中緯度瞬變渦旋活動對東亞夏季平均環(huán)流和降水的影響

doi:10.12306/2021jms.0034

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中緯度瞬變渦旋活動對東亞夏季平均環(huán)流和降水的影響
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                        10.12306/2021jms.0034
                    
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中圖分類號:P426.62
基金項目:國家自然科學(xué)基金資助項目（41875086）；國家重點研發(fā)計劃項目（2018YFC1505902）

The influence of mid-latitude transient eddy activities on the summer mean circulation and precipitation in East Asia

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首先利用CFSR再分析數(shù)據(jù),分析了東亞夏季平均環(huán)流結(jié)構(gòu)及瞬變渦旋活動特征,再通過WRF模式設(shè)計控制性試驗和敏感性試驗分別模擬受到/不受到來自北邊界中緯度瞬變渦旋活動影響的東亞夏季環(huán)流和降水,通過兩組試驗對比揭示了瞬變渦旋活動對東亞夏季平均環(huán)流和降水的貢獻(xiàn)。結(jié)果表明,中緯度瞬變渦旋活動可以通過系統(tǒng)性的輸送動量、熱量、水汽和渦度來改變背景場,從而影響夏季平均環(huán)流和降水。當(dāng)中緯度瞬變渦旋活動大幅度減弱時,其產(chǎn)生的向極動量、熱量和水汽輸送也顯著減弱。一方面向北熱量和水汽輸送的減少使東亞東部大陸上低層的平均溫度和水汽增加,為降水提供了環(huán)流不穩(wěn)定條件和水汽條件,另一方面瞬變渦旋的動力輸送變化在環(huán)流場上形成相當(dāng)正壓結(jié)構(gòu)響應(yīng),整個中國東部地區(qū)受強西南風(fēng)控制,東亞夏季風(fēng)增強并推進(jìn)到更北的區(qū)域。這兩個因素的共同作用使我國北部地區(qū)和華南地區(qū)產(chǎn)生了水汽輻合和對流增強,導(dǎo)致該地區(qū)降水的增強。

Abstract:

Based on the CFSR reanalysis data, the structure of summertime mean circulation and the characteristics of transient eddy activities in East Asia were firstly analyzed. Then by using the WRF model, a control run and a sensitivity run were designed to simulate the East Asian mean circulation and precipitation in summer that with/without the influence of the mid-latitude transient eddy activities from the northern boundary, respectively. The comparison between the two sets of runs reveals the contribution of transient eddy activities in the mid-latitudes to the East Asia summertime mean circulation and precipitation. Results show that the mid-latitude transient eddy activities can change the background field by systematically transporting momentum, heat, moisture and vorticity, thereby affecting the mean circulation and precipitation in summer. When the mid-latitude transient eddy activities are greatly weakened, their induced poleward momentum, heat and water vapor flux transportation are also significantly weakened. On one hand, the decreasing of poleward heat and water vapor flux transportation increases the mean temperature and water vapor in the lower layers in the eastern continent of East Asia, which provides unstable conditions and moisture conditions for precipitation. On the other hand, the change of transient eddy dynamic transportation causes an equivalent-barotropic structure response in the circulation field. The entire eastern part of China is controlled by stronger southwesterly, thus the East Asian summer monsoon strengthens and extends to further north. The combined effect of these two factors results in moisture convergence and enhanced convection in the northern and southern parts of eastern China, leading to increasing of precipitation in this area.

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林昊雄,房佳蓓,胡海波,楊修群.中緯度瞬變渦旋活動對東亞夏季平均環(huán)流和降水的影響.氣象科學(xué),2021,41(6):739-751 LIN Haoxiong, FANG Jiabei, HU Haibo, YANG Xiuqun. The influence of mid-latitude transient eddy activities on the summer mean circulation and precipitation in East Asia. Journal of the Meteorological Sciences,2021,41(6):739-751

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收稿日期:2020-12-19
最后修改日期:2021-03-14
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在線發(fā)布日期: 2022-01-10
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