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Open AccessFeature PaperArticle
Remote Sens. 2016, 8(12), 1006;

Aerosol Retrievals from CALIPSO Lidar Ocean Surface Returns

Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA
Author to whom correspondence should be addressed.
Academic Editors: Raphael M. Kudela, Xiaofeng Li and Prasad S. Thenkabail
Received: 3 August 2016 / Revised: 24 November 2016 / Accepted: 28 November 2016 / Published: 9 December 2016
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This paper describes approaches to retrieve important aerosol results from the strong lidar return signals that are received by the space-borne CALIPSO lidar system after reflecting off-ocean surfaces. Relations, from which the theoretically expected values of area under ocean surface returns can be computed, are presented. A detailed description of the lidar system response to the ocean surface returns and the processes of sampling and averaging of lidar return signals are provided. An effective technique that reconstructs the lidar response to surface returns—starting from down-linked samples—and calculates the area under it, has been developed and described. The calculated area values are validated after comparing them to their theoretically predicted counterpart values. Methods to retrieve aerosol optical depths (AODs) from these calculated areas are described and retrieval results are presented, including retrieval comparison with independent AOD measurements made by an airborne High Spectral Resolution Lidar (HSRL) that yielded quite good agreement. Techniques and results are also presented on using the spectral ratios of the surface response areas to determine spectral ratios of aerosol round-trip transmission and AOD spectral difference, without need of a specific/accurate ocean-surface reflectance model. View Full-Text
Keywords: lidar; CALIPSO; ocean surface reflectance; aerosol transmittance; aerosol optical depth lidar; CALIPSO; ocean surface reflectance; aerosol transmittance; aerosol optical depth

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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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Venkata, S.L.; Reagan, J.A. Aerosol Retrievals from CALIPSO Lidar Ocean Surface Returns. Remote Sens. 2016, 8, 1006.

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