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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-137
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-137
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 19 Jun 2020

Submitted as: research article | 19 Jun 2020

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This preprint is currently under review for the journal AMT.

Empirically-Derived Parameterizations of the Direct Aerosol Radiative Effect based on ORACLES Aircraft Observations

Sabrina P. Cochrane1,2, K. Sebastian Schmidt1,2, Hong Chen1,2, Peter Pilewskie1,2, Scott Kittelman1, Jens Redemann3, Samuel LeBlanc4,5, Kristina Pistone4,5, Meloë Kacenelenbogen4, Michal Segal Rozenhaimer4,5,6, Yohei Shinozuka4,7, Connor Flynn8, Amie Dobracki9, Paquita Zuidema9, Steven Howell10, Steffen Freitag10, and Sarah Doherty11 Sabrina P. Cochrane et al.
  • 1Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, 80303, USA
  • 2University of Colorado, Laboratory for Atmospheric and Space Physics, Boulder, 80303, USA
  • 3School of Meteorology, University of Oklahoma, Norman, Oklahoma, 73019, USA
  • 4NASA Ames Research Center, Mountain View, 94035, USA
  • 5Bay Area Environmental Research Institute, Mountain View, 94035, USA
  • 6Department of Geophysics and Planetary Sciences, Porter School of the Environment and Earth Sciences, Tel-Aviv University, Tel-Aviv, Israel
  • 7Universities Space Research Association/NASAAmes Research Center, Mountain View, 94035, USA
  • 8Pacific Northwest National Laboratory, Richland, Washington, 99354, USA
  • 9Department of Atmospheric Science, Rosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, FL, 33146, USA
  • 10Department of Oceanography, University of Hawaii, Honolulu, HI, 96822, USA
  • 11Joint Institute for the Study of Atmosphere and Ocean, University of Washington, Seattle, WA, 98195, USA

Abstract. This work establishes an observationally-driven link from mid-visible aerosol optical depth (AOD) and other scene parameters to broadband shortwave irradiance (and by extension, the direct aerosol radiative effect, DARE), based on observations from the 2016 and 2017 field campaigns of ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS). Specifically, this is done by two parameterizations, one spanned by the mid-visible AOD and scene albedo below the aerosol layer, and another one with a third input, the mid-visible aerosol single scattering albedo (SSA). These parameterizations build on the earlier concept of radiative forcing efficiency, which describes the dependence of DARE on the AOD, and extend it to make the dependence on the other two scene parameters explicit.

The parameterizations are founded on 9 cases from the campaigns, for which we retrieve the spectral aerosol properties of SSA and asymmetry parameter (g) directly from the radiative fluxes, based on the method presented in Cochrane et al. (2019). These properties are used as the basis of the parameterizations, capturing the natural variability of the study region as sampled. The majority of the case-to-case variability within the ORACLES DARE dataset is attributable to the dependence on AOD and scene albedo. This is captured by the first parameterization, which is advantageous when satellite retrievals provide only limited information such as AOD and scene albedo. However, the second parameterization explains even more of the case-to-case variability by introducing the mid-visible SSA as third parameter. For both parameterizations, we provide the necessary coefficients, uncertainties, and code required for the user to reconstruct the parameterization for their use.

Sabrina P. Cochrane et al.

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Short summary
Based on observations from the 2016 and 2017 field campaigns of ORACLES (ObseRvations of Aerosols above CLouds and their intEractionS), this work establishes an observationally-driven link from mid-visible aerosol optical depth (AOD) and other scene parameters to broadband shortwave irradiance (and by extension, the direct aerosol radiative effect, DARE). The majority of the case-to-case DARE variability within the ORACLES dataset is attributable to the dependence on AOD and scene albedo.
Based on observations from the 2016 and 2017 field campaigns of ORACLES (ObseRvations of...
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