亞青會(huì)期間南京地區(qū)大氣冰核的觀測(cè)分析

doi:10.3969/2015jms.0090

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亞青會(huì)期間南京地區(qū)大氣冰核的觀測(cè)分析
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                        10.3969/2015jms.0090
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41030962）；江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程項(xiàng)目（PAPD）

Measurement analysis of atmospheric ice nuclei in Nanjing during the Asian Youth Games

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2013年8月2-26日亞青會(huì)期間對(duì)南京地區(qū)進(jìn)行了大氣冰核的觀測(cè)采樣，同時(shí)結(jié)合氣溶膠、氣象要素等觀測(cè)資料，研究了南京地區(qū)大氣冰核濃度的分布特征，探究在污染管控措施下大氣氣溶膠的變化是否對(duì)冰核濃度產(chǎn)生影響。結(jié)果表明，大氣氣溶膠濃度在污染管控的措施下明顯降低，冰核濃度在多種因素影響下沒(méi)有明顯降低的變化趨勢(shì)，但有明顯的日變化特征。燃放煙花的空氣污染時(shí)刻，大氣冰核濃度隨污染物濃度的增加會(huì)明顯增加。當(dāng)活化濕度達(dá)到水面過(guò)飽和，溫度范圍為-12~-23℃時(shí)，南京夏季的冰核濃度范圍為0.38~50.55 L^-1。將活化溫度和冰面過(guò)飽和度同時(shí)加入到參數(shù)化公式中得到大氣冰核濃度N（T，S_i）=0.003 1exp（-0.254 9T+0.161 6S_i）。進(jìn)一步分析冰核濃度與PM_2.5、PM₁₀、PM₁₀-PM_2.5的關(guān)系，發(fā)現(xiàn)冰核濃度與PM₁₀-PM_2.5的相關(guān)性較高，相關(guān)系數(shù)為0.55，說(shuō)明大粒徑氣溶膠粒子更容易充當(dāng)冰核，大粒徑氣溶膠在冷云過(guò)程中起著更為重要的作用。

Abstract:

During the Asian Youth Games from August 2 to 26, 2013, the atmospheric ice nuclei in Nanjing was measured and sampled. Moreover, combined with the aerosols and meteorological elements observation data, the distribution characteristics of ice nuclei concentration and the influence of aerosols variation on ice nuclei concentration were further analyzed under the pollution controls. Results show that the atmospheric aerosol concentration significantly decreased under the measurements of pollution control, and the ice nuclei concentration did not decrease under the influence of a variety of factors, but had obvious diurnal variation. Ice nuclei concentration will significantly increase as the increasing of various pollutants' concentration. The observed ice nuclei concentration was 0.38 L^-1 to 50.55 L^-1 at the activation temperature from -12℃ to -23℃ and the saturation with respect to water is 100%. Based on measurements, a parametric equation N(T,S_i)=0.003 1exp (-0.254 9 T+0.161 6S_i)was developed to represent the variations of IN concentration with temperature and supersaturation. The aerosols in the size range of 1-10 μm acting as ice nuclei were more than that in other size ranges. The further analysis on the relationship between ice nuclei concentration and PM_2.5, PM₁₀, PM₁₀-PM_2.5 found that the correlation of ice nuclei concentration and PM₁₀-PM_2.5 was more obvious and the correlation coefficient was 0.55, which indicated that aerosol particles in the larger size range are more likely to act as ice nuclei and then have more important effects on the formation process of cold clouds.

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高任杰,銀燕,蔣惠,袁亮,李琦.亞青會(huì)期間南京地區(qū)大氣冰核的觀測(cè)分析.氣象科學(xué),2017,37(2):141-150 GAO Renjie, YIN Yan, JIANG Hui, YUAN Liang, LI Qi. Measurement analysis of atmospheric ice nuclei in Nanjing during the Asian Youth Games. Journal of the Meteorological Sciences,2017,37(2):141-150

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收稿日期:2015-08-16
最后修改日期:2015-11-04
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在線發(fā)布日期: 2017-05-16
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