南京霾天顆粒物數(shù)濃度特征及其受氣象條件影響分析

doi:10.3969/2016jms.0035

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南京霾天顆粒物數(shù)濃度特征及其受氣象條件影響分析
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                        10.3969/2016jms.0035
                    
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基金項(xiàng)目:國家自然科學(xué)基金重點(diǎn)項(xiàng)目（D0512/91544231）；江蘇省環(huán)保科研課題（2015017）；江蘇省環(huán)境監(jiān)測科研基金項(xiàng)目（1016，1201）

Characteristics of the particulate number concentration and association with meteorological conditions during winter haze episode in Nanjing

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2013年12月，我國中東部地區(qū)爆發(fā)持續(xù)性霾污染過程。本研究利用空氣動(dòng)力學(xué)粒徑譜儀和氣溶膠粒徑譜儀在線觀測這次霾污染過程中13.6~20 000 nm顆粒物數(shù)濃度，結(jié)合氣象參數(shù)和顆粒物化學(xué)組分對南京霾天顆粒物數(shù)濃度分布特征，及其與氣象條件相關(guān)性進(jìn)行分析。結(jié)果表明，霾天顆粒物主要分布在積聚模態(tài)，且500~1 000 nm和1 000~2 500 nm粒徑段顆粒物數(shù)濃度的增多是造成霾天能見度低的主要原因；隨著相對濕度的增大，13.6~100 nm粒徑段顆粒物數(shù)濃度逐漸降低，而大于100 nm顆粒物數(shù)濃度升高；500~1 000 nm和1 000~2 500 nm粒徑段顆粒物數(shù)濃度受相對濕度的影響尤為明顯，并且這2個(gè)粒徑段顆粒物受氣態(tài)污染物（SO₂，NO_X）的二次轉(zhuǎn)化影響較大。霾污染期間南京大氣顆粒物主要來自南京東南和西北方向的污染源排放，顆粒物數(shù)濃度總體上與風(fēng)速呈負(fù)相關(guān)關(guān)系；溫度對顆粒物數(shù)濃度的影響主要集中在13.6~100 nm粒徑段；邊界層的高度與粒徑>100 nm顆粒物呈負(fù)相關(guān)性，邊界層的抬升反而利于超細(xì)粒子的生成和增長；逆溫層的強(qiáng)度對超細(xì)粒子的作用更為明顯。

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A lasting haze pollution event occurred in the central and East China in December, 2013. A field study on size distribution, number concentrations of aerosol particle with the diameter between 13.6-20 000 nm has been conducted by using Aerodynamic Particle Sizer (APS) and Scanning Mobility Particle Sizer (SMPS) during the haze period in Nanjing. Besides, the main meteorological parameters and chemical composition of particles, were also collected simultaneously. Results indicated that the particles in haze day are mainly accumulation mode, and the increasing of the particles between 500-1 000 nm and 1 000-2 500 nm was the main reason of the low visibility in haze days. With the increasing of relative humidity, the number concentrations of particles, as a function of the diameter, gradually reduced for particles in 13.6-100 nm (ultrafine particle), but increased for particles above 100 nm. The number concentrations of particles between 500-1 000 nm and 1 000-2 500 nm in diameter were obviously influenced by relative humidity and the secondary transformation of the gaseous contaminants (SO₂,NO_X). During the haze days, the number concentrations of particles were mainly influenced by the emission from southeasterly and northeasterly wind, and negatively related with wind speed. The influence of temperature on the particle number concentrations was obviously in 13.6 nm and 100 nm in diameter. The boundary layer height negatively correlated with the ultrafine particle. The intensity of inversion layer particularly impacted on the ultrafine particle.

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花艷,潘良寶,湯莉莉,陳楊,魏建蘇.南京霾天顆粒物數(shù)濃度特征及其受氣象條件影響分析.氣象科學(xué),2017,37(3):385-393 HUA Yan, PAN Liangbao, TANG Lili, CHEN Yang, WEI Jiansu. Characteristics of the particulate number concentration and association with meteorological conditions during winter haze episode in Nanjing. Journal of the Meteorological Sciences,2017,37(3):385-393

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收稿日期:2016-01-28
最后修改日期:2016-03-21
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在線發(fā)布日期: 2017-08-08
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