西太平洋副熱帶高壓西伸過(guò)程的合成特征及其可能機(jī)理

doi:10.3969/2012jms.00**

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西太平洋副熱帶高壓西伸過(guò)程的合成特征及其可能機(jī)理
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P463.1
基金項(xiàng)目:本文得到國(guó)家自然科學(xué)重點(diǎn)基金（編號(hào)：N0.40135020）資助

THE COMPOSITE FEATURES AND POSSIBLE MECHANISMS DURING THE WESTWARD EXTENSION OF SUBTROPICAL HIGH IN THE WESTERN PACIFIC

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利用1970~2000年6月NCEP/NCAR逐日再分析資料,根據(jù)(20~30°N,115~125°E)區(qū)域內(nèi)500 hPa的渦度變化選取了12次西太平洋副熱帶高壓西伸過(guò)程,合成了西太平洋副熱帶高壓西伸過(guò)程中對(duì)流層高層和低層的環(huán)流演變特征。結(jié)果表明,(20~30°N,115~125°E)區(qū)域內(nèi)500 hPa負(fù)渦度的增加對(duì)應(yīng)著西太平洋副熱帶高壓的西伸過(guò)程。在副熱帶高壓西伸過(guò)程中,對(duì)流層高層南亞高壓的中心位置雖然穩(wěn)定少動(dòng),但是由于日本東南部反氣旋的西移,使得南亞高壓東側(cè)的脊明顯地加強(qiáng)東伸,這可能對(duì)對(duì)流層中層副熱帶高壓的西伸具有重要作用。在對(duì)流層低層,源于澳大利亞北側(cè)的氣流越過(guò)赤道向北傳播,經(jīng)由南海季風(fēng)槽后到達(dá)我國(guó)江淮流域,從而影響副熱帶高壓西側(cè)的偏南氣流。

Abstract:

In terms of the NCEP/NCAR 1970～2000 daily reanalysis data in June, 12 westward extension processes of western Pacific Subtropical High are selected based on the variation of 500 hPa vorticity in the key area （20~30 °N,115~125 °E）. Through composite analysis, the features of the atmospheric circulation evolution from upper to low level of troposphere during the processes of westward extension of western Pacific Subtropical High are investigated in this paper. Results indicate that the increase of the negative vorticity in key area agrees with the westward extension of western Pacific Subtropical High. Another interesting phenomenon is found that the center of South Asia high in the upper level of troposphere is stabile and nearly motionless during the processes of the westward extension of western Pacific Subtropical High, but its eastern ridge strengthens and extends eastward remarkably because the anticyclone moves westward over the southeast Japan, which may lead to the westward extension of Subtropical High in the middle level of troposphere. In the low level of troposphere, the north Australia cold air activity plays an important role in the westward extension of Subtropical High. The flow propagates northward and marches across the equatior, then passes through the trough of summer monsoon over South China Sea and finally gets to the Yangtze River Valley, which sequentially affect the southwest airflow of the west side of Subtropical High.

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羅玲,何金海,譚言科.西太平洋副熱帶高壓西伸過(guò)程的合成特征及其可能機(jī)理.氣象科學(xué),2005,(5):465-473 Luo Ling, He Jinhai, Tan Yanke. THE COMPOSITE FEATURES AND POSSIBLE MECHANISMS DURING THE WESTWARD EXTENSION OF SUBTROPICAL HIGH IN THE WESTERN PACIFIC. Journal of the Meteorological Sciences,2005,(5):465-473

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