一次罕见的辐射-平流雾研究(Ⅱ)--雾水化学性质分析  

A study on a rare radiation-advection fog(Ⅱ)——the analysis of chemical characteristics of fog water

作　　者：封洋[1] 张国正[2] 朱彬[1] 濮梅娟[3] 刘端阳[1] 严文莲[1] 

机构地区：[1]南京信息工程大学应用气象学院,南京210044 [2]南京农业大学,南京210095 [3]江苏省气象局,南京210008

出　　处：《气象科学》2009年第1期17-24,共8页Journal of the Meteorological Sciences

基　　金：江苏省重大科技支撑与自主创新示范工程项目(BE2008618);中国气象局研究型业务专项(YW200601);国家自然基金项目(40775012)

摘　　要：利用2006年12月24—27日南京市持续浓雾的雾水样品资料,结合雾滴谱仪观测的雾的微物理结构和系留气球探测的边界层资料,分析了本次浓雾雾水的化学特征。结果表明:酸雾的频率达61.5%,平均pH值为5.63;雾水中主要阳离子是NH4+、Na+、Ca2+,主要阴离子是SO42-、NO3-,其次是Cl-;雾水中总离子和SO42-浓度水平较高,说明本次过程大气污染比较严重;雾水的Na+/Cl-为3.09,明显高于其它地区,Cl-亏损严重,主要是因为此次雾是辐射—平流雾,受到东南海面上吹来的暖湿平流的影响;雾水中的离子浓度远高于雨水中的浓度,但雨水比雾水更酸;雾水离子总浓度与雾滴粒径呈反相关趋势(r=-0.71);浓雾发展过程中,pH值先升后降,前后出现三次起伏,其趋势与各离子和总离子浓度的变化大体相反。In this paper, we use fog samples collected on December 24--27, 2006 in Nanjing and information with the fog droplet spectrometer observation of micro-physical structures and detection of balloon in the boundary layer information to analyze the chemical characteristics of the fog. The results show that： the frequency of acid fog is 61.5% ; the average pH is 5.63; the main cations in fog are NH4＋ , Na＋ , Ca2＋ ; the first main anion is SO4^2- , NO3- and the second is Cl- ; the concentration of total ion and SO4^2- is high, which shows that the air pollution in Nanjing is very serious. Na ＋/Cl- in fog water is 3.09, which is significantly higher than that in other regions. The Cl- loss is significant, because the fog is radiation-advection type affected by the winds of the southeast warm advcction. The ion concentration in fog water is much higher than that in the rain, but the fog is much more acid than rain. The ion concentration and fog droplet size is related to the anti-trend （ r = - 0. 71 ）. In the fog process, the pH first increased then dropped, this type of process took place three times and the trend with the ions and ion concentration in general is contrary.

关 键 词：辐射平流雾 雾水化学特性 化学分析 

分 类 号：P426.4[天文地球—大气科学及气象学]