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Nighttime aerosol optical depth retrievals from VIIRS day/night band data

  • role： First author第一作者
  • Affiliation：

    Key Laboratory of Photoelectric Imaging Technology and System of Ministry of Education , School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

  • Email：871331483@qq.com
  • Introduction：姜梦蝶，研究方向为偏振辐射定标、夜间气溶胶反演。E-mail： 871331483@qq.com
JIANG Mengdie1,  
  • role： Corresponding author通信作者
  • Affiliation：

    National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

  • Email：chenlin@cma.gov.cn
  • Introduction：陈林，研究方向为卫星资料辐射定标、遥感产品反演与应用。E-mail： chenlin@cma.gov.cn
CHEN Lin23*,  
  • Affiliation：

    Key Laboratory of Photoelectric Imaging Technology and System of Ministry of Education , School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

HE Yuqing1,  
  • Affiliation：

    National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

HU Xiuqing23,  
  • Affiliation：

    Key Laboratory of Photoelectric Imaging Technology and System of Ministry of Education , School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China

LIU Mingqi1,  
  • Affiliation：

    National Satellite Meteorological Center, China Meteorological Administration, Beijing 100081, China

    Key Laboratory of Radiometric Calibration and Validation for Environmental Satellites, China Meteorological Administration, Beijing 100081, China

ZHANG Peng23

реферат

Aerosol has an extensive impact on Earth’s climate and ecosystems and thus harmful to human health. The distribution of atmospheric aerosols has diurnal variation, and nighttime aerosol concentrations are higher than those during the day. Therefore, the accurate monitoring of AOD at night is significant but challenging. The Visible/Infrared Imager/Radiometer Suite (VIIRS) of Suomi National Polar-orbiting Partnership has a Day Night Band (DNB), which can observe the city light overnight. The artificial night light observed by the DNB of VIIRS reflects the extinction effect of the atmosphere and it is helpful in obtaining the nighttime AOD.To monitor the nighttime AOD, this study obtained the nighttime AOD on the basis of the theory of atmospheric radiation transmission. First, moonless and cloudless DNB data were selected, and the artificial lights during the crescent period were obtained by multi-day DNB data fusion. Second, the nighttime AOD was retrieved based on the extinction effect of aerosol on artificial lights. Finally, the obtained AOD is compared with the AOD from the CE318 and AQI indices from the environmental quality monitoring station to verify the feasibility of the retrieval method.This study focused on the nighttime AOD in North China from March 2016 to February 2017. The artificial lights of North China from four seasons were obtained, indicating that the major cities, especially the JingJinJi urban agglomeration, are very prominent in the artificial lights distribution map, and the traffic network between cities is clearly visible. Meanwhile, the nighttime AOD distribution during two heavily polluted weather processes in July and October 2016 was retrieved. The retrieval results indicate that the nighttime aerosols in North China are mainly distributed in the JingJinJi region and the provincial capital, which have developed industries and a dense population. Moreover, the retrieved and observed AODs are consistent, with an agreement index of up to 0.962, indicating that the retrieval study achieved good results.This study demonstrates the potential of satellite twilight data in monitoring the spatial distribution of urban pollution at night. The distribution characteristics of nighttime urban lights and aerosols are also provided, enriching the understanding of the temporal and spatial distribution of aerosols at night.

ключеви́че слова́

nighttime aerosol;Optical depth;NPP VIIRS DNB;city lights;remote sensing retrieval

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