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Chinese Journal of Space Science ›› 2019, Vol. 39 ›› Issue (1): 93-99.doi: 10.11728/cjss2019.01.093

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Sensitivity Study of Viewing Path and Spectral Resolution on Absorbing Aerosol Index

ZHANG Zhuo1,2,3,4,5, WANG Yongmei1,3,4,5,6, WANG Weihe7, WANG Houmao1,3,4,5   

  1. 1 National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    2 University of Chinese Academy of Sciences, Beijing 100049;
    3 Laboratory of Space Environment Exploration, Beijing 100190;
    4 Beijing Key Laboratory of Space Environment Exploration, Beijing 100190;
    5 Key Laboratory of Environmental Space Situation Awareness Technology, Chinese Academy of Sciences, Beijing 100190;
    6 School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049;
    7 National Satellite Meteorological Center, China Meteorology Administration, Beijing 100081
  • Received:2017-12-06 Revised:2018-05-08 Online:2019-01-15 Published:2019-01-30

Abstract:

Absorbing Aerosol Index (AAI) has a broad application in pollution monitoring. AAI is influenced by many factors in atmosphere, such as altitude of boundary layer, height of cloud, relative humidity, as well as factors from instrumental properties and geometric observation view angles. The atmospheric radiance transfer model MODTRAN was used to simulate the effects of the streams used in the DISORT multiple scattering calculation in radiance transfer equation and view angle of instrument on the biases of AAI derivation. The results indicate that 8 Streams is the best choice in radiative transfer simulation of aerosol scattering, both in accuracy and computational efficiency. AAI varies similarly with the view angle for different aerosol thickness and types:When Relative Azimuth Angle <120°, the bias of AAI is largest when both the Solar Zenith Angle and Satellite Viewing Angle are between 40° and 60°; When Relative Azimuth Angle <180° and >120°, the bias of AAI is relatively small. Besides, spectral resolution has no significant influence on AAI retrieval results.

Key words: Absorbing Aerosol Index, View Angles, Spectral Resolution, MODTRAN model

CLC Number: