成都某机场低能见度气候特征及气象要素对比

Comparison of Low Visibility Climatic Characteristics and Meteorological Elements at an Airport in Chengdu

根据成都某机场2018~2019年能见度以及气象要素的常规观测场资料,结合成都市AQI及污染物浓度数据,分析了低能见度事件的气候特征并分型;以2018年成都某机场空域一次低能见度天气过程为例,研究了各气象要素对机场低能见度变化的影响。结果表明:低能见度事件在冬季发生频率最高,日变化显著,主要集中在3:00~7:00之间。辐射冷却是成都某机场低能见度事件发生的主要机制。成都某机场能见度与相对湿度、温度、PM_(2.5)浓度及AQI呈负相关关系,与风速、地面气压成正相关关系,高湿和低风速对低能见度的形成起关键作用,且高水平的PM_(2.5)浓度及AQI的也是造成能见度降低的重要因素。

Based on the conventional observation data of visibility and meteorological elements at an airport in Chengdu from 2018 to 2019, combined with the AQI data and pollutant concentration data, the climatic characteristics of low visibility events were analyzed and classified. Taking a low visibility weather process of an airport in Chengdu in 2018 as an example, the influence of various meteorological factors on the low visibility variation of the airport was studied. The results showed that low visibility events occurred most frequently in winter. The diurnal variation was significant, mainly concentrated between 3:00-7:00. Radiation cooling is the main mechanism of low visibility events at the Airport. The visibility of an airport in Chengdu is negatively correlated with relative humidity, temperature, PM_(2.5)concentration and AQI, and positively correlated with wind speed and surface air pressure. High humidity and low wind speed play a key role in the formation of low visibility, and high levels of PM_(2.5)concentration and AQI are also important factors causing the reduction visibility.