利用多源数据对2019年2月贵阳机场准静止锋低云天气诊断分析  

Diagnosis and Analysis of Quasi-stationary Front Low Cloud Weather at Guiyang Airport in February 2019 Based on Multi-source Data

作　　者：罗浩 张亚男 LUO Hao;ZHANG Yanan(Guizhou Air Traffic Control Sub Bureau of CAAC,Guiyang 550012,China)

机构地区：[1]中国民用航空西南地区空中交通管理局贵州分局,贵阳550012

出　　处：《高原山地气象研究》2023年第2期44-51,共8页Plateau and Mountain Meteorology Research

基　　金：中国民用航空西南地区空中交通管理局贵州分局科技项目(民航贵州空发〔2023〕9 号)。

摘　　要：利用多源数据对贵阳机场2019年2月发生的昆明准静止锋低云天气进行诊断分析。结果表明:当贵阳机场发生低云天气时,昆明准静止锋位于24°~27.5°N、104.5°~109°E;850 hPa及以下的偏南气流为准静止锋背景下贵阳机场低云天气的发生提供了主要水汽来源,越接近地面,水汽来源越趋向于西太平洋;贵阳机场低云天气发生时,准静止锋具有浅薄冷空气层的特点,冷空气层平均厚度为390m,最厚780m,最浅时仅有120m。低云天气发生时,贵州中部一线多有地面辐合线出现,可分为三类:当准静止锋位于贵州西部或云南东部时,需要重点关注偏北风与东南风之间的辐合;当准静止锋东退时,近地面偏南气流大范围进入贵州中南部区域,并与偏北气流在贵州中部一线形成辐合;当准静止锋处于锋生时,较强的冷空气南下与昆明热低压前沿的偏南气流在贵州中部形成对峙,产生辐合线。Using multi-source data,Kunming quasi-stationary front low cloud weather occurring in Guiyang Airport in February 2019 is diagnosed and analyzed.It shows that when the low cloud weather occurs in Guiyang Airport,the Kunming quasi-stationary front is located at 24°N~27.5°N and 104.5°E~109°E,the southerly airflow at 850 hPa and below provides the main source of water vapor for the occurrence of low cloud weather in Guiyang Airport under the background of quasi-stationary front.The closer to the ground,the more the water vapor source is coming from the western Pacific.The quasi-stationary front has the characteristics of shallow cold air layer when the low cloud weather occurs in Guiyang Airport.The average thickness of the cold air layer is 390 meters,the maximum thickness is 780 meters, the shallowest was only 120 meters. Ground convergence line appears more often in central Guizhou when the quasi-staionary front low cloud weather occurs in Guiyang Airport, it can be divided into three types: When the quasi-stationary front is located in western Guizhou or eastern Yunnan, the convergence line between northerly winds and southeast winds should be pay more attention;When the quasi-stationary front retreats eastward, the southward airflow near ground moves into the central and southern regions of Guizhou, and form a convergence line with the northerly airflow;When the quasi-stationary front is at the frontogenesis step, a strong cold air encoun-ters southerly airflow in the front of Kunming thermal low pressure in central Guizhou, which generates a convergence line.

关 键 词：昆明准静止锋 低云低能见度 锋生函数 温度平流 水汽通量散度 地面辐合线 

分 类 号：P441[天文地球—大气科学及气象学]