南京不同天气和能见度下云凝结核的观测分析

发布时间：2018-01-22 16:13

本文关键词： 云凝结核雾霾能见度气溶胶　出处：《气象科学》2016年06期 　论文类型：期刊论文

【摘要】：利用美国DMT公司生产的云凝结核(Cloud Condensation Nuclei,CCN)计数器(DMTCCNC),对2013年4—12月南京地区CCN进行观测。对不同天气条件下CCN活化谱拟合,霾天C值最高,为13 085 cm-3,雨后C值降至8 054 cm-3,属于大陆性核谱。不同能见度条件下CCN活化谱特征有明显差异,南京地区不同程度霾天CCN数浓度均远高于轻雾天,浓雾时期CCN数浓度显著偏高。CCN数浓度受到气象要素和天气状况、气溶胶源排放等因素影响。南京地区气溶胶凝结核(Condensation Nuclei,CN)数浓度和CCN数浓度的拟合结果显示出较好的相关性。CCN数浓度值:冬季春季秋季夏季,春季CCN数浓度日变化有三峰趋势,夏季基本呈单峰型,秋季、冬季双峰特征突出。气溶胶源排放、环境气象条件和气溶胶理化特性均会影响CCN数浓度的季节变化。
[Abstract]:The Cloud Condensation Nucleitic CCNC counter produced by DMT Company of the United States of America is used to make use of the DMTCCNC). The CCN of Nanjing area from April to December of 2013 was observed. According to the fitting of CCN activation spectrum under different weather conditions, the C value of haze days was the highest (13 085 cm-3). C value decreased to 8 054 cm ~ (-3) after rain, which belongs to continental nuclear spectrum. The characteristics of CCN activation spectrum are different under different visibility conditions. The concentration of CCN number in different degree haze days in Nanjing was much higher than that in light smog days. The concentration of CCN number was significantly higher during dense fog period. The concentration of CCN number was affected by meteorological factors and weather conditions. Aerosol source emission and other factors. Condensation Nuclei of aerosol condensation nucleus in Nanjing area. The fitting results of CNN number concentration and CCN number concentration showed a good correlation. CCN number concentration: winter, spring, autumn and summer, spring CCN number concentration diurnal variation trend of three peaks. In summer and autumn, the characteristics of double peaks are prominent. Aerosol source emission, environmental meteorological conditions and physical and chemical properties of aerosol all affect the seasonal variation of CCN number concentration.
【作者单位】：南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室;江苏省气象科学研究所;
【基金】：国家自然科学基金资助项目(41375137,41305135) 江苏省自然科学基金资助项目(BK2012860) 江苏省气象局北极阁开放研究基金(BJG201304) 气象灾害省部共建教育部重点实验室(南京信息工程大学)开放课题(KLME1205)
【分类号】：P426.31;X513
【正文快照】： tion in spring,a unimodal type in summer and an distinctive bimodal characteristic in autumn and winter.Seasonal changes of CCN number concentration is affected by aerosol source emission,environmental me-teorological condition,physical and chemical prop

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