Quantitative Inversion Method And Application Of HJ-1A/B Satellite CCD Data In Atmospheric Environmental Monitoring

With the great progress of satellite remote sensing technology, the use of satellite remote sensing data of atmospheric suspended particulate matter and chemical pollutants monitoring has become one of the main means of atmospheric pollution monitoring at present. In twentieth Century eighty, seven’s, foreign scholars have begun to use remote sensing satellite technology to monitor the atmospheric suspended particulate matter and chemical pollutants.And has accumulated a lot of research methods and results. China’s independent research and development of satellite sensors, such as FY series, Ocean series, series of resource, environment of small satellite series, high series of satellite have mature application in the field of atmospheric environment, land and resources, marine resources, disaster prevention and mitigation,but in atmospheric monitoring such as suspended particulates, chemical pollutants, etc.the research is less.In the study of quantitative retrieval of atmospheric suspended particles by remote sensing, the method of fitting the model of aerosol optical thickness data and the concentration of suspended particulate matter(PM_2.5, PM10) by satellite data is more mature and the inversion effect better, and it can meet the requirement of monitoring in the suspended particulate matter change information of spatiotemporal distribution. In the monitoring of atmospheric chemical pollution,the data obtained from O3 detector is widely used abroad,and by combining the meteorological parameters, land use and other parameters, and use the differential optical absorption spectroscopy, the spectral band difference residual method etc. to estimate the fitting model, the spatial distribution characteristics of atmospheric chemical pollutants（such as SO₂, NO2, etc） are obtained. At present, it is able to monitor the global distribution of the SO₂ and NO2, such as the NO2,SO₂ high concentration evolution process of the volcanic eruption, the factory discharge, and the trace gases in the atmosphere（SO₂, NO2, CH4, CO2, etc.）.Based on the characteristics of air quality pollution in Beijing, this article studies the method of quantitative inversion of suspended particulate matter and chemical pollution gas in the atmospheric environment of Beijing city by using CCD data, and provides a feasible technical method for the practical application of domestic satellite in atmospheric environmental monitoring.This paper selects 288 sets concentration data of PM_2.5,SO₂ in Beijing City 2015, which obtained from ground monitoring station of Beijing（12 monitoring sites）,and builds the best fit model with AOD respectively. The correlation coefficient R2 of AOD-PM_2.5 model close to 0.8,and it can meet accuracy requirements of monitoring.On this basis, using AOD data to retrieve the spatial distribution information of PM_2.5 concentration in Beijing City, and realized the technology of the quantitative inversion of atmospheric suspended particulate matter by using HJ-1A/B satellite CCD data, which lays the foundation for the monitoring of atmospheric suspended particulate matter.But the correlation coefficient R2 is 0.1232 of AOD-SO₂ model lowly, the fitting effect is not ideal and do not meet the requirements of subsequent SO₂ concentration inversion. Based on the test results, the domestic satellite should be increased atmospheric chemistry pollutant monitoring special detecting channels, to provide the foundation for quantitative remote sensing inversion of atmospheric chemical pollutants, so as to realize the monitoring of chemical pollution.