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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-363
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Nov 2018

Research article | 06 Nov 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Novel aerosol extinction coefficients and lidar ratios over the ocean from CALIPSO-CloudSat: Evaluation and global statistics

David Painemal1,2, Marian Clayton1,2, Richard Ferrare2, Sharon Burton2, Damien Josset3, and Mark Vaughan2 David Painemal et al.
  • 1Science Systems and Applications Inc., Hampton, VA, 23666 USA
  • 2NASA Langley Research Center, Hampton, VA, 23666 USA
  • 3US Naval Research Laboratory Stennis Space Center, MS, 39529, USA

Abstract. Aerosol extinction coefficients (σa) and lidar ratios (LR) are retrieved over the ocean from CALIOP attenuated backscatter profiles by solving the lidar equation constrained with aerosol optical depths (AOD) derived by applying the Synergized Optical Depth of Aerosols (SODA) algorithm to ocean surface returns measured by CALIOP and CloudSat’s Cloud Profiling Radar. σa and LR are retrieved for two independent scenarios that require somewhat different assumptions: a) a single homogeneous atmospheric layer (1L) for which the LR is constant with height, and b) a vertically homogeneous layer with a constant LR overlying a marine boundary layer with a homogenous LR fixed at 25sr (2-layer method, 2L). These new retrievals differ from the standard CALIPSO version 4.1 (V4) product, as the CALIOP-SODA method does not rely on an aerosol classification scheme to select LR. CALIOP-SODA σa and LR are evaluated using airborne high spectral resolution lidar (HSRL) observations over the northwest Atlantic. CALIOP-SODA LR (1L and 2L) positively correlates with its HSRL counterpart (linear correlation coefficient r > 0.67), with a negative bias smaller than 13.2%, and a good agreement for σa (r ≥ 0.78) with a small negative bias (≤|−9.2%|). Furthermore, a global comparison of optical depths derived by CALIOP SODA and CALIPSO V4 reveals substantial differences over regions dominated by dust and smoke, in qualitative agreement with previously reported discrepancies between MODIS and CALIPSO AOD.

Global maps of CALIOP-SODA LR feature high values over littoral zones, consistent with expectations of continental aerosol transport offshore. In addition, seasonal transitions associated with biomass burning during June to October over the southeast Atlantic are well reproduced by CALIOP-SODA LR.

David Painemal et al.
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David Painemal et al.
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Latest update: 13 Nov 2018
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Short summary
One year of a new CALIOP-based aerosol extinction coefficient and lidar ratio dataset over the ocean is presented, with the goal of providing a flexible dataset for climate research as well as independent retrievals that can be helpful for refining CALIPSO Science Team algorithms. The retrievals are derived by constraining the lidar equation with aerosol optical depth estimated from cross-calibrated CALIOP and CloudSat surface echos.
One year of a new CALIOP-based aerosol extinction coefficient and lidar ratio dataset over the...
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