回流作用對(duì)江淮地區(qū)兩次浮塵天氣過(guò)程影響的差異研究

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回流作用對(duì)江淮地區(qū)兩次浮塵天氣過(guò)程影響的差異研究
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中圖分類(lèi)號(hào):X513
基金項(xiàng)目:江蘇省青年基金資助項(xiàng)目(KQ202409;KQ202324)

A comparative study on the influence of the reflux effect on the two dust weather in the Jianghuai region

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本文以2021年3月16、28日兩次沙塵天氣為例,利用地面常規(guī)氣象觀測(cè)資料、氣象再分析資料,結(jié)合氣溶膠激光雷達(dá)、風(fēng)廓線雷達(dá)、HYSPLIT模型等分析了影響江淮地區(qū)的兩次沙塵天氣發(fā)生時(shí)天氣系統(tǒng)、顆粒物濃度、氣溶膠光學(xué)特性和邊界層氣象條件變化等特征,特別探討了回流作用的影響。結(jié)果表明:兩次均為浮塵天氣,與暖區(qū)新生類(lèi)蒙古氣旋的活動(dòng)有關(guān)。對(duì)江淮地區(qū)的影響分為冷鋒后部污染物影響和高壓后部污染物回流影響。前者容易引發(fā)單峰型2~4 h污染物爆發(fā)性增長(zhǎng),后者對(duì)應(yīng)多峰型7~9 h污染物持續(xù)增長(zhǎng),最終產(chǎn)生1 000 μg·m^-3以上的嚴(yán)重污染。污染物均來(lái)源于蒙古和貝加爾湖,經(jīng)過(guò)華北后傳輸高度降低至1 km以下,回流階段的傳輸高度較低,僅為0.3 km左右。傳輸層風(fēng)速加強(qiáng)至8~14 m·s^-1有利于污染物在地面的長(zhǎng)時(shí)間影響。

Abstract:

This paper takes two sandstorms on March 16 and 28, 2021 as examples, by using conventional ground meteorological observation data and meteorological reanalysis data, combined with aerosol lidar, wind profile radar, HYSPLIT model, etc., the weather system, particle concentration, aerosol optical characteristics, and boundary layer meteorological conditions that affect the occurrence of the two sandstorms in the Jianghuai region were analyzed. In particular, the influence of reflux was explored. Results indicate that both times were dust prone weather, which is related to the activity of newly formed Mongolian cyclones in warm regions. The impact on the Jianghuai region can be divided into the influence of pollutants in the rear of the cold front and pollutants in the back of the high pressure. The former is prone to single-peak rapid growth of pollutants within 2-4 hours, while the latter corresponds to multi-peak continuous growth of pollutants within 7-9 hours, eventually leading to severe pollution levels exceeding 1 000 μg·m^-3. The pollutants originate from Mongolia and Baikal, and after passing through North China, the transport height decreases to below 1 km, with even lower transport heights of 0.3-0.6 km during the reflux flow phase. An increase in the wind speed at the transport level to 8-14 m·s^-1 is beneficial for the long-term dispersion of pollutants at the ground level.

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王蓓元,謝真珍,安禮政,宋昊冬,肖晨.回流作用對(duì)江淮地區(qū)兩次浮塵天氣過(guò)程影響的差異研究.氣象科學(xué),2024,44(2):338-348 WANG Beiyuan, XIE Zhenzhen, AN Lizheng, SONG Haodong, XIAO Chen. A comparative study on the influence of the reflux effect on the two dust weather in the Jianghuai region. Journal of the Meteorological Sciences,2024,44(2):338-348

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收稿日期:2023-04-27
最后修改日期:2023-10-09
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在線發(fā)布日期: 2024-05-17
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