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Remote Sens. 2015, 7(5), 6240-6256; doi:10.3390/rs70506240

Improving Remote Sensing of Aerosol Optical Depth over Land by Polarimetric Measurements at 1640 nm: Airborne Test in North China

1
State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing 100101, China
2
Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031 , China
3
Key Laboratory of Optical Calibration and Characterization, Chinese Academy of Sciences, Hefei 230031, China
4
University of Chinese Academy of Sciences, Beijing 100049, China
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad S. Thenkabail
Received: 18 February 2015 / Revised: 21 April 2015 / Accepted: 13 May 2015 / Published: 19 May 2015
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Abstract

An improved aerosol retrieval algorithm based on the Advanced Multi-angular Polarized Radiometer (AMPR) is presented to illustrate the utility of additional 1640-nm observations for measuring aerosol optical depth (AOD) over land using look-up table approaches. Spectral neutrality of the polarized surface reflectance over visible to short-wavelength infrared bands is verified, and the 1640-nm measurements corrected for atmospheric effects are used to estimate the polarized surface reflectance at shorter wavelengths. The AMPR measurements over the Beijing-Tianjin-Hebei region in north China reveal that the polarized surface reflectance of 670, 865 and 1640 nm are highly correlated with correlation slopes close to one (0.985 and 1.03) when the scattering angle is less than 145°. The 1640-nm measurements are then employed to estimate polarized surface reflectance at shorter wavelengths for each single viewing direction, which are then used to improve the retrieval of AOD over land. The comparison between AMPR retrievals and ground-based Sun-sky radiometer measurements during three experimental flights illustrates that this approach retrieves AOD at 865 nm with uncertainties ranging from 0.01 to 0.06, while AOD varies from 0.05 to 0.17. View Full-Text
Keywords: aerosol optical depth (AOD); polarized surface reflectance; 1640 nm; airborne Advanced Multi-angle Polarized Radiometer (AMPR) aerosol optical depth (AOD); polarized surface reflectance; 1640 nm; airborne Advanced Multi-angle Polarized Radiometer (AMPR)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Qie, L.; Li, Z.; Sun, X.; Sun, B.; Li, D.; Liu, Z.; Huang, W.; Wang, H.; Chen, X.; Hou, W.; Qiao, Y. Improving Remote Sensing of Aerosol Optical Depth over Land by Polarimetric Measurements at 1640 nm: Airborne Test in North China. Remote Sens. 2015, 7, 6240-6256.

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