亞澳"大陸橋"地區(qū)降水和對(duì)流的季節(jié)變化及其與海溫的關(guān)系

doi:10.3969/2012jms.00**

首頁 > 過刊瀏覽>2004年第卷第4期 >379-386. DOI:10.3969/2012jms.00**

亞澳"大陸橋"地區(qū)降水和對(duì)流的季節(jié)變化及其與海溫的關(guān)系
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                        10.3969/2012jms.00**
                    
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中圖分類號(hào):P461、2
基金項(xiàng)目:國家自然科學(xué)基金項(xiàng)目 (40 30 5 0 0 5 )和 (40 135 0 2 0 )共同資助

SEASONAL CHANGES OF PRECIPITATION AND CONVECTION OVER ASIAN-AUSTRALIAN "LAND BRIDGE" AREAS AND ITS RELATIONSHIP WITH SST

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使用日本氣象廳提供的1980～1997年TBB資料、NCEP／NCAR40a再分析資料及(2MAP降水資料，分析了亞澳“大陸橋”地區(qū)降水和對(duì)流活動(dòng)特征及其影響因子，發(fā)現(xiàn)蘇門答臘地區(qū)降水和對(duì)流具有明顯的季節(jié)變化。4月底～5月初(25候)雨區(qū)沿“大陸橋”和中南半島西海岸迅速北移，對(duì)流也有類似特征，正是對(duì)流移動(dòng)的突然加速，對(duì)隨后中南半島對(duì)流增強(qiáng)有直接影響。進(jìn)一步研究表明，蘇門答臘地區(qū)對(duì)流的強(qiáng)(弱)與海溫異常及緯圈環(huán)流的變化相聯(lián)系，由于正好位于兩個(gè)熱力直接環(huán)流(Walker和反Walker)耦合區(qū)的蘇門答臘地區(qū)對(duì)

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Based on 1980-1997 TBB data from GMS of Japan, NCEP/NCAR reanalysis data (1958-1997) and 1980-1997 precipitation data from CMAP, an investigation is carried out of seasonal changes of precipitation and convection over Asian-Australian "land bridge" areas and its relationship with SST. The results show that the precipitation and convection over Sumatra take on clearly seasonal changes with abundant (less) rainfall in winter (summer). The rainband over Sumatra moves northwestward rapidly along "land bridge" in late-April and early-May (the 25thpentad) and the convection shows similar variations. It is the accelerating of the convection that affects directly the subsequent enhancement of the convection over Indo-China Peninsula area. The further study suggests that the intensity of Sumatra convection has a close relation to the SSTA and Zonal vertical circulations: the strengthening of the convection over "land bridge" which lies just at the coupling point of two thermal direct circulation (Walker and anti-Walker circulation) leads to a corresponding enhancing of updraft of vertical circulations, or even a corresponding enhancing of the whole zonal circulation followed by the strengthening of the equatorial westerly, which might influence the onset of the Indo-China Peninsula convection.

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王黎娟,何金海,管兆勇,溫敏.亞澳"大陸橋"地區(qū)降水和對(duì)流的季節(jié)變化及其與海溫的關(guān)系.氣象科學(xué),2004,(4):379-386 Wang Lijuan, He Jinhai, Guan Zhaoyong, Wen Min. SEASONAL CHANGES OF PRECIPITATION AND CONVECTION OVER ASIAN-AUSTRALIAN "LAND BRIDGE" AREAS AND ITS RELATIONSHIP WITH SST. Journal of the Meteorological Sciences,2004,(4):379-386

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收稿日期:2004-03-05
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