Preprints
https://doi.org/10.5194/tc-2022-106
https://doi.org/10.5194/tc-2022-106
 
20 Jun 2022
20 Jun 2022
Status: this preprint is currently under review for the journal TC.

Validation of a fully-coupled radiative transfer model for sea ice with albedo and transmittance measurements

Zhonghai Jin1, Matteo Ottaviani1,2, and Monika Sikand3 Zhonghai Jin et al.
  • 1NASA Goddard Institute for Space Studies, New York, NY, USA
  • 2Terra Research Inc, Hoboken, NJ, USA
  • 3Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, USA

Abstract. A rigorous treatment of the sea ice medium has been incorporated in the advanced Coupled Ocean-Atmosphere Radiative Transfer (COART) model. The inherent optical properties (IOPs) of brine pockets and air bubbles over the 0.25–4.0 µm spectral region are parameterized as a function of the vertical profile of the sea ice physical properties (temperature, salinity and density). We test the model performance using available albedo and transmittance measurements collected during the Impacts of Climate on the Ecosystems and Chemistry of the Arctic Pacific Environment (ICESCAPE) and the Surface Heat Budget of the Arctic Ocean (SHEBA) field campaigns. The observations are adequately simulated when at least three layers are used to represent bare (first-year and multi-year) ice, including a thin top layer characterized by low density and high scattering. Two layers can be sufficient to model isolated cases of multi-year ice, and apply well to ponded ice except for shallow ponds over thick ice. The albedo and transmittance of ponded ice in the visible are mainly determined by the optical properties of the ice underlying the water layer used to model the pond. Sensitivity results indicate that the air volume or ice density has the largest impact on the simulated fluxes. Possible contamination from light-absorbing impurities, such as black carbon or ice algae, is also implemented in the model and is able to effectively reduce the albedo and transmittance in the visible spectrum to further improve the model-observation agreement. The agreement between the observed and modeled spectra validates the parameterization of the sea ice IOPs, and endorses COART as an accurate tool for radiation studies in the cryosphere.

Zhonghai Jin et al.

Status: open (until 13 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on tc-2022-106', Anonymous Referee #1, 22 Jul 2022 reply
    • AC1: 'Reply on RC1', Matteo Ottaviani, 09 Aug 2022 reply

Zhonghai Jin et al.

Zhonghai Jin et al.

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Short summary
A rigorous treatment of the sea ice medium has been incorporated in an advanced radiative transfer model. The inherent optical properties of brine pockets and air bubbles are parameterized as a function of the vertical profile of the sea ice physical properties (temperature, salinity and density). We test the model performance using available albedo and transmittance measurements collected during the ICESCAPE and the SHEBA field campaigns.