2019年初春乌鲁木齐机场一次持续性浓雾天气分析

Analysis of a Continuous Fog at Urumqi Airport in Early Spring of 2019

摘要: 利用常规观测、跑道自观系统、FNL 1˚ × 1˚再分析、微波辐射计及FY4A卫星等资料，分析2019年3月18日发生在乌鲁木齐国际机场的一次大雾天气，发现：1) 此次大雾发生于高空槽前的西风带配合地面冷高压底部的环流背景下， 前期的降水造成低层明显增湿，配合稳定的层结，为大雾的形成和维持提供有利条件；2) 西北及偏北风有利于大雾维持，东南及偏南风则相反；3) 微波辐射计、卫星云图等探测资料对大雾生消预报具有一定的指导意义。

Abstract: Using conventional observation, Automated Weather Observing System, FNL 1˚ × 1˚ reanalysis, microwave radiometer and FY4A satellite data to analyze a continuous fog at Urumqi International Airport on March 18, 2019, it is found that: 1) The fog occurred under the circulation background of the westerly belt in front of the high altitude trough and at the bottom of the surface high pressures. The precipitation in the early stage resulted in the obvious humidification of the lower layer, and the stable stratification provided favorable conditions for the formation and maintenance for fog; 2) The northwest and northerly winds are favorable for fog maintenance, while the southeast and southerly winds are opposite; 3) The data of microwave radiometer and satellite cloud image have certain guiding significance for the forecast of fog.