Remote sensing of atmospheric PM2.5 from high spatial resolution image of Chinese environmental satellite HJ-1/ CCD data

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Zhengqiang, Li^1 ; Yuhuan, Zhang^1,2 ; Ying, Zhang^1,2 ; Weizhen, Hou^1 ; Yan, Ma^1 ; Cheng, Chen^1,2

State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, China^1

University of Chinese Academy of Sciences, Beijing 100049, China^2

关键词: Environmental satellites;    Ground based measurement;    High spatial resolution images;    Observation information;    Particle size information;    Planetary boundary layers;    Radiative transfer model;    Simultaneous determinations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012023/pdf
DOI  :  10.1088/1755-1315/17/1/012023

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Due to lack of the middle infrared wavelength, it is difficult to employ the classic dark target method to retrieve aerosol optical depth (AOD) from Chinese Environmental satellite HJ1-CCD data. Therefore, focusing on extracting weak information from mixed satellite signals of atmosphere and land surface, we developed the Multi-wavelength, Multi-sensor, Multi-day (3M) approach in order to utilize maximally the observation information, and with the consideration of a prior knowledge, e.g. the surface property changes quickly with location but slowly with time. We present the AOD retrieval algorithm based on HJ1-CCD blue and green bands, based on the look-up table approach constructed using 6S radiative transfer model to provide the simultaneous determination of AOD and the ground reflectance. The aerosol and particle size information obtained from ground-based sun-sky radiometer are then used to estimate PM2.5on the surface level, while air humidity and height of planetary boundary layer from reanalysis data are employed to improve the correlation between AOD and PM2.5Validation of the retrieval results with different spatial resolutions (300, 500 and 1000 m), are also performed by comparison with ground-based measurements at three sites of North China regions.