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Characteristics of the Macro- and Micro-structures of the Different
Grades Fog in Jiangsu Province
WANG Hongbin 1,2,3 ,ZHANG Zhiwei ,LIU Duanyang 1,2,3 ,ZU Fan 1,2,3 ,ZHU Yuying 1,2,3 ,WU Hong 1,2,3
1,3
(1. Key Laboratory of Transportation Meteorology of China Meteorological Administration,Nanjing 210041,Jiangsu,China;
2. Nanjing Joint Institute for Atmospheric Sciences,Nanjing 210041,Jiangsu,China;
3. Jiangsu Institute of Meteorological Sciences,Nanjing 210041,Jiangsu,China)
Abstract:Based on the minute-resolution meteorological elements data observed at 70 automatic weather sta‐
tions in Jiangsu,the second-resolution sounding data of 3 sounding stations and the fog droplet spectrum data of
21 dense fog events,from January 1,2013 to December 31,2018,the spatial and temporal distribution,bound‐
ary layer structure and microphysical structure characteristics of the fog at different grades in Jiangsu were ana‐
lyzed. The results show that in recent years,the number of fog hours in Jiangsu are distributed along the Yangtze
River and to the north along the Huaihe River. The average annual fogging time at each station is 318. 5 h,the
strong dense fog and extremely dense fog were mainly concentrated along the Huaihe River and its north,ac‐
counting for 16. 4% of the total fog hours. The probability of occurrence of fog in Jiangsu is the highest at 05:50,
and the probability of occurrence of fog in winter,spring,summer,and autumn is the highest at 07:10(Beijing
Time,after the same),05: 50,05: 20 and 05: 50,respectively. The temperature structure of fog at different
grades between 0 m and 1500 m has inversion layer,and with the increase of fog intensity,the inversion intensi‐
ty increases. And the relative humidity is saturated in the lower layer,but with the increase of fog intensity,the
relative humidity of upper layer decreases. With the increase of fog intensity,the number of fog drops of differ‐
ent sizes all increase,and the spectrum of fog drops expands obviously when strong dense fog or extremely
dense fog occurs.
Key words:Different grades fog;second sounding;boundary layer characteristics;fog droplet spectrum