辽宁一次连续大雾的天气要素特征分析

目的]探讨大雾的形成、持续及消散的原因。方法]在辽宁省的天气学资料和物理量的基础上,结合2009年11月29日～12月2日发生在辽宁11个地区持续4 d的大雾天气,从天气学形势、要素特征,尤其是大雾发生、维持、消散的天气学条件出发,对此次连续大雾过程进行了较为详细的分析。结果]此次大雾是由于辽宁处于鞍形气压场中,弱冷空气扩散使地面有多处较弱中尺度辐合区,前期气温较高造成积雪融化,伴随辐射降温和西南平流输送作用,出现了持续时间较长的大雾天气。同时,由于风速小和上空逆温层的存在,不利于潮湿空气的扩散;加之华北地区也出现大雾天气,高空西南气流将华北地区的潮湿空气输送到辽宁上空,更加重辽宁大雾的强度。结论]该研究为进一步做好空气污染气象预报提供依据。

Analysis of Weather Element Characteristics and Air Pollution Status during Continuous Fog Days in Liaoning

Objective] The aim was to discuss the formation,duration and disappearance of fog.Method] Based on the weather data and physics of Liaoning Province,and considering the continuous 4 day foggy days in 11 places in Liaoning from November 29,2009 to December 2,2009,detailed analysis of this consecutive foggy days was given proceeding from the weather situation,element characteristics,especially the occurrence,duration and disappearance of dense fog.Result] This dense fog was because that Liaoning was in the...