大气科学2025，Vol.49Issue(2)：522-536,15.DOI:10.3878/j.issn.1006-9895.2210.22180
基于无人机的江苏沿海辐射雾边界层气象要素和污染物浓度特征研究
Characteristics of Meteorological Elements and Pollutant Concentration in the Boundary Layer of Radiation Fog on Jiangsu Coast Based on Unmanned Aerial Vehicles
摘要
Abstract
To further investigate the vertical distribution characteristics of meteorological elements and pollutant concentrations in the boundary layer during radiation fog,a comprehensive observation experiment was conducted in Donghai County,Jiangsu province using unmanned aerial vehicles(UAVs)in the winter of 2020.The findings revealed that the thickness of the inversion layer on foggy days is tens to hundreds of meters thicker than on sunny days,with a strength increase of 0.5-1℃(100 m)-1.On foggy days,wind shear occurs at low altitudes,while the wind shows minimal vertical variation.By contrast,on sunny days,wind speed remains relatively stable at low altitudes;however,the wind direction rotates clockwise with height.Radiation fog with a deep single-layer inversion structure exhibits greater intensity compared to fog with a double-layer inversion structure.During the same radiation fog event,fog intensity remains unaffected by changes in wind direction,while lower wind speeds are more conducive to the formation of dense fog.From the perspective of pollutant vertical distribution,total volatile organic compound(TVOC)concentrations at the same height within the inversion layer are higher on sunny days than on foggy days.Before and during the generation stage of radiation fog,the rate of SO2 concentration decreases with height and is significantly higher than that during the same period on sunny days.The vertical variations in O3 and NO2 on clear and foggy days are strongly negatively correlated,with the O3 gradient near the ground on foggy days being much steeper than on clear days.Concentrations of PM1.0,PM2.5,and PM10 are more than twice as high on foggy days compared to sunny days,while CO remains relatively stable with minimal vertical variation during radiation fog.TVOC,NO2,PM1.0,PM2.5,and PM10 are affected by the strong inversion layer during radiation fog,leading to their accumulation within the inversion layer.After the fog dissipates,the cumulative change rate of these pollutants decreases significantly compared to pre-fog conditions.The reduction in cumulative change rate is more pronounced for particulate pollutants than for gases,with larger particles showing a greater decrease than smaller ones.At night,NO and other reducing substances emitted from the ground struggle to move upward,resulting in much lower O3 consumption in the upper layer compared to the lower layer.Consequently,O3 concentrations in the upper layer are significantly higher than those in the lower layer at night.During the day,enhanced solar radiation and the development of an unstable boundary layer promote the downward mixing of O3 from the upper atmosphere,leading to an increase in O3 levels and PM2.5 emissions;this results in a more consistent vertical variation of O3 and PM2.5 during the daytime.关键词
辐射雾/边界层/气象要素/大气污染物/无人机/高分辨率垂直观测Key words
Radiation fog/Boundary layer/Meteorological elements/Atmospheric pollutant/Unmanned aerial vehicles(UAVs)/High resolution vertical observation分类
天文与地球科学引用本文复制引用
邬昊鹏,汪玲玲,鲁海宁,牛生杰,刘端阳,吕晶晶,祖繁,周悦,王元,葛攀延,邵乃夫..基于无人机的江苏沿海辐射雾边界层气象要素和污染物浓度特征研究[J].大气科学,2025,49(2):522-536,15.基金项目
国家自然科学基金项目(41775134、42075063、42075066、41875170),广西重点研发计划项目(桂科AB20159013) Funded by National Natural Science Foundation of China(Grants 41775134,42075063,42075066,41875170),Key Research and Development Program of Guangxi(Grant GuikeAB20159013) （41775134、42075063、42075066、41875170）
