太湖及與湖岸城市間大氣顆粒物分布特征分析

doi:10.3969/2015jms.0078

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太湖及與湖岸城市間大氣顆粒物分布特征分析
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                        10.3969/2015jms.0078
                    
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基金項(xiàng)目:江蘇省青年科學(xué)基金項(xiàng)目（BK20150895）；南京信息工程大學(xué)人才啟動(dòng)基金項(xiàng)目

Characteristics analysis on distribution of particulate matters between lake shore cities and Taihu Lake

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利用冬季連續(xù)2 d在兩種氣象條件下分別環(huán)繞太湖對(duì)湖泊近無錫區(qū)域、湖心區(qū)域、近西山島區(qū)域和近蘇州區(qū)域近湖層的PM_0.5、PM_2.5和PM₁₀進(jìn)行質(zhì)量濃度觀測(cè)，并通過分析同期相應(yīng)氣象資料（包括高空和地面風(fēng)場(chǎng)、流場(chǎng)以及湖面站點(diǎn)的水平垂直風(fēng)向風(fēng)速等氣象數(shù)據(jù)），探討湖泊區(qū)域內(nèi)外顆粒物濃度變化的時(shí)空特征以及受氣象條件變化的影響。研究表明：第1天當(dāng)天氣為晴轉(zhuǎn)陰且無霧時(shí)，由于湖面本身缺乏密集強(qiáng)排放源，以及因湖面大氣上升運(yùn)動(dòng)較強(qiáng)使顆粒物容易被擴(kuò)散稀釋，且受偏東轉(zhuǎn)東南氣流所帶來的氣團(tuán)較干凈影響，湖面湖心區(qū)域和離島區(qū)域顆粒物濃度明顯低于上游城市；而在第2天當(dāng)天氣為霧時(shí)情況則相反，由于湖面大氣較弱的上升運(yùn)動(dòng)使得大氣顆粒物不容易被擴(kuò)散稀釋，且湖泊強(qiáng)大的水汽源影響有助于氣溶膠和顆粒物的生成進(jìn)而使得湖面顆粒物濃度大于周圍城市。此外還發(fā)現(xiàn)在兩種天氣下，顆粒物濃度都存在無錫區(qū)域最高，湖心區(qū)域次之，蘇州區(qū)域較低的特征。并且，在霧天不同粒徑顆粒物間變化的相關(guān)系數(shù)更高。

Abstract:

Based on the concentration observation data of PM_0.5, PM_2.5 and PM₁₀ on surface layer of four areas in Taihu lake as Wuxi, Xishan island, Suzhou, and the central lake area in two days within two kinds of meteorological parameters. Moreover, through analyzing the corresponding meteorological data in the same period including wind field, flow field and horizontal, vertical wind direction and speed, the spatial-temporal variation characteristics of particles in Taihu lake and the influence of meteorological parameters were discussed. Results show that in sunny but cloudy day without fog, the particulate concentration in the lake area and outlying island regions are significantly lower than that in the city, it is because the particles would be easily to spread and dilute by ascending motion. Meanwhile, there is no strong emission on lake and the air flow from the east and the southeast will bring purer air mass; while in foggy day, under the static and stable meteorological condition with weak ascending motion, the strong vapor source of lake and stable weather condition facilitates the genesis and accumulation of aerosol and particles, which makes the different condition compared with the day without fog. In addition, the feature of spatial variation of particle concentration is characterized as follows:it is the highest in lake near Wuxi area, it is higher in the central lake than that near Suzhou area. The correlation coefficient of concentration among three sizes of particles is the highest in foggy day.

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湯天然,袁馬強(qiáng),曹芳.太湖及與湖岸城市間大氣顆粒物分布特征分析.氣象科學(xué),2016,36(6):819-825 TANG Tianran, YUAN Maqiang, CAO Fang. Characteristics analysis on distribution of particulate matters between lake shore cities and Taihu Lake. Journal of the Meteorological Sciences,2016,36(6):819-825

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收稿日期:2015-08-07
最后修改日期:2015-09-29
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在線發(fā)布日期: 2017-01-07
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