南亞高壓次季節(jié)尺度東西振蕩對我國長江流域降水及水汽輸送的影響

doi:10.3969/2018jms.0082

首頁 > 過刊瀏覽>2019年第39卷第6期 >711-720. DOI:10.3969/2018jms.0082

南亞高壓次季節(jié)尺度東西振蕩對我國長江流域降水及水汽輸送的影響
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                        10.3969/2018jms.0082
                    
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基金項目:國家重點研發(fā)計劃（2018YFC1505903）；國家自然科學基金資助項目（41675067；41621005）

The influence of subseasonal zonal oscillation of South Asian High on precipitation and moisture transportation over Yangtze River Valley

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使用常規(guī)資料及HYSPLIT（Hybrid Single Particle Lagrangian Integrated Trajectory Model）模式，分析了早夏和晚夏期間南亞高壓次季節(jié)尺度異常偏東事件和異常偏西事件發(fā)生時，我國長江流域降水及水汽輸送異常特征。結果表明：早夏期間當南亞高壓異常東伸時，西太平洋副熱帶高壓可西伸至我國東南沿岸，此時，降水正異常場主要位于我國東部地區(qū)，表現(xiàn)為江淮區(qū)域降水異常偏多；而晚夏期間當南亞高壓異常東伸時，西太平洋副熱帶高壓的西脊點更偏東，降水正異常區(qū)位置比早夏偏西，表現(xiàn)為四川盆地的降水異常偏多。早夏期間，與南亞高壓異常偏西事件相比，南亞高壓異常偏東事件有利于更多的水汽從南方的水汽源地輸送到我國江淮區(qū)域，加上此時江淮流域存在異常上升運動，動力和水汽條件共同使得江淮流域降水偏多。晚夏四川盆地地區(qū)有類似的結論。

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Using regular datasets and HYSPLIT(Hybrid Single Particle Lagrangian Integrated Trajectory Model) model, this paper investigated the characteristics of precipitation and water vapor transport in Yangtze River Valley(YRV) during anomalous eastward and westward extension events of South Asian High(SAH) on sub-seasonal time scales in early and late summers. The results show that when SAH extended eastward during early summer, the western Pacific subtropical high stretch would extend westward towards East Asian land area. In the meantime, the positive rainfall was anomaly located in eastern China with enhanced precipitation in Yangtze-Huaihe River Valley(YHRV). However, when SAH extended eastward in the late summers, the west ridge point of Western Pacific Subtropical High(WPSH) was further eastward and the positive rainfall anomaly moved more westward to middle China than in early summers, inducing the enhanced precipitation in Sichuan Basin. In the early summers, compared with the SAH's westward extension events, the SAH's eastward extension events were more conducive to water vapor transportation from south China to YHRV. The associated anomalous upward motion in YHRV together with the water vapor conditions led to the enhanced rainfall in this region. Results over Sichuan Basin in late summers were similar.

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葛家榮,任雪娟.南亞高壓次季節(jié)尺度東西振蕩對我國長江流域降水及水汽輸送的影響.氣象科學,2019,39(6):711-720 GE Jiarong, REN Xuejuan. The influence of subseasonal zonal oscillation of South Asian High on precipitation and moisture transportation over Yangtze River Valley. Journal of the Meteorological Sciences,2019,39(6):711-720

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收稿日期:2018-06-03
最后修改日期:2018-08-18
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在線發(fā)布日期: 2020-01-07
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