大氣熱源年代際異常與20世紀70年代末期東亞夏季風年代際減弱

doi:10.3969/2015jms.0064

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大氣熱源年代際異常與20世紀70年代末期東亞夏季風年代際減弱
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                        10.3969/2015jms.0064
                    
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基金項目:公益性行業(yè)(氣象)科研專項(GYHY200806004,GYHY201106017);國家自然科學基金資助項目(41330420);江蘇省氣象科學研究基金重點項目(KZ201402)

Interdecadal anomaly of atmospheric diabatic heating and interdecadal weakening of East Asian summer monsoon at the end of 1970s

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利用1958-2001年ERA-40再分析資料計算大氣熱源,統(tǒng)計分析了亞洲季風區(qū)及其鄰近海域大氣熱源年代際變異的典型模態(tài);利用線性斜壓干模式,模擬了夏季大氣對大氣熱源年代際異常的響應(yīng),揭示了大氣熱源年代際異常與1970s末期東亞夏季風年代際減弱的關(guān)系。結(jié)果表明:近50 a來亞洲及其鄰近海域夏季整層大氣熱源變異主要表現(xiàn)為年代際變化特征,其年代際位相轉(zhuǎn)換發(fā)生在1970s中后期,這與東亞夏季風年代際減弱的時間一致;菲律賓附近海域和中國西南地區(qū)是與東亞夏季風年代際減弱有直接聯(lián)系的兩個熱源異常關(guān)鍵區(qū);東亞夏季風年代際減弱最直接地表現(xiàn)為這兩個關(guān)鍵區(qū)熱源異常的共同作用,而赤道中東太平洋、赤道印度洋大氣熱源增強則通過大氣遙響應(yīng)機制影響菲律賓附近海域低層大氣環(huán)流異常對東亞夏季風變異起相反的貢獻。

Abstract:

Based on the ERA-40 reanalysis data from 1958 to 2001, the seasonal atmospheric diabatic heating was calculated, and the typical pattern of interdecadal variability of the atmospheric diabatic heating over East Asian summer monsoon (EASM) area and its adjecent sea areas was indentified. Furthermore, by using the global atmospheric baroclinic dry model, the steady atmospheric response to the interdecadal diabatic heating anomaly was simulated, and the relation between the interdecadal anomaly of atmospheric diabatic heating and the weakening of EASM at the end of 1970s was revealed. Results show that over the past 50 years, the vertically-integrated atmospheric diabatic heating variations over the Asia and its adjecent sea areas during summer are mainly characterized by interdecadal variations with an interdecadal transition occoured at the end of 1970s, whose occurring time is consistent with the phase change of the EASM weakening. The Philippine Sea and Southwest China are two key regions of significant diabatic heating anomalies that are directly related to the EASM weakening. The interdecadal weakening of EASM is directly associated with the joint effect of the above two key regions. The enhanced diabatic heating over equatorial eastern and central Pacific and equtorial Indian Ocean can cause opposite EASM anomaly by remotely affecting low-level atmospheric circulation over the Philippine Sea.

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張靈玲,謝倩,楊修群.大氣熱源年代際異常與20世紀70年代末期東亞夏季風年代際減弱.氣象科學,2015,35(6):663-671 ZHANG Lingling, XIE Qian, YANG Xiuqun. Interdecadal anomaly of atmospheric diabatic heating and interdecadal weakening of East Asian summer monsoon at the end of 1970s. Journal of the Meteorological Sciences,2015,35(6):663-671

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收稿日期:2015-01-24
最后修改日期:2015-03-30
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