發(fā)布時間：2018-04-23 13:07

  本文選題：PM + 有機(jī)氣溶膠　； 參考：《環(huán)境科學(xué)學(xué)報》2017年11期

【摘要】：造成霧霾事件的主要原因是高濃度的大氣細(xì)顆粒物污染.為了深入研究大氣細(xì)顆粒物的消光來源,本研究采用高時間分辨率氣溶膠觀測儀器獲得了浙江金華秋季PM1主要化學(xué)組分濃度及干氣溶膠吸收系數(shù)和散射系數(shù)演變情況.結(jié)合有機(jī)氣溶膠正矩陣因子解析模型(PMF)和多元線性回歸方法,建立了擬合優(yōu)度很高(R2=0.977)的細(xì)顆粒物中主要化學(xué)組分與干氣溶膠消光系數(shù)間的定量關(guān)系模型.結(jié)果表明,觀測期間消光貢獻(xiàn)最大的是硫酸銨,貢獻(xiàn)率為35.1%;其次是硝酸銨,貢獻(xiàn)率為26.7%;二次有機(jī)氣溶膠(SOA)、生物質(zhì)燃燒有機(jī)氣溶膠(BBOA)、黑碳(BC)及氯化銨的消光貢獻(xiàn)率分別為14.3%、11.2%、8.7%、4.0%.在一些特定污染時段,BBOA具有最大的消光貢獻(xiàn),是導(dǎo)致此時大氣能見度大幅度衰減的首要因子.
[Abstract]:The main cause of haze event is high concentration of atmospheric fine particles pollution. In order to study the sources of extinction of atmospheric fine particles, the evolution of the concentration of main chemical components of PM1 and the absorption and scattering coefficients of dry aerosols in Jinhua, Zhejiang Province in autumn were obtained by using a high time resolution aerosol observation instrument. Combined with the analytical model of positive matrix factor of organic aerosol (PMF) and the multivariate linear regression method, a quantitative relationship model between the main chemical components of fine particulate matter and the extinction coefficient of dry aerosol was established. The results showed that the extinction contribution of ammonium sulfate was the greatest in the observed period, with a contribution rate of 35.1cm, followed by ammonium nitrate with a contribution rate of 26.7; the extinction contribution rate of the secondary organic aerosol, the biomass combustion organic aerosol BBOAA, the black carbon BCC) and the ammonium chloride were 14.311.28.70.The extinction contribution rates of the secondary organic aerosol were 14.311.28.7 and 4.0, respectively. BBOA has the greatest extinction contribution in some specific pollution periods and is the primary factor leading to the large attenuation of atmospheric visibility at this time.
【作者單位】： 北京大學(xué)深圳研究生院環(huán)境與能源學(xué)院城市人居環(huán)境科學(xué)與技術(shù)實驗室;浙江省環(huán)境監(jiān)測中心;
【基金】：國家自然科學(xué)基金(No.41622304) 深圳市科技計劃~~
【分類號】：X513
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本文編號：1792099