Impact of the preceding-summer heat content over western Pacific warm pool on Spring Persistent Rain and its possible mechanism

Shang Ke; Zhan Fengxing; He Jinhai; Qi Li

doi:10.3969/j.issn.0253-4193.2014.01.010

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Shang Ke, Zhan Fengxing, He Jinhai, Qi Li. Impact of the preceding-summer heat content over western Pacific warm pool on Spring Persistent Rain and its possible mechanism[J]. Haiyang Xuebao, 2014, 36(1): 86-97. doi: 10.3969/j.issn.0253-4193.2014.01.010

Citation:

Shang Ke, Zhan Fengxing, He Jinhai, Qi Li. Impact of the preceding-summer heat content over western Pacific warm pool on Spring Persistent Rain and its possible mechanism[J]. Haiyang Xuebao, 2014, 36(1): 86-97. doi: 10.3969/j.issn.0253-4193.2014.01.010

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Impact of the preceding-summer heat content over western Pacific warm pool on Spring Persistent Rain and its possible mechanism

doi: 10.3969/j.issn.0253-4193.2014.01.010

1.
Key Laboratory of Meteorological Disaster of Ministry of Education, NUIST, Nanjing 210044, China
2.
Key Laboratory of Meteorological Disaster of Ministry of Education, NUIST, Nanjing 210044, China;Jiangxi Provincial Meteorological Bureau, Nanchang 330046, China
3.
Key Laboratory of Meteorological Disaster of Ministry of Education, NUIST, Nanjing 210044, China;Jilin Meteorological Science Institute, Laboratory of Research for Middle-High Latitude Circulation and East Asian Monsoon, Changchun 130062, China

Received Date: 2013-01-12

Abstract

Abstract

In this paper, the impact of the preceding-summer heat content over western Pacific warm pool on Spring Persistent Rain was analyzed based on the GODAS monthly mean sea temperature, China 753 stations precipitation and NCEP/NCAR daily reanalysis data. Possible process and mechanism were studied through anomalous circulation in upper and low level. Major results were: (1) Heat content over key region(9°~16°N,150°~166°E) in preceding-summer was anti-correlated with the intensity of SPR. The significant low heat content in preceding-summer strongly indicated surplus rainfall in spring. (2)Difference field (rainy years minus drought years) in spring was consistent with spring circulation regressed by the heat content(opposite sign) in preceding-summer over warm pool. Direct causes of surplus rainfall were warm and wet southwest airflow in the low level, which located in northwest of the anomalous Philippine Sea anticyclone, and the pumping effect over Jiang Nan in upper level. (3)The anomalous low heat content over key region in preceding-summer induced low-level anomalous anticyclone in northwest, which persisted to current spring from preceding-summer. In spring, driven by the anomalous anticyclone, powerful southwest flow carried abundant moisture to Jiang Nan. Meanwhile, anomalous cyclone of upper level over mainland of China was stimulated and lasted from preceding-autumn to current spring. The anomalous cyclone led to southward replacement of westerly jet axis and formation of the abnormal divergence center with intense pumping effect in the upper level, hence resulting in surplus rainfall in spring. Process of abnormally less rainfall in spring caused by anomalous high heat content in pre-summer was on the contrary.
- preceding-summer,
- western Pacific warm pool,
- heat content,
- Spring Persistent Rain,
- possible mechanism

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References(40)

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