2024年青岛一次近海平流雾的微物理特征观测分析

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AbstractAn advection fog event occurred along the coast of Qingdao from22 to 25 May 2O24.This study analyzes the microphysical characteristics of the sea fog using the data of FM-12O fog monitors at two coastal observing sites （Baguan Hilland Xiaomai Island），observations of surface automatic meteorological stations and ERA5 reanalysis data. The results are as follows.（1） The fog event is characterized by stable synoptic situation，southeast warm and moist airflow and a strong inversion layer.（2）During the event，the average number concentration at Baguan Hill （Xiaomai Island） is 277.02cm-3（77.58cm-3） with an average liquid water content of 0.051 g∙m-3（0.027g∙m-3） ，an average effective radius of 4.92μm （ 7.39μm ）and an average radius of 2.65μm （ 2.78μm ）.（3）The microphysical characteristics from these two observing sites exhibit synchronous temporal evolution，and the fog droplet spectrum displays a distinct bimodal structure during the development and maturation of the fog，particularly evident in the large particle range above 15μm .（4）The visibility parameterization scheme established based on both number concentration and liquid water content shows optimal predictive performance during the fog event.

Keywordssea fog；coast of Qingdao；observation；microphysical characteristics；fog droplet spectrum

0 引言

海雾是指发生在海上、岸滨和岛屿上空低层大气中，由于水汽凝结造成大气水平能见度（以下简称“能见度”）显著降低的天气现象[1]。（剩余13807字）