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Retrieval of Aerosol Optical Depth Based on HJ-1 Satellite

Author: ZengLingJian
Tutor: ZuoQiLong；GaoQingXian
School: Nanjing University of Information Engineering
Course: Applied Meteorology
Keywords: HJ-1 satellite AOD Atmospheric pollution Air Pollution Index
CLC: X513
Type: Master's thesis
Year: 2011
Downloads: 195
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Abstract


In recent years, the climate effects of aerosols caused the world's attention. Charged with the task of environmental monitoring and mitigation of environmental One satellite, its application potential is still to be discovered. In this paper, HJ-1 satellite data inversion of the aerosol optical depth (AOD), and using MODIS aerosol photometer AOD products and ground measurements test the accuracy of the inversion results, and finally, the use of HJ-1 satellite and ground data analysis a typical pollution process, the establishment of API and AOD inversion results, the relationship between meteorological factors model. The following conclusions: 1) the use of 6S radiative transfer model to build multi-band aerosol lookup tables, using the NDVI discriminant dark dark pixel pixel inversion of HJ-1 satellite CCDAOD to reflect the spatial characteristics of aerosols. But in less vegetation season, or in cities with higher surface reflectance, the dark pixel inversion of AOD unsatisfactory results. 2) The 2009 March-June between HJ-1 satellite CCD AOD inversion results resampled compared with MODIS aerosol products, get 31 group comparative data, correlation coefficient was 0.791, the former mean AOD and the dispersion is slightly larger than the latter, the absolute error of about 0.06, the relative error of about 13.6%. The HJ-1AOD results resampled space and MODIS results comparing the two AOD distribution reflects a more consistent distribution of aerosols, the individual identification of dark pixels there are differences. AOD scatter comparing the results show the correlation coefficient of 0.7265, HJ-1AOD results and MODIS results are close. Meanwhile scatter comparison shows, the two red-band surface reflectance correlation coefficient of 0.7275, the former is slightly smaller than the latter reflectivity. 3) its time compared to ground CE318 observations, a correlation coefficient of 0.8517. CE318 observation period average of 0.71 AOD, HJ-1 and the average value of the inversion AOD 0.82, slightly higher than the former. HJ-1 AOD retrieval absolute error of about 0.09, the relative error of about 12.5%. 4) Select using API 17-19 March a typical dust pollution processes, utilization HJ-1AOD inversion results and ground data were analyzed. During the satellite - terrestrial AOD, and other meteorological changes correspond well, the continuity of surface observations and satellite observations of the formation of macroscopic effective complementary. 5) attempts to establish an API with HJ-1 inversion AOD, the relationship between meteorological factors model and its validation. The results showed that the model with quantitative remote sensing to the API reference, but from the practical application is still room for improvement.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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