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利用常规观测资料和NCEP再分析资料从地面气象要素特征、地面辐射冷却、垂直运动特征及稳定度等方面分析2012年11月18日南昌昌北机场大雾的发生发展。结果表明:机场及其附近雾区的地面净辐射为负值,使得其主要作用表现为辐射冷却,这有利于近地面气温下降,从而有利于大雾的生成;低层相对湿度大,湿度露点差小与中层相对较干的配置构成此次雾发生的水汽条件;低层辐散、下沉运动使得低层暧湿空气在近地面层积聚冷却形成雾滴;低层逆温的存在和大气层结稳定构成了稳定条件,而逆温层破坏是大雾消散的主要原因。
Based on the conventional observation data and NCEP reanalysis data, the occurrence and development of heavy fog in Nanchang Changbei Airport on November 18, 2012 were analyzed from the characteristics of ground meteorological elements, ground radiative cooling, vertical movement characteristics and stability. The results show that the net radiation of the ground in the fog zone near the airport and its vicinity is negative, making its main function as radiation cooling, which is conducive to the temperature drop near the ground, which is conducive to the formation of heavy fog; low relative humidity, humidity dew point difference The relatively dry arrangement of small and middle layers constitutes the water and vapor conditions of the fog. The low-level divergent and sinking motion causes the low-level warm and humid air to accumulate and coalesce on the near-surface layer to form droplets. The existence of low-level inversion and the stable atmosphere make up Stable conditions, and the inversion layer destruction is the main reason dissipated fog.