Trend analysis of the aerosol optical depth from fusion of MISR and MODIS retrievals over China

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Guo, Jing^1,2 ; Gu, Xingfa^1,2 ; Yu, Tao^1,2 ; Cheng, Tianhai^1,2 ; Chen, Hao^1,2

Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China^1

Demonstration Center for Spaceborne Remote Sensing, Chinese National Space Administration, Beijing, China^2

关键词: Aerosol optical depths;    Aerosol properties;    Aerosol remote sensing;    Cloud contamination;    Moderate resolution imaging spectroradiometer;    Multiangle imaging spectroradiometer;    Spatial and temporal distribution;    Yangtze river delta;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012036/pdf
DOI  :  10.1088/1755-1315/17/1/012036

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Atmospheric aerosol plays an important role in the climate change though direct and indirect processes. In order to evaluate the effects of aerosols on climate, it is necessary to have a research on their spatial and temporal distributions. Satellite aerosol remote sensing is a developing technology that may provide good temporal sampling and superior spatial coverage to study aerosols. The Moderate Resolution Imaging Spectroradiometer (MODIS) and Multi-angle Imaging Spectroradiometer (MISR) have provided aerosol observations since 2000, with large coverage and high accuracy. However, due to the complex surface, cloud contamination, and aerosol models used in the retrieving process, the uncertainties still exist in current satellite aerosol products. There are several observed differences in comparing the MISR and MODIS AOD data with the AERONET AOD. Combing multiple sensors could reduce uncertainties and improve observational accuracy. The validation results reveal that a better agreement between fusion AOD and AERONET AOD. The results confirm that the fusion AOD values are more accurate than single sensor. We have researched the trend analysis of the aerosol properties over China based on nine-year (2002-2010) fusion data. Compared with trend analysis in Jingjintang and Yangtze River Delta, the accuracy has increased by 5% and 3%, respectively. It is obvious that the increasing trend of the AOD occurred in Yangtze River Delta, where human activities may be the main source of the increasing AOD.