摘要
本文利用地面气象站观测资料、青岛近海浮标站及自动气象站资料、卫星云图等数据,结合数值试验的结果,从观测分析、天气形势与边界层结构等方面,对2008年4月6—7日一次黄海西部离岸气流背景下形成岸滨雾过程的物理机制进行了分析与讨论。分析表明:(1)此次岸滨雾是来自陆地的暖湿空气被输送到冷海面凝结产生的。海雾生成前,偏南暖湿空气输送以及降水天气的条件,使离岸气流具有暖湿气流的性质。(2)在1 000hPa局地低压系统作用下,近地面风向转为离岸的偏北风,同时混合层厚度自陆地向海面降低,混合层内部气流离岸下沉至冷海面边界层内,水汽更容易在海面聚集饱和成雾,导致雾区随着离岸气流向南方海面上发展。数值试验进一步证明了离岸暖湿气流对岸滨雾生成过程的作用。该研究可为近海海雾预报提供重要参考。
In this paper,the meteorological observation data,Qingdao offshore buoy stations and automatic weather station data,satellite cloud image were conbined with the results of numerical simulation and numerical experiments were used to analysis and discuss the mechanism of the formation of coastal fog under the underground of the offshore airflow in western the Yellow Sea during 6 to 7 April 2008,from the observational analysis,the weather situation and the boundary layer structure,etc.The analysis shows that:(1)The coastal fog was generated by condensation of warm and humid air from the land to the cold sea surface.Before the generation of the sea fog,the condition of the south warm and humid air transport and precipitation weather made the offshore airflow possess the nature of the warm and humid air.(2)Under the action of the ground local low pressure system,the near ground wind turn to the north wind of the offshore.At the same time,the thickness of the mixing layer decreased from the land to the sea,the airflow in the mixing layer fell offshore to the boundary layer of the cold sea,water vapor was more likely to gather in the sea to saturated fogging,it leading to the development of fog along the offshore airflow to the southern sea.Numerical experiments further proved the effect of offshore warm and humid airflow on the coastal fog generation process.This research can provide an important reference for offshore sea fog prediction.
作者
黄山
张苏平
衣立
HUANG Shan;ZHANG Su-Ping;YI Li(Key Laboratory of Physical Oceanography Ocean-Atmosphere Interaction and Climate Laboratory,Ocean University of China,Qingdao 266100,China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第6期20-29,共10页
Periodical of Ocean University of China
基金
国家自然科学基金项目(41576108
41605006)
山东省自然科学基金项目(ZR2016DB26)
国家自然科学基金委员会-山东省人民政府联合资助海洋科学研究中心项目(U1606402)资助~~
关键词
岸滨雾
离岸气流
暖湿空气
混合层厚度
下沉运动
coastal fog
offshore airflow
warm and humid air
mixing layer thickness
subsidence movement
