气象科学2017，Vol.37Issue(3)：376-384,9.DOI:10.3969/2016jms.0020
长江中上游平原地区冬季雾观测分析
Analysis on winter fog over the upper and middle reaches of the Yangtze River
摘要
Abstract
The upper and middle reaches of the Yangtze River are one of the fog-prone areas in China,with 20-106 fog days each year.By using the data of boundary layer profiles and fog droplet spectra over Jianghan Plain in December,2012,the boundary structure and generation and disappearance process of fog case in winter of the area were studied emphatically.Results show that the fog in Jinzhou in winter usually appeared 1-2 days after a cold wave passage and most of them are advection-radiation fog.The development of the fog top was due to the accumulation of moisture under upper-layer inversion as well as substantial temperature decrease at 200-300 m;the sharp strengthening of ground fog was caused mainly because of lower saturation vapor pressure in the near-surface layer under the influence of cold advection and because of the inversion enhancement owing to upper-layer systematic sinking motion and combined by the moisture accumulation under inversion.During the fog-top declining,the fog layer evaporated via mixing with dry air outside,which was caused by a low-level jet.The mean number con centration was 150-406 (cm3),and its maximum value was up to 1983 (cm3).The mean liquid water content was 0.014-0.118 g/m3,with a maximum value of 0.786 g/m3,similar to the observation values in Nanjing and Chongqing but larger than those in many other regions.High aerosol concentration and sufficient supply of moisture led to extremely dense fog (visibility less than 50 m) in this region.关键词
平流辐射雾/长江中上游/低空急流Key words
Advection-radiation fog/The upper and middle reaches of the Yangtze River/Low-level jet分类
天文与地球科学引用本文复制引用
费冬冬,牛生杰..长江中上游平原地区冬季雾观测分析[J].气象科学,2017,37(3):376-384,9.基金项目
国家自然科学基金重点资助项目(41375138,41271515) （41375138,41271515）
江苏省普通高校研究生科研创新计划资助项目(CXLX13_488) （CXLX13_488）
