热通量 (b) 变化的时间-纬度剖面图 (单位:W/ m²)

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