南京一次重霾天氣納米氣溶膠觀測(cè)研究

doi:10.12306/2019jms.0050

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南京一次重霾天氣納米氣溶膠觀測(cè)研究
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                        10.12306/2019jms.0050
                    
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中圖分類號(hào):P401
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃重點(diǎn)專項(xiàng)(2018YFC1507905);國(guó)家自然科學(xué)基金資助項(xiàng)目(41775134);江蘇省研究生科研創(chuàng)新計(jì)劃(SJKY19_0963)

An observational study of nano-scale aerosol during a heavy haze in Nanjing

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摘要:

為加深對(duì)南京地區(qū)重霾天氣過(guò)程納米尺度氣溶膠物理特征的了解,對(duì)2017年12月21—25日的一次重霾天氣過(guò)程進(jìn)行了綜合探測(cè),利用寬范圍粒徑譜儀觀測(cè)了此次過(guò)程中10~1 000 nm顆粒物數(shù)濃度,并結(jié)合能見(jiàn)度等氣象要素,對(duì)重霾期間納米氣溶膠譜分布進(jìn)行了分析。結(jié)果表明:此次霾重污染過(guò)程出現(xiàn)在低溫、高濕、氣壓上升期間;與非重污染時(shí)期相比,重污染期間N_10-20與N_20-100降低,N_100-1000升高;重污染期間氣溶膠粒子平均數(shù)濃度為17 035個(gè)/cm³,低于非重污染期間粒子數(shù)濃度,N_100-1000占總數(shù)濃度的55.05%;重霾發(fā)生期間納米氣溶膠數(shù)濃度譜為單峰結(jié)構(gòu),峰值在100 nm附近,隨著污染加重,納米氣溶膠峰值粒徑向大粒徑偏移,粒子向大粒徑段集中;不同溫度對(duì)不同粒徑粒子數(shù)濃度的影響不同,20~100 nm粒徑段氣溶膠與數(shù)濃度與溫度呈反相關(guān)性,100~500 nm粒子數(shù)濃度與溫度呈正相關(guān)性.

Abstract:

In order to deepen the understanding of physical characteristics of nano-scale aerosol in heavy haze weather process in Nanjing, a heavy haze process during 21-25 December 2017 was selected to detect comprehensively. Based on the aerosol number concentration data those particles are between 10-1000 nmfrom wide range of particle size spectrometer, and combined with meteorological elements, such as visibility, the nano-scale aerosol spectral distribution was analyzed. Results show that the heavy haze pollution occur during the period of low temperature, high humidity and rising air pressure. Compared with non-heavy pollution period, N_10-20 and N_20-100 decrease while N_100-1000 increases in heavy haze period. During heavy pollution, the average concentration of aerosol particles is 17035 in per cubic meter, lower than that during non-heavy pollution. N_100-1000 accounts for 55.05% of the total concentration during heavy pollution.During the occurrence of heavy haze, the nanometre aerosol number concentration spectrum has a single-peak structure, and the peak value is around 100 nm. With the increasing of pollution, the peak particle size of nanometre aerosol is shifted to large particle size, and the particles are concentrated in the large particle size segment.The influence of different temperature on particle number concentration of different particle size is different.The particle number concentration of 20-100 nm is inversely correlated with temperature, while the particle number concentration of 100-500 nm is positively correlated with temperature.

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孫瑋,牛生杰,王天舒,王元,李遙,張璐瑤.南京一次重霾天氣納米氣溶膠觀測(cè)研究.氣象科學(xué),2021,41(2):237-244 SUN Wei, NIU Shengjie, WANG Tianshu, WANG Yuan, LI Yao, ZHANG Luyao. An observational study of nano-scale aerosol during a heavy haze in Nanjing. Journal of the Meteorological Sciences,2021,41(2):237-244

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收稿日期:2019-08-13
最后修改日期:2019-10-12
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在線發(fā)布日期: 2021-05-14
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