摘要
针对PM_(2.5)污染比较严重的川渝地区,本研究利用日本静止葵花卫星(Himawari-8)反演的气溶胶光学厚度(AOD)进行垂直订正和湿度订正估算川渝地区2017年—2018年09:00—16:00时的PM_(2.5)浓度。首先,基于气象观测的能见度(vis)数据与消光系数σa(λ)之间的关系,引入“标高(Ha)”对气溶胶光学厚度进行垂直订正;其次,根据匹配的气象和环境监测数据对每一个站点逐一拟合1—12月份的吸湿增长因子,并采用反距离加权空间插值(IDW)方法构建吸湿订正因子网格,从而进行湿度订正估算。研究结果表明,经垂直订正和湿度订正后,相比AOD与PM_(2.5)之间的相关性,“干”消光系数σ_(dry)与PM_(2.5)的相关性显著提高,相关系数(r)由0.12—0.45提高至0.32—0.69;验证09:00至16:00时卫星估算结果,相关系数(r)均大于0.7,均方根误差(RMSE)为18.59±2.26μg/m^(3);提取所有观测站点进行验证,r=0.82,RMSE=18.64μg/m^(3)。
Together with the sustained and rapid development of China’s economy in the past few years,the continuous improvement of the national economy,and the trend of urbanization,is the unceasing decline of China’s air quality.As a result,frequent occurrence of haze pollution weather has seriously affected people’s health.As the main pollutant of haze,PM_(2.5)has become a major concern of all people.Studies have shown that people exposed to PM_(2.5)for a long time are likely to suffer from respiratory and cardiovascular diseases,and even die prematurely.Therefore,it is of particular importance to monitor and evaluate PM_(2.5)effectively and accurately.According to the requirements of national development,Sichuan Province and Chongqing City(hereinafter referred to as Sichuan and Chongqing Area)will work together to build a two-city economic circle in Chengdu-Chongqing Area.Therefore,it is urgent to study and evaluate the regional atmospheric environmental air quality.However,due to the unique topography and meteorological conditions in Sichuan and Chongqing,estimating the near-surface PM_(2.5)concentration by using satellite remote sensing method is difficult.Considering the complicated topography in Sichuan and Chongqing Area,“Elevation(Ha)”was introduced for vertical correction of regional Aerosol Optical Depth.Moreover,considering the large difference of humidity and pollutant emission in different months,the hygroscopic correction factor grid was constructed for humidity correction by fitting the hygroscopic growth factor month by month and site by site.Therefore,first,the retrieval accuracy of AOD of Japanese geostationary Himawari satellite(Himawari-8)was verified in this study.Second,the vertical correction and humidity correction methods were used to estimate the hourly near-surface PM_(2.5)concentration from 09:00 to 16:00 in 2017—2018 in the Sichuan-Chongqing Area,and the accuracy was verified.The area PM_(2.5)concentration is helpful for the detailed analysis of pollutant generation,migration and d
作者
赵青琳
曾巧林
罗彬
许丽萍
范萌
陈良富
罗小波
ZHAO Qinglin;ZENG Qiaolin;LUO Bin;XU Liping;FAN Meng;CHEN Liangfu;LUO Xiaobo(College of Computer Science and Technology,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Meteorological Science Research Institute,Chongqing 401147,China;Sichuan Environmental Policy Research and Planning Institute,Chengdu 610041,China;Chongqing Ecological Environment Monitoring Center,Chongqing 401147,China;Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China)
出处
《遥感学报》
EI
CSCD
北大核心
2022年第10期1946-1962,共17页
NATIONAL REMOTE SENSING BULLETIN
基金
国家自然科学基金(编号:42001315,41830109)
国家重点研发计划(编号:2017YFB0503901,2018YFC0214003)。
