中國主要城市群在灰霾污染下的近地面風(fēng)場特征

doi:10.12306/2020jms.0009

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中國主要城市群在灰霾污染下的近地面風(fēng)場特征
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                        10.12306/2020jms.0009
                    
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中圖分類號:X513
基金項(xiàng)目:國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2016YFC0200501）；國家自然科學(xué)基金資助項(xiàng)目（41975006）

Characteristics analysis on near-surface wind field under haze pollution conditions in major urban agglomerations of China

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利用2015—2016年全國PM_2.5質(zhì)量濃度站點(diǎn)資料及CCMP（Cross Calibrated Multi-Platform）風(fēng)場再分析資料，對中國華北、長三角、珠三角以及四川盆地主要城市在PM_2.5污染下的近地面風(fēng)場及其影響進(jìn)行統(tǒng)計(jì)分析。結(jié)果表明：（1）近地面風(fēng)速與PM_2.5質(zhì)量濃度表現(xiàn)為負(fù)相關(guān)，低風(fēng)速有利于PM_2.5的積累，但是該相關(guān)關(guān)系并不完全顯著，體現(xiàn)出"冬強(qiáng)夏弱"的季節(jié)性差異；（2）不同地區(qū)PM_2.5質(zhì)量濃度對不同風(fēng)向的反應(yīng)不同，華北地區(qū)在偏南風(fēng)主導(dǎo)下PM_2.5質(zhì)量濃度較高，長三角則是在偏西風(fēng)主導(dǎo)下PM_2.5質(zhì)量濃度較高，而珠三角地區(qū)冬季PM_2.5質(zhì)量濃度較高，主導(dǎo)風(fēng)向?yàn)槠憋L(fēng)；（3）通過分析地面散度場發(fā)現(xiàn)不同地區(qū)主導(dǎo)的污染類型不同，華北地區(qū)、長三角以及珠三角污染類型主要為區(qū)域性污染，四川盆地主要為局地型污染。

Abstract:

Based on the observed PM_2.5 concentration data and the wind field obtained from CCMP (Cross Calibrated Mulit-Platform) reanalysis data from 2015 to 2016, the characteristics and effects of near-surface wind field in North China, Yangtze River Delta, Pearl River Delta and Sichuan Basin under PM_2.5 pollution conditions were investigated. Results show that: (1) near-surface wind speed is negatively correlated with PM_2.5 concentration. Low wind speed contributes to the accumulation of PM_2.5, but the correlation is not completely significant, which reflects the "strong in winter and weak in summer" seasonal difference. (2) Different regions have different responses to PM_2.5 concentrations under different wind directions. In North China, PM_2.5 concentration is high when southerly wind dominates. While the PM_2.5 concentration in the Yangtze River Delta is high dominated by the westerly wind. In the Pearl River Delta, the dominant wind direction in winter is northerly. (3) By analyzing the characteristics of surface convergence and divergence field, it is found that the type of pollution in different regions are various. The pollution types in North China, Yangtze River Delta and Pearl River Delta are mainly regional pollution while the pollution in Sichuan Basin is mainly local and the external transportation has little influence on it.

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劉馨尹,張寧.中國主要城市群在灰霾污染下的近地面風(fēng)場特征.氣象科學(xué),2021,41(3):304-313 LIU Xinyin, ZHANG Ning. Characteristics analysis on near-surface wind field under haze pollution conditions in major urban agglomerations of China. Journal of the Meteorological Sciences,2021,41(3):304-313

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收稿日期:2019-11-11
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在線發(fā)布日期: 2021-07-05
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