Retrieval of 500 m aerosol optical depths ...
Document type :
Article dans une revue scientifique: Article original
DOI :
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Title :
Retrieval of 500 m aerosol optical depths from modis measurements over urban surfaces under heavy aerosol loading conditions in winter
Author(s) :
Jin, Shikuan [Auteur]
Wuhan University [China]
Ma, Yingying [Auteur]
Wuhan University [China]
Zhang, Ming [Auteur]
China University of Geosciences [Wuhan] [CUG]
Gong, Wei [Auteur]
Wuhan University [China]
Doubovik, Oleg [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Liu, Boming [Auteur]
Wuhan University [China]
Shi, Yifan [Auteur]
Wuhan University [China]
Yang, Changlan [Auteur]
Wuhan University [China]
Wuhan University [China]
Ma, Yingying [Auteur]
Wuhan University [China]
Zhang, Ming [Auteur]
China University of Geosciences [Wuhan] [CUG]
Gong, Wei [Auteur]
Wuhan University [China]
Doubovik, Oleg [Auteur]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Liu, Boming [Auteur]
Wuhan University [China]
Shi, Yifan [Auteur]
Wuhan University [China]
Yang, Changlan [Auteur]
Wuhan University [China]
Journal title :
Remote Sensing
Abbreviated title :
Remote Sens.
Volume number :
11
Publication date :
2019-10-01
ISSN :
2072-4292
English keyword(s) :
aerosol optical depth
urban surfaces
remote sensing
heavy aerosol loading
urban surfaces
remote sensing
heavy aerosol loading
HAL domain(s) :
Physique [physics]
English abstract : [en]
Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products are used worldwide for their reliable accuracy. However, the aerosol optical depth (AOD) usually retrieved by the operational dark target (DT) algorithm ...
Show more >Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products are used worldwide for their reliable accuracy. However, the aerosol optical depth (AOD) usually retrieved by the operational dark target (DT) algorithm of MODIS has been missing for most of the urban regions in Central China. This was due to a high surface reflectance and heavy aerosol loading, especially in winter, when a high cloud cover fraction and the frequent occurrence of haze events reduce the number of effective satellite observations. The retrieval of the AOD from limited satellite data is much needed and important for further aerosol investigations. In this paper, we propose an improved AOD retrieval method for 500 m MODIS data, which is based on an extended surface reflectance estimation scheme and dynamic aerosol models derived from ground-based sun-photometric observations. This improved method was applied to retrieve AOD during heavy aerosol loading and effectively complements the scarcity of AOD in correspondence with urban surface of a higher spatial resolution. The validation results showed that the retrieved AOD was consistent with MODIS DT AOD (R =~0.87; RMSE =~0.11) and ground measurements (R =~0.89; RMSE =~0.15) from both the Terra and the Aqua satellite. The method can be easily applied to different urban environments affected by air pollution and contributes to the research on aerosol.Show less >
Show more >Moderate Resolution Imaging Spectroradiometer (MODIS) aerosol products are used worldwide for their reliable accuracy. However, the aerosol optical depth (AOD) usually retrieved by the operational dark target (DT) algorithm of MODIS has been missing for most of the urban regions in Central China. This was due to a high surface reflectance and heavy aerosol loading, especially in winter, when a high cloud cover fraction and the frequent occurrence of haze events reduce the number of effective satellite observations. The retrieval of the AOD from limited satellite data is much needed and important for further aerosol investigations. In this paper, we propose an improved AOD retrieval method for 500 m MODIS data, which is based on an extended surface reflectance estimation scheme and dynamic aerosol models derived from ground-based sun-photometric observations. This improved method was applied to retrieve AOD during heavy aerosol loading and effectively complements the scarcity of AOD in correspondence with urban surface of a higher spatial resolution. The validation results showed that the retrieved AOD was consistent with MODIS DT AOD (R =~0.87; RMSE =~0.11) and ground measurements (R =~0.89; RMSE =~0.15) from both the Terra and the Aqua satellite. The method can be easily applied to different urban environments affected by air pollution and contributes to the research on aerosol.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
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Submission date :
2024-01-30T11:45:50Z
2024-02-22T12:31:20Z
2024-04-23T08:23:09Z
2024-02-22T12:31:20Z
2024-04-23T08:23:09Z
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