سابِق|تال

Relationship between absorbing aerosol index and total column ozone

  • role： First author第一作者
  • Affiliation：

    School of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China

  • Email：fuqiangchengdu@126.com
  • Introduction：赵富强(1987—　)，男，硕士研究生，研究方向为卫星遥感。E-mail：fuqiangchengdu@126.com
ZHAO Fuqiang1,  
  • role： Corresponding author通信作者
  • Affiliation：

    Key Lab. of Radiometric Calibration and Validation for Environment Satellites, China Meteorology Administration, National Satellite Meteorological Center, Beijing 100081, China

  • Email：wangwh@cma.gov.cn
  • Introduction：王维和(1966—　)，男，正研级高级工程师，研究方向为大气物理、大气环境以及痕量气体。E-mail：wangwh@cma.gov.cn
WANG Weihe2*,  
  • Affiliation：

    School of Electronic Engineering, Chengdu University of Information Technology, Chengdu 610225, China

DENG Xiaobo1,  
  • Affiliation：

    Integrated Circuit Design Center, Aerospace days Drawing Technology Co., Ltd. Sichuan branch, Chengdu 610101, China

YANG Yang3,  
  • Affiliation：

    Department of Electronic Information and Control Engineering, Yibin Vocational and Technical College, Yibin 644003, China

PENG Yongjie4

ملخص

The physical meaning of Absorbing Aerosol Index (AAI) is the spectral contrast at two ultraviolet (UV) wavelengths caused by absorbing aerosols; this contrast can be separated from other effects, including molecular Rayleigh scattering, surface reflection, gaseous absorption, and aerosol and cloud scattering. The AAI an indicate the presence of elevated absorbing aerosols; therefore, AAI based on space-borne backscattered UV instrument is a qualitative measure for atmospheric absorbing aerosols, such as desert and Black Carbon (BC) aerosols. The space-borne AAI data can be used for the study of spatial distribution and transport of absorbing aerosols, such as dust storm and environment pollution. Owing to the weak absorption of ozone in 331nm channel, such as the FY-3B Total Ozone Unit (TOU), a few relationships might exist between the AAI and the total column ozone. Thus, the AAI cannot completely separate the gaseous absorption effect from the aerosol absorption effect. The AAI is retrieved by comparing the measured backscattered UV radiances on top of the atmosphere and the UV radiances of pure molecular atmosphere, such as the Rayleigh scattering radiances, which is calculated by the radiative transfer model with the total column ozone as input. Hence, the retrieval of the AAI based on UV instruments might be affected by the uncertainty of ozone retrieval results. The radiative transfer model MODTRAN (MODerate resolution atmospheric TRANs mission) has been used to simulate the relationship between the AAI and the total column ozone, as well as the effect of ozone retrieval error on the retrieval of AAI. The simulation for the relation between the AAI and total column ozone is a sensitivity analysis process, in which the desert aerosol is adopted and the content of aerosol is fixed. The AAI is calculated by changing the total column ozone in the mid-latitude summer atmospheric model. The simulation results show that a 10% change of the total column ozone causes an approximately 15% change in the AAI. The effect of ozone uncertainty on the retrieval of the AAI is simulated through the calculation of the Rayleigh scattering radiance on top of the atmosphere by changing the total column ozone value in the mid-latitude summer atmosphere model. The results show that the AAI changes less than 1% with a 20% uncertainty in the total column ozone. The uncertainty of the total column ozone for FY-3/TOU is less than 5%, and the error of AAI caused by the ozone retrieval error is negligible. The AAI data of FY-3B/TOU for July of 2012 over the Taklimakan desert and Tibet Plateau are analyzed to verify the relationship between the AAI and the total column ozone, and the results show a remarkable correlation between the two. The conclusion cautions that using the AAI data of the spatial distribution of the total column must be considered in monitoring the absorbing aerosol process.

مفهوم

total column ozone;Absorbing Aerosol Index;MODTRAN;FY-3;TOU

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