ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 42 Issue 3 > 2016,42(3):372-381. DOI:10.7519/j.issn.1000-0526.2016.03.013 Prev Next
Analysis on the Characteristics of Meteorological Factors and Forecast Ideas for Regional Advection Fog in Jiangxi
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Abstract:
Based on the 2000-2012 conventional surface observations and sounding data in Jiangxi Province, this paper analyzed 54 regional advection fog weather events and meteorological factors by using the synthetic and statistical method, obtaining the statistical characteristics of the advection fog temperature inversion layer, temperature and humidity conditions, lowlevel wind field and the impact system. The results showed that: (1) The Jiangxi regional advection fog mainly occurs in February and March, seen more in the north than in the south. (2) The situation features are as follows: The lowlevel of Jiangnan Region has obvious warm and humidity advection, the shear line or convergence zone at 850 hPa is located in the region from Yangtze River to Jianghuai, the southwest wind speed at 925 hPa and 850 hPa is up to 3-8 m·s-1 and 7-15 m·s-1 respectively. Surface situation is mostly inverted trough and low pressure in the forepart of cold front, followed by the bottom of high pressure.（3） The relative humidity is ≥80% below 850 hPa, while it is ≤50% in the middle layer at 500 hPa. The surface air temperature and dew point range within 10-16℃, and the air is nearly saturated.（4） The advection fog mostly has single temperature inversion layer, whose inversion layer is higher and thicker than radiation fog. The intensity of temperature inversion is mainly between 1℃ and 3℃. Finally, the forecast focuses and forecast ideas of advection fog weather in Jiangxi (South China) are put forward.
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