%0 Journal Article
%T Analysis of the microphysical structure of heavy fog using a droplet spectrometer: A case study<br>Analysis of the Microphysical Structure of Heavy Fog Ｕsing a Droplet Spectrometer: A Case Study
%A NIU Shengjie
%A LU Chunsong
%A LIU Yangang
%A ZHAO Lijuan
%A LU Jingjing
%A YANG Jun
%A <br>NIU Shengjie
%A LU Chunsong
%A LIU Yangang
%A ZHAO Lijuan
%A LU Jingjing
%A YANG Jun
%J 大气科学进展
%D 2010
%I 
%X The microphysical properties of a long-lasting heavy fog event are examined based on the results from a comprehensive field campaign conducted during the winter of 2006 at Pancheng (32.2N, 118.7E), Jiangsu Province, China. It is demonstrated that the key microphysical properties (liquid water content, fog droplet concentration, mean radius and standard deviation) exhibited positive correlations with one another in general, and that the 5-min-average maximum value of fog liquid water content was sometimes greater than 0.5 g m-3. Further analysis shows that the unique combination of positive correlations likely arose from the simultaneous supply of moist air and fog condensation nuclei associated with the advection of warm air, which further led to high liquid water content. High values of liquid water content and droplet concentration conspired to cause low visibility (<50 m) for a prolonged period of about 40 h. Examination of the microphysical relationships conditioned by the corresponding autoconversion threshold functions shows that the collision-coalescence process was sometimes likely to occur, weakening the positive correlations induced by droplet activation and condensational growth. Statistical analysis shows that the observed droplet size distribution can be described well by the Gamma distribution.
%K fog microphysics
%K positive correlation
%K high liquid water content
%K low visibility
%K warm and moist air<br>大雾天气
%K 微物理结构
%K 液态水含量
%K Gamma分布
%K 谱仪
%K 雾滴
%K 平均半径
%K 物理特性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=28A2F569B2458C17&jid=5434AFBF6CB6E7E8D67733B541F211C7&aid=23EDD339A57F727FFA7234F2965ACF30&yid=140ECF96957D60B2&vid=DB817633AA4F79B9&iid=B31275AF3241DB2D&sid=BE411C407DAF4824&eid=207818BDA03879A7&journal_id=0256-1530&journal_name=大气科学进展&referenced_num=3&reference_num=53