COVID-19期间武汉地区GNSS水汽与雾霾相关性分析

Correlation analysis of GNSS water vapor and haze in Wuhan during COVID-19

在新型冠状病毒(COVID-19)流行期间,武汉地区停工停产,人类活动大大地减少了污染物的排放,分析武汉地区全球卫星导航系统(GNSS)水汽与雾霾的相关性。由于传统监测手段局限性大,而GNSS气象学具有时间分辨率高、实时性强、局限小的特点,因此,可借助GNSS水汽与雾霾数据,分析水汽与空气质量、雾霾的相关性。利用武汉站(WUHN)2020年1-4月的GNSS观测数据,对空气质量指数(AQI)与天顶对流层延迟(ZTD)、大气可降水量(PWV)与细颗粒物(PM2.5)之间的相关性进行了研究。实验结果表明:AQI、PM2.5的时间序列有着较好的一致性,其相关系数为0.81,说明二者强相关;武汉地区2020年1-4月,AQI与ZTD相关系数分别是0.14、0.05、0.12、0.11,二者之间无明显线性关系;2020年1-2月,AQI指数与PWV呈现正相关关系,4月份的AQI指数与PWV呈现出负相关关系;在雾霾事件发生过程中,PWV随PM2.5一起达到峰值;雾霾消散时,PM2.5浓度降低,PWV也随之减小,二者整体变化趋势一致,拟合效果较好。GNSS反演的水汽,可为雾霾天气监测研究提供参考。

In response to the suspension of work and production in Wuhan during the new Coronavirus Disease 2019(COVID-19)period,human activities have greatly reduced the emission of pollutants.Based on this analysis,Global Satellite Navigation System(GNSS)water vapor and haze space-time characteristics of the Wuhan area during COVID-19 are analyzed.Traditional monitoring methods have great limitations,while GNSS meteorology has the characteristics of high time resolution,strong real-time,and small limitations.Therefore,GNSS water vapor and haze data is used to analyze the correlation between water vapor and air quality and haze.Using Wuhan(WUHN)GNSS Center of Wuhan University observation data from January 2020 to April 2020,the correlation between Air Quality Index(AQI)and Zenith Tropospheric Delay(ZTD),Perceptible Water Vapor(PWV)and Particulate Matter(PM2.5)was studied.The experimental results show that:time series of AQI and PM2.5 have good consistency,with a correlation coefficient of 0.81(strength correlation);The correlation coefficients of AQI and ZTD in Wuhan from January 2020 to April 2020 are 0.14,0.05,0.12 and 0.11,respectively,without obvious linear relationship;AQI index and PWV show positive correlation from January 2020 to February 2020,and negative correlation between AQI index and PWV in AprilIn the process of haze events,PWV reaches the peak along with PM2.5;when haze dissipates,PM2.5 concentration decreases,and PWV also decreases.The overall change trend of the two is consistent,and the fitting effect is good.The water vapor retrieved by GNSS provides reference for haze weather monitoring and research.