青藏高原南側(cè)大氣熱源對江淮流域南北偶極型降水季節(jié)內(nèi)振蕩的調(diào)節(jié)

doi:10.12306/2022jms.0104

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青藏高原南側(cè)大氣熱源對江淮流域南北偶極型降水季節(jié)內(nèi)振蕩的調(diào)節(jié)
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                        10.12306/2022jms.0104
                    
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中圖分類號:P461.2
基金項目:國家自然科學基金重大研究計劃之重點支持資助項目(92158203);國家自然科學基金資助項目(42375045;41775047);江蘇省氣象局科研基金重點資助項目(KZ202102)

Modulation of the atmospheric heat source over the southern Tibetan Plateau on the intra-seasonal oscillation of the north-south dipolar precipitation in the Yangtze-Huaihe Valley

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基于1979—2018年我國臺站觀測的逐日降水和JRA-55大氣逐日再分析資料,本文分析了夏季江淮流域南北偶極型降水10~30 d季節(jié)內(nèi)振蕩(Intra-seasonal Oscillation,ISO)特征,并重點探討了青藏高原南側(cè)大氣熱源不同強度的加熱狀態(tài)對江淮流域南北偶極型降水ISO的峰值和谷值的調(diào)節(jié)作用。結(jié)果表明,當高原南側(cè)為強加熱狀態(tài),有利于增強江淮流域夏季降水的南澇北旱;而當高原南側(cè)為弱加熱狀態(tài),則易于加劇江淮流域的南旱北澇。這主要由于青藏高原南側(cè)異常強加熱,對流層低層異常熱低壓增強,加熱氣泵的抽吸效應(yīng)有利于孟加拉灣水汽向高原輻合。同時,高原南側(cè)的輻合上升運動又促使其對流層上層氣流輻散增強,導致自西向東傳播的歐亞遙相關(guān)波列的異常反氣旋性環(huán)流在抵達高原西部時,將向高原南側(cè)擴張并增強,進一步加劇上層氣流的輻散,加強對流層低層的水汽輸送,江淮流域南部充足的水汽供應(yīng)導致降水增強。此外,高原南側(cè)和孟加拉灣形成的北正南負的非絕熱加熱的經(jīng)向不均勻性分布,促使異常局地負渦源的產(chǎn)生,增強了孟加拉灣的反氣旋性環(huán)流外圍水汽向高原的輻合并轉(zhuǎn)向江淮南部。當高原南側(cè)為弱加熱狀態(tài)時,情況則相反。

Abstract:

On the basis of the station-based daily precipitation in China from 1979 to 2018 and the atmospheric fields from Japanese 55-year Reanalysis (JRA-55), this paper analyzed the characteristics of the 10-30-day Intra-seasonal Oscillation (ISO) of the north-south dipolar precipitation in the Yangtze-Huaihe Valley (YHV) in summer. In particular, the modulation of the atmospheric heat source over the southern Tibetan Plateau (TP) with different intensity was investigated on the peak and trough of ISO of the north-south dipolar precipitation in the YHV. It is found that strong (weak) heating over the southern TP induces enhanced floods (drought) in the southern YHV and drought (floods) in the northern YHV. The anomalous strong heating over the southern TP intensifies the anomalous warm low in the lower troposphere, with the pumping effect favorable to the water vapor from Bay of Bengal converging towards TP. Meanwhile, the converging and upward motion over the southern TP induces upper-level divergence. Thus, the anomalous anticyclonic circulation in the westward propagating Eurasian wavetrain is enhanced and expanded southward when reaching the northwestern TP, further strengthening the upper-level divergence, the water vapor transport in the low troposphere is strengthened, and the sufficient water vapor supply in the southern YHV leads to the enhanced precipitation. Moreover, the inhomogeneous meridional distribution of the adiabatic heating, i.e., positive over the southern TP and negative over the Bay of Bengal, results in genesis of the anomalous negative vorticity source and enhancement of water vapor from the periphery of anticyclonic circulation over the Bay of Bengal converging to TP and then veering towards the YHV. It is on the contrary when the anomalous heating over the southern TP is weak.

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孫嘉路,陳兵,王昊,鐘珊珊.青藏高原南側(cè)大氣熱源對江淮流域南北偶極型降水季節(jié)內(nèi)振蕩的調(diào)節(jié).氣象科學,2024,44(6):1061-1071 SUN Jialu, CHEN Bing, WANG Hao, ZHONG Shanshan. Modulation of the atmospheric heat source over the southern Tibetan Plateau on the intra-seasonal oscillation of the north-south dipolar precipitation in the Yangtze-Huaihe Valley. Journal of the Meteorological Sciences,2024,44(6):1061-1071

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收稿日期:2022-10-10
最后修改日期:2022-11-20
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在線發(fā)布日期: 2025-01-08
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