Study on the Physical Characteristics of Burst Reinforcement during the Winter Fog of Nanjing

Abstract

Based on the data of three dense fog processes on 12,14 and 24~27 December,2006 occurred in the suburb of Nanjing,their development processes of fog and the characteristics of burst reinforcement are analyzed,and some reasons about burst reinforcement of fog are discussed.The result showed that the physical characteristics of burst reinforcement during the winter fog of Nanjing were as follows: Visibility fell sharply with short time(in 30 minutes),fog droplet number concentration,water content and droplet size increased markedly,and fog droplet spectrum became broader.Some causes were revealed that sharp drop of temperature because of radiant reinforcement of long wave or cold advection of nether layer,increase of humidity because of water vaporization of surface after sunrise or enhancement of southwest humid advection with turbulent mixing can make fog reinforce eruptively.