ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 44 Issue 3 > 2018,44(3):408-415. DOI:10.7519/j.issn.1000-0526.2018.03.007 Prev Next
Characteristics and Forecasting Focus for River Fog in Jiangsu Section of Yangtze River
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Abstract:
Using the minutely data including visibility, relative humidity, temperature and wind speed of 36 automatic weather stations along the Yangtze River in Jiangsu Province during 2010-2013, the characteristics of river fogs are analyzed. The results show that river fog mainly occurs in June, November and January, formed from 19:00 BT to the next 07:00 BT, during which the fog is the thickest in 02:00-04:00 BT and gets to end from 06:00 BT to 12:00 BT, so the fog duration is 3-9 h. When fog occurs, relative humidity is 85% or higher, temperature is 5-19℃ in spring, 18-26℃ in summer, 7-23℃ in autumn and 0-11℃ in winter. As for the wind speed, it is below 5 m·s-1 in spring, summer, autumn, and about 6 m·s-1 in winter. Specifically, the fog tends to occur with the wind direction of NNE-E and wind speed 1-2 m·s-1 in spring, the wind direction of NNE-ESE and wind speed 0.3-1 m·s-1 in summer, the wind direction of NNE-NE and E-ESE, wind speed 0.3-2 m·s-1 in autumn, and the wind direction of NNE-NE and WNW, wind speed 1-2 m·s-1 in winter. In addition, by analyzing the visibility changes of the first station in the fog, we found that there are obvious “trunklike” characteristics before river fogs develop. Such features could provide the basis for the operation of early warning and forecasting of river fogs.
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P456,457
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