Characteristics and Causes of the First Strong Dense Fog at Urumqi Airport in 2021
The thick fog weather at Urumqi Airport on November 16,2021 was observed and analyzed by using the multi-source observation data of ERA50.25°×0.25° reanalysis of the European Center,HTG-3 microwave radiometer,FY4A new generation stationary meteorological satellite,and Automatic Watch Over Runway System(AWOS).The results showed that the first thick fog at the airport in recent years usually occurred and maintained in the morning and afternoon of November,mainly as radiation fog,lasting 3-4 h.This thick fog showed a long duration,with both radiation and advection.After precipitation,the conditions with high humidity,night radiation and ground northwest wind increased to 4-5 m·s-1,were conducive to the formation of radiation fog at the airport and the advection of radiation fog upstream.There was a good correspondence between the ground convergence zone and the thick fog area.The north side of the convergence zone was northerly wind,and the south side was southerly wind.For thick fog monitoring,the comprehensive use of FY4A's 10.8 μm and 3.75 μm channel difference,0.83 μm,2.2 μm,3.75 μm can well display the fog area range,temperature,movement,fog dissipation and other characteristics,which was conducive to the identification,forecast and early warning of thick fog area.
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