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Algorithm research on the atmospheric infrared ultraspectral sounder tangent height adjustment aboard on GF-5 and inversion validation

  • role： First author第一作者
  • Affiliation：

    School of Electrical Engineering, Nantong University, Nantong 226019, China

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing Normal University, Beijing 100101, China

  • Email：wanghongmei@ntu.edu.cn
  • Introduction：王红梅，1986年生，女，讲师， 研究方向为大气遥感、掩星和临边反演大气成分机理。E-mail： wanghongmei@ntu.edu.cn
WANG Hongmei12,  
  • Affiliation：

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing Normal University, Beijing 100101, China

LI Xiaoying2,  
  • Affiliation：

    Beijing Institute of Space & Mechanical Electricity, Beijing 100094, China

ZHANG Yugui3,  
  • Affiliation：

    School of Electrical Engineering, Nantong University, Nantong 226019, China

BAI Guixiang1,  
  • role： Corresponding author通信作者
  • Affiliation：

    State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing Normal University, Beijing 100101, China

  • Email：chenlf@aircas.ac.cn
  • Introduction：陈良富，1965年生，男，研究员，研究方向为大气环境遥感。E-mail： chenlf@aircas.ac.cn
CHEN Liangfu2*

resumen

To obtain the temperature, pressure and trace gas profiles by infrared occultation sounding needs accurate pointing information. For the first-level spectral data of Atmospheric Infrared Ultraspectral Sounder aboard on satellite GF-5 (GF-5 AIUS), the spectral changes at different tangent heights at the full effective bands are analyzed in this paper. Then, a method for tangent height correction using look-up tables is used based on empirical statistics. Look-up tables are established using forward radiative transfer model, namely, Atmospheric Radiative Transfer Simulator (ARTS) with the atmospheric background profiles built using MLS and ACE-FTS Level 2 products for the last five years. The atmospheric transmittance background profiles represent the atmospheric state from 0 km to 120 km in the vertical direction with a grid width of 1 km. In the lower tangent height section (10—20 km), the N2 absorption band (2490—2520 cm-1) is selected to simulate the transmittance spectrum, and the low-level tangent height in the Level 1 data is corrected by a look-up table correction method. In the higher tangent height section (20—90 km), the transmittance spectrum is also simulated, and the O3 absorption band (1020—1150 cm-1) is used for correction. The correction algorithm adopts the method of global minimum root mean square error for statistical experiments and determines the minimum correction radius of 15 km. Finally, the inversion bands of the three atmospheric components of O3, HCl, and N2O are selected, and corrected transmittance data are compared with simulated transmittance, and verification of inversion product accuracy are performed. Results show that on the inversion channels of O3, HCl, and N2O, the corrected observed transmittance and simulated transmittance data are in good agreement, and the maximum observation deviation is less than 0.1, which shows that the tangent height correction algorithm can obtain a good effect. Meanwhile, based on Aura MLS and ACE-FTS Level 2 product, the cross-validation of O3, HCl, and N2O single profile is performed. The results show that the single profile value of O3 product is less than that of MLS product and higher than that of ACE-FTS product, with absolute deviation of less than 1 ppmv and relative deviation of less than 50% below 20 km and less than 20% above 20 km. The single profile value of HCl retrieved by GF5-AIUS is less than that of MLS and ACE-FTS products, with absolute deviation of less than 0.5 ppbv and relative deviation of less than 50% below 50 km. The single N2O profile value retrieved by GF5-AIUS is less than the ACE-FTS Level 2 product and higher than the MLS Level 2 below 25 km and above 40 km. In addition, the result is opposite in the range of 25—40 km; the absolute deviation between GF5-AIUS and ACE-FTS Level 2 products is less than 10 ppbv in the range of 30—60 km, and the relative deviation is approximately 200%. The absolute deviation is less than 25 ppbv, but the relative deviation is less than 25% below 30 km. Above 30 km, the content of N2O decreases, and the inversion error increases. Therefore, using N2 absorption channel and O3 absorption channel to establish look-up tables for GF-5 AIUS Level 1 data correction can satisfy the requirements of inversion. The disadvantage of this method is that the atmospheric background database requires regular updating to ensure a more accurate atmospheric transmittance look-up table.

palabra clave

infrared occultation detection;GF-5 AIUS;tangent height correction;N2 absorption channels;O3 absorption channels

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