夏季東亞高空急流與太平洋-日本遙相關(guān)型的關(guān)系

doi:10.3969/2015jms.0051

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夏季東亞高空急流與太平洋-日本遙相關(guān)型的關(guān)系
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                        10.3969/2015jms.0051
                    
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基金項目:國家自然科學(xué)基金資助項目(41130963);公益性行業(yè)(氣象)科研專項(GYHY201306025);江蘇省氣候變化協(xié)同創(chuàng)新中心項目

The relationship of summertime upper level jet over East Asia and the Pacific-Japan teleconnection

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摘要:

利用NCEP/NCAR和NOAA月平均資料,采用奇異值分解方法分析了夏季東亞高空緯向風(fēng)場和西北太平洋海表溫度(SST)的耦合關(guān)系,并據(jù)此研究了東亞副熱帶高空急流和太平洋-日本(Pacific-Japan,PJ)遙相關(guān)型的可能聯(lián)系。合成分析結(jié)果表明,東亞副熱帶高空急流正模態(tài)年,急流偏南偏強(qiáng),對流層上層南亞高壓增強(qiáng)東進(jìn),中層西太平洋副熱帶高壓加強(qiáng)西伸,菲律賓周邊海域SST升高,中緯度黑潮延伸體區(qū)SST降低,菲律賓海和熱帶西太平洋地區(qū)對流活動偏弱,日本海和黑潮延伸體海區(qū)對流活動增強(qiáng),對應(yīng)PJ遙相關(guān)型的負(fù)位相;而東亞副熱帶高空急流負(fù)模態(tài)年,急流偏北偏弱,對流層上層南亞高壓減弱西退,中層西太平洋副熱帶高壓減弱東撤,菲律賓周邊SST降低,中緯度黑潮延伸體區(qū)SST升高,菲律賓海和熱帶西太平洋地區(qū)對流活動強(qiáng)盛,日本海和黑潮延伸體海區(qū)對流活動減弱,對應(yīng)PJ遙相關(guān)型的正位相。由于夏季東亞副熱帶高空急流活動與PJ遙相關(guān)型存在關(guān)聯(lián),PJ遙相關(guān)型可能是東亞副熱帶高空急流響應(yīng)太平洋海溫異常的紐帶。

Abstract:

The singular value decomposition (SVD) method is applied in this study to investigate the coupled mode between summertime upper-level zonal winds over East Asia and sea surface temperatures (SSTs) in the WesternNorth Pacific. Monthly means of wind fields, geopotential height, and vetical velocity from NCEP/NCAR reanalysis and SSTs from NOAA observations are used in this study. Possible relations between the upper-level jet stream over subtropical East Asia and the Pacific-Japan (PJ) teleconnection are explored. Results indicate that in the years of positive mode for the East Asian subtropical jet (EASJ), the EASJ intensified and shifted southward; the South Asian High in the upper troposphere intensified and extended eastward; the western Pacific subtropical high (WPSH) strengthened and extended westward in the mid-troposphere; SST warming occurred over the Philippine Sea while SST cooling was found in the Kuroshio Extension region; convective activities weakened over the Philippine Sea and the tropical western Pacific but intensified over the Japanese Sea and the Kuroshio Extension region in the mid-latitude. The positive mode years for the EASJ correspond to negative PJ phase. In the years of negative EASJ mode, the EASJ shifted northward and weakened; the South Asian High in the upper troposphere weakened and retreated westward; the WPSH in the mid-troposphere weakened and withdrew eastward; SST cooling was found over the Philippine Sea while SST warming occurred over the Kuroshio Extension region in the mid-latitude; convective activities intensified over the Philippine Sea and the tropical western Pacific but weakened over the Japanese Sea and the Kuroshio Extension region. The negative EASJ mode years correspond to positive PJ phase. Since the summertime upper-level jet stream activities over subtropical East Asia are closely related to the PJ teleconnection, it is possible that the PJ teleconnection behaves as a linkage between the EASJ activities and SST anomalies in the western North Pacific.

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鐘中,唐筱之,盧偉,陳中一.夏季東亞高空急流與太平洋-日本遙相關(guān)型的關(guān)系.氣象科學(xué),2015,35(6):672-683 ZHONG Zhong, TANG Xiaozhi, LU Wei, CHEN Zhongyi. The relationship of summertime upper level jet over East Asia and the Pacific-Japan teleconnection. Journal of the Meteorological Sciences,2015,35(6):672-683

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收稿日期:2015-03-16
最后修改日期:2015-06-21
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