Visibility inversion of a haze process in Beijing by remote sensing based on MODIS satellite observations
BAO Yunxuan;SHAO Yi;LI Xun;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD),Nanjing University of Information Science & Technology;Key Laboratory of Transportation Meteorology,China Meteorological Administration;Meteorological Administrative of Beijing City;
Haze has become one of the major weather disasters to harm social security and human health in the recent years and it reduces visibility and air quality for it contains a large number of pollutants and affects seriously the natural environment,human production and life. Satellite remote sensing data can make up for the shortage of manual field monitoring,which making full use of timeliness,reliability,wide range of satellite remote-sensing to monitor dynamically the distribution of a wide range of haze.In this paper,MODIS_L1 B data( MOD02_1 KM-Collections 6) was used to inverse the air aerosol optical thickness( AOD) and the road visibility of a great haze weather event occurred in Beijing from March,6 th to March,11 th in 2012 combined with the retrieved data of AOD from AERONET( Aerosol Robotic Network) of NASA in USA,the observed data of visibility from the Ground Meteorological Observation Stations Network in Beijing and the observed data of visibility from the Road Automatic Weather Monitoring Stations Network and the relationship between the AOD and the visibility in this event was analyzed. Finally,the reasonable control measures were tried to put forward combined with the local traffic situation against haze. It can be provide reference for haze weather monitoring and early warning and traffic safety operation in the future( Inversion Comparison process time matches the satellite transit time from 10: 00-12: 00).The results showed as follows:( 1) Both of the retrieved AOD values from MODIS remote sensing and the ground observed values of AOD from AERONET had a change tendency of a single peak type. But the AOD inversion values were higher than the observed values for the deviation of observed times.( 2) The visibility values calculated by the retrieved AOD values was basically consistent with the observed values,both the temporal and spatial variation trends were basically consistent and the correlation coefficient between the two was large than0. 6( P0. 01). All of these inversions and calculation was consistent with the actual occurrence characteristics of this haze event,the errors between the inversion values and actual values of the visibility was small( 0. 5 km) in the urban area and the inversion effect was better,but this error was large( 1 km) in the suburban area and the inversion effect was poor.( 3) Based on the distribution of expressway,and combined with different degrees of haze in different regions of Beijing,it can be seen that the haze pollution in the southeastern part of Beijing is the most serious. The sections of the expressway in the area are respectively: Beijing-Harbin Expressway( G1),Beijing-Shanghai high-speed( G2),Beijing-Taiwan high-speed( G3) and Beijing-Hong Kong and Macao highspeed( G4). In addition,it also included the Fifth Ring Road in Beijing.
【Fund】： 公益性行业(气象)科研专项(GYHY201406029; GYHY201306043);; 国家“十二五”科技支撑计划项目(2014BAG01B01);; 江苏省科技支撑计划(No.BE2015732);; 江苏省气象局北极阁基金资助项目(BJG201404)
【CateGory Index】： X513;P427.2
【CateGory Index】： X513;P427.2