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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-60
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  04 Mar 2020

04 Mar 2020

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A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Evaluation of a Method for Converting SAGE Extinction Coefficients to Backscatter Coefficient for Intercomparison with LIDAR Observations

Travis N. Knepp1, Larry Thomason1, Marilee Roell1, Robert Damadeo1, Kevin Leavor2, Thierry Leblanc3, Fernando Chouza3, Sergey Khaykin4, Sophie Godin-Beekmann4, and David Flittner1 Travis N. Knepp et al.
  • 1NASA Langley Research Center, Hampton, Virginia 23681, USA
  • 2Science Systems and Applications, Inc. Hampton, Virginia 23666, USA
  • 3Jet Propulsion Laboratory, California Institute of Technology, Wrightwood, CA 92397
  • 4Laboratoirè Atmospheres, Milieux, Observations Spatiales, Université Pierre et Marie Curie, Centre National de LaRecherche Scientifique, France

Abstract. Aerosol backscatter coefficients were calculated using multi-wavelength aerosol extinction products from the SAGE II and SAGE III/ISS instruments. The conversion methodology is presented followed by an evaluation of the conversion algorithm's robustness. The SAGE-based backscatter products were compared to backscatter coefficients derived from ground-based lidar at three sites (Table Mountain Facility, Mauna Loa, and Observatoire de Haute-Provence). This evaluation includes the major eruption of Mt. Pinatubo in 1991 followed by the atmospherically quiescent period beginning in the late nineties. Recommendations are made regarding the use of this method for evaluation of aerosol extinction profiles collected using the occultation method.

Travis N. Knepp et al.

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Travis N. Knepp et al.

Travis N. Knepp et al.

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Latest update: 10 Aug 2020
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Short summary
Two common parameters that represent atmospheric aerosol loading are the backscatter and extinction coefficients. Measuring backscatter and extinction coefficients requires different viewing geometries and fundamentally different instrument systems. Further, these coefficients are not directly comparable. We present an algorithm to convert SAGE-observed extinction coefficients to backscatter coefficient for intercomparison with lidar backscatter products, followed by evaluation of the method.
Two common parameters that represent atmospheric aerosol loading are the backscatter and...
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