基于ERA5再分析資料對(duì)2020年6月江淮區(qū)域水汽源匯的診斷分析

doi:10.12306/2021jms.0086

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基于ERA5再分析資料對(duì)2020年6月江淮區(qū)域水汽源匯的診斷分析
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                        10.12306/2021jms.0086
                    
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中圖分類號(hào):P458.121
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2019YFC1510201);上海市"科技創(chuàng)新行動(dòng)"攻關(guān)項(xiàng)目(20dz1200401);上海市氣象局面上項(xiàng)目(MS202005);中國(guó)氣象局預(yù)報(bào)員專項(xiàng)(CMAYBY2020-040)

Diagnostic study of moisture sources and sinks over the Yangtze-Huaihe River Basin in June 2020 based on ERA5 reanalysis data

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摘要:

2020年6月,我國(guó)江淮區(qū)域出現(xiàn)大范圍持續(xù)性強(qiáng)降水過(guò)程,并引發(fā)了洪澇災(zāi)害。利用ERA5再分析資料對(duì)江淮區(qū)域的水汽收支平衡進(jìn)行分析,并利用HYSPLIT后向軌跡模式分析了其水汽源地。結(jié)果表明:(1)ERA5再分析資料能較好地描述本次過(guò)程中江淮區(qū)域的水汽收支特征,其中水汽輻合項(xiàng)為主要貢獻(xiàn)項(xiàng),對(duì)水汽匯有較好的指示作用,同時(shí),降水和水汽匯之間保持了較好的一致性變化。(2)南海是江淮區(qū)域6月持續(xù)性降水最主要的水汽源地,約50%的水汽來(lái)自南海。(3)6月江淮區(qū)域降水分布與水汽的輸送密切相關(guān),而水汽輸送主要取決于西太平洋副熱帶高壓的位置及其與北側(cè)冷渦活動(dòng)的共同作用。

Abstract:

In June 2020, the large-scale continuous heavy precipitation processes occurred in the Yangtze-Huaihe River Basin (YHRB) of China, which caused flood disaster. In this study, the moisture budget in the YHRB was diagnosed and analyzed by using ERA5 reanalysis data, and the water vapor source was analyzed by HYSPLIT backward trajectory model. Results show that:(1) the characteristics of water vapor budget in the YHRB during this process can be well described by the ERA5 reanalysis data. The moisture convergence is the main contribution term, which is a good indicator on the water vapor sink. Meanwhile, there is a good consistency between precipitation and water vapor sink. (2) The South China Sea is the most important water vapor source for the persistent precipitation in the YHRB in June, and about 50% of the water vapor comes from here. (3) The distribution of precipitation in the YHRB in June is closely related to moisture transport, while moisture transport mainly depends on the position of the western Pacific subtropical high and its interaction with the activity of cold vortex in the north.

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黃丁安,盧楚翰,孔陽(yáng),信飛,秦育婧.基于ERA5再分析資料對(duì)2020年6月江淮區(qū)域水汽源匯的診斷分析.氣象科學(xué),2022,42(1):44-50 HUANG Ding'an, LU Chuhan, KONG Yang, XIN Fei, QIN Yujing. Diagnostic study of moisture sources and sinks over the Yangtze-Huaihe River Basin in June 2020 based on ERA5 reanalysis data. Journal of the Meteorological Sciences,2022,42(1):44-50

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收稿日期:2021-01-15
最后修改日期:2021-10-20
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在線發(fā)布日期: 2022-06-01
出版日期: 2022-05-30

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