康博识,樊曙先,张悦. 2017. 南京冬季强浓雾天气中三级分档雾水与分粒径气溶胶的理化特性分析[J]. 气象学报, ():-, doi:10.11676/qxxb2017.022
南京冬季强浓雾天气中三级分档雾水与分粒径气溶胶的理化特性分析
KANG Boshi1,2,FAN Shuxian1,2,3*,ZHANG Yue4,LI Hao2,SUN Yu5
投稿时间:2016-10-09  最后修改时间:2016-12-21
DOI:10.11676/qxxb2017.022
中文关键词:  强浓雾天气,三级分档雾水,分粒径气溶胶,理化特性,南京
英文关键词:Deep dense fog ,Three-stage fog water, Particle-size aerosol,Physical and chemical properties,Nanjing
基金项目:国家自然科学基金项目(批准号: 41675132,41275151)资助
作者单位E-mail
康博识 南京信息工程大学大气物理学院 20141202145@nuist.edu.cn 
樊曙先 南京信息工程大学大气物理学院 shuxianf@ nuist.edu.cn 
张悦 重庆市气象局 20131202126@nuist.edu.cn 
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中文摘要:
      2013年12月7-9日南京出现持续性强浓雾天气过程。利用观测实验中获取的三级分档雾水和分粒径气溶胶的水溶性离子浓度,气溶胶数浓度谱、雾滴谱以及自动气象站获取的气象要素等资料,通过对比研究浓雾过程中4-16μm(三级)、16-22μm(二级)、>22μm(一级)3个粒径范围雾滴(雾水)与分粒径气溶胶的微物理特征和化学特性,探讨不同粒径气溶胶粒子吸湿增长对雾滴的贡献以及气溶胶离子组分对不同尺度雾滴化学性质的影响。结果表明,在强浓雾天气中,能见度为50m左右,短波辐射减弱形成稳定逆温层,有助于污染气溶胶的累积并吸湿增长向雾滴转化。雾滴的增加主要集中在小滴范围,尺度在0.5-1μm的气溶胶粒子对其贡献最大。各粒径段气溶胶中阴离子NO3-和SO42-均表现出较高值,阳离子中Ca2 浓度最高。三档雾水中各阴、阳离子浓度均在4-16μm小滴雾水中最高,16-22μm中滴雾水和>22μm大滴雾水的阴、阳离子浓度没有明显的高低之分。阳离子中Ca2 的浓度在第一级小滴雾水中最高,二级和三级雾水中NH4 的浓度最高,阴离子中NO3-和SO42-在各级雾水中浓度相差不多。雾水pH值2.7-6.9,呈酸性,小雾滴酸性更强。
英文摘要:
      In the time period of December 7-9, 2013, two deep dense fog events occurred in Nanjing. By using the observational data acquired from a field experiment conducted during this time period, we were able to investigate the contributions from different suspended aerosols with various sizes to the formation of fog droplets as well as the impacts of the ions in condensation nucleus on the chemical properties of the fog water. The observational data adopted in the present study consists of the concentrations of the water-soluble ions in three-stage fog droplets and also the particle-size aerosols, number distributions of the aerosol particles, distributions of the fog drop, meteorological factors and so on. The micro-physicochemical properties of the three-stages fog water (4-16μm for stage 3, 16-22μm for stage 2, larger than 22μm for stage 1) as well as the particle-size aerosols are compared and discussed. The result demonstrates that under the condition of the deep dense fog (visibility≈50m), due to the weakening of the radiation, a stable temperature inversion layer tends to form. As a result, the contaminated aerosols would accumulate and transit to fog droplets. Moreover, it is found that the aerosols in 0.5-1μm contribute the most to the increase of the number of the fog droplets in stage-3. There are higher concentration of NO3- and SO42- in the particle-size aerosols and Ca2 is the highest for the cations.In addition, among the fog droplets in these three stages, both of the anions and cations possess the highest concentrations in the droplets in stage-3. In contrast to that, the difference of the anion and cation concentrations between stage-1 and stage-2 is negligible. The results also show that the anion and cation in drop-size fog water mostly originate from the suspended aerosols and the chemical reactions. We also find that the concentration of Ca2 is the highest among all the cations in stage 1and NH4 is the highest in both stage 2 and stage 3..For the anions, NO3- and SO42- have the highest concentration with little difference. At last, it is observed that the fog is acidic (pH=2.7-6.9), and the fog drops with smaller size have relatively stronger acidity.
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