東亞—西北太平洋地區(qū)夏季季節(jié)內(nèi)振蕩的年代際變化

doi:10.12306/2020jms.0060

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東亞—西北太平洋地區(qū)夏季季節(jié)內(nèi)振蕩的年代際變化
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                        10.12306/2020jms.0060
                    
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中圖分類號(hào):P433
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2018YFC1505902);國(guó)家自然科學(xué)基金重大研究計(jì)劃重點(diǎn)支持項(xiàng)目(91837206);國(guó)家自然科學(xué)基金資助項(xiàng)目(41375076)

Decadal change in the boreal summer intraseasonal oscillation over the East Asian-Western North Pacific

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本文重點(diǎn)分析對(duì)比熱帶夏季季節(jié)內(nèi)振蕩(Boreal Summer Intraseasonal Oscillation,BSISO)1987—1995年(P1),1996—2007年(P2)和2008—2017年(P3)三階段東亞—西北太平洋地區(qū)(East Asian-Western North Pacific,EAWNP)5—9月BSISO年代際變化的季節(jié)內(nèi)差異特征。結(jié)果表明,在P1和P3兩階段,5—7月EAWNP BSISO強(qiáng)度幾乎相同,但P2中每個(gè)月均顯著增強(qiáng),表明5—7月EAWNP BSISO經(jīng)歷了P1—P2增強(qiáng)和P2—P3減弱的年代際變化。8月,EAWNP BSISO強(qiáng)度從P1到P3逐漸增強(qiáng),P3階段比P1有顯著增強(qiáng),孟加拉灣和東亞副熱帶區(qū)域的BSISO活動(dòng)增強(qiáng)。和P1相比,南海地區(qū)BSISO活動(dòng)在P2階段異?；钴S,在5—7月強(qiáng)度增強(qiáng),并且北傳顯著。在P2階段,負(fù)位相的太平洋年代際(Interdecadal Pacific Oscillation,IPO)對(duì)應(yīng)的赤道西太平洋和印度洋海溫增暖,及Walker環(huán)流的增強(qiáng)為5—7月BSISO活動(dòng)提供了水汽和對(duì)流發(fā)展的有利條件,而南海地區(qū)北傳對(duì)流的疊加作用以及南海海溫增暖進(jìn)一步加強(qiáng)了BSISO的強(qiáng)度和北傳。在P3階段,8月孟加拉灣BSISO活動(dòng)增強(qiáng),除了熱帶印度洋一致增暖和太平洋ENSO型海溫為BSISO活動(dòng)提供水汽和對(duì)流發(fā)展的條件外,70°~90°E區(qū)域局地Hadley環(huán)流引起的上升運(yùn)動(dòng)也對(duì)BSISO的強(qiáng)度增強(qiáng)和北傳有貢獻(xiàn)。

Abstract:

This study instead focuses on the intraseasonal diversity of Boreal Summer Intraseasonal Oscillation (BSISO) decadal changes over the East Asia-Western North Pacific region (EAWNP) based on the comparisons between the three periods such as 1987-1995(P1),1996-2007(P2)and 2008-2017(P3)from May to September. Results indicate that a significant decadal enhanced (weakened) shift of EAWNP BSISO on May, June and July were detected from P1 to P2 (P2 to P3). Convection in the BSISO was active and propagated further northward in P2 over the South China Sea (SCS) during May-July. In August, EAWNP BSISO has enhanced from P1 to P2 and from P2 to P3, and the BSISO is most active over the subtropical area of East Asia in P3. During P2, the Sea Surface Temperature (SST) warming over the equatorial western Pacific and Indian Ocean associated with the negative phase of the Interdecadal Pacific Oscillation (IPO) and enhanced Walker circulation supplies favorable condition as moisture and the growth of the convection, and the merging process of the convection over SCS and the warmer SST in this region lead to the further enhancement and north-ward propagation of the BSISO. During P3, the BSISO is most active over the Bay of the Bengal on August. The Basin wide scale warming of SST in tropical Indian and western Pacific Oceans is benefit for the moisture supply and convective activity, and the ascending anomalies associated with the local Hadley circulation between 70°-90°E contributes to the growth of the BSISO and its northward propagation.

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葉韞盛,姚永紅,吳其岡.東亞—西北太平洋地區(qū)夏季季節(jié)內(nèi)振蕩的年代際變化.氣象科學(xué),2022,42(3):311-323 YE Yunsheng, YAO Yonghong, WU Qigang. Decadal change in the boreal summer intraseasonal oscillation over the East Asian-Western North Pacific. Journal of the Meteorological Sciences,2022,42(3):311-323

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收稿日期:2020-06-02
最后修改日期:2020-06-22
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在線發(fā)布日期: 2022-07-15
出版日期: 2022-06-25

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