Journal of Atmospheric and Environmental Optics ›› 2021, Vol. 16 ›› Issue (3): 256-268.

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Retrieval of Cloud Top Pressure in Oxygen A-band Based on Data From DPC Onboard GF-5 Satellite

QIAO Rui1;2, QIE Lili1∗, XU Hua1, LI Zhengqiang1;2∗, ZHU Sifeng1, XIE Yisong1, HONG Jin3, DAI Haishan4, MA Jinji5   

  1. 1 State Environmental Protection Key Laboratory of Satellite Remote Sensing, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 Key Laboratory of Optical Calibration and Characterization, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China; 4 Shanghai Institute of Satellite Engineering, Shanghai 201109, China; 5 School of Geography and Tourism, Anhui Normal University, Wuhu 241000, China
  • Received:2021-01-11 Revised:2021-02-22 Online:2021-05-28 Published:2021-05-28

Abstract: Cloud top pressure can be used to estimate cloud height, which is important for meteorological observation and cloud characteristics research. Based on 763 nm and 765 nm bands (in oxygen A-band) of the Directional Polarimetric Camera (DPC) onboard GF-5 satellite, a cloud top pressure retrieval method is studied. First, the calculation formula of atmospheric pressure is obtained by using radiative transfer simulation and polynomial fitting, and the fitting error of the formula is analyzed and corrected. Then, the influence of aerosol, atmosphere profile and other factors on the cloud top retrieval is analyzed, and the stability test and principle verification of the retrieval method are further carried out by using clear-sky surface. The stability test results show that the oxygen A-band retrieval method is stable and can be applied to different weather conditions and view angles, and the principle verification results show that the DPC retrieved pressure is in good correlation with the DEM estimated pressure, with the average deviation of surface pressure of 47.6 hPa. Finally, the retrieved DPC cloud top pressure is compared with the MODIS cloud top pressure product (MYD06), and it is shown that cloud top pressure observation results of the two satellites are in good agreement.

Key words: cloud top pressure, differential optical absorption spectroscopy, oxygen A-band, retrieval

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