摘要
利用Vaisala系留气球低空探测系统、自动气象站和雾滴谱光谱探测仪（FM100）等,对2006年12月24—27日南京市区及其周边地区出现的罕见浓雾过程进行了综合探测。结果表明,此次雾过程属于典型的平流雾,雾的发展及消亡过程主要受冷暖平流的影响。此次雾过程可分为生成、发展、维持和消亡阶段,期间的平均数密度为123.58-661.24个.cm^-3,平均直径为3.12-7.33μm,平均含水量为0.016-0.137 g.m^-3,最大直径为20.28-50.00μm。在生成发展阶段,雾滴谱逐渐上抬、拓宽,谱型由单峰逐步向双峰、三峰转化。单峰峰值直径为2μm,双峰2μm、16μm;三峰期间分别为2μm、16μm和23μm。在维持阶段,滴谱存在周期性振荡。雾滴谱的演变具有明显的日变化特征。
A comprehensive fog observation was carried out in Nanjing between 24 and 27 December,2006 to investigate development processes and microstructure of fogs,using the Vaisala DigiCORA Tethersonde system,automatic weather station,fog particle spectrometer（FM100） and other instruments.Results show that the development and dissipation of the relatively typical advection fog were dominated by warm and cool airflow,respectively.The averaged number concentration,diameter,liquid water content and maximum diameter in different stages of the fog process were in the ranges of 123.58—661.24 cm-3,3.12—7.33 μm,0.016—0.137 g·m-3,and 20.28—50.00 μm,respectively.During the formation and development stage,the droplet size distributions broadened gradually,mean while the spectrum pattern turned from the unimodal pattern peaked at 2 μm to the bimodal one peaked at 2 μm and 16 μm and the trimodal one peaked at 2 μm,16 μm and 23 μm,respectively.During the maintenance stage,fog droplet spectra varied in 2 h or 4 h periodic oscillation,and the evolution of spectra had an obvious characteristic of diurnal variation.In the initial period of dissipation stage,drizzlies appeared with the great variation of fog droplet spectrum pattern due to the weak cool airflow.The fog had a short-lived development after the sunrise,thereafter dissipated as the result of a intensive outburst of cool airflow.
出处
《南京气象学院学报》
CSCD
北大核心
2009年第2期269-276,共8页
Journal of Nanjing Institute of Meteorology
基金
江苏省教育厅高校自然科学重大基础研究项目(06KJA17021)
江苏省气象灾害重点实验室项目(KLME060208)
公益性行业(气象)科研专项(GYHY(QX)200706026)
关键词
雾滴谱
微物理结构
平流雾
fog droplet spectrum
micro-physical structure
advection fog
