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• W3203670705 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The Snow, Ice, and Aerosol Radiative (SNICAR) model has been used in various capacities over the last 15 years to model the spectral albedo of snow with light-absorbing constituents (LACs). Recent studies have extended the model to include an adding-doubling two-stream solver and representations of non-spherical ice particles; carbon dioxide snow; snow algae; and new types of mineral dust, volcanic ash, and brown carbon. New options also exist for ice refractive indices and solar-zenith-angle-dependent surface spectral irradiances used to derive broadband albedo. The model spectral range was also extended deeper into the ultraviolet for studies of extraterrestrial and high-altitude cryospheric surfaces. Until now, however, these improvements and capabilities have not been merged into a unified code base. Here, we document the formulation and evaluation of the publicly available SNICAR-ADv3 source code, web-based model, and accompanying library of constituent optical properties. The use of non-spherical ice grains, which scatter less strongly into the forward direction, reduces the simulated albedo perturbations from LACs by <span class=inline-formula>∼9 <i>%</i></span>–<span class=inline-formula>31 <i>%</i></span>, depending on which of the three available non-spherical shapes are applied. The model compares very well against measurements of snow albedo from seven studies, though key properties affecting snow albedo are not fully constrained with measurements, including ice effective grain size of the top sub-millimeter of the snowpack, mixing state of LACs with respect to ice grains, and site-specific LAC optical properties. The new default ice refractive indices produce extremely high pure snow albedo (<span class=inline-formula>>0.99</span>) in the blue and ultraviolet part of the spectrum, with such values only measured in Antarctica so far. More work is needed particularly in the representation of snow algae, including experimental verification of how different pigment expressions and algal cell concentrations affect snow albedo. Representations and measurements of the influence of liquid water on spectral snow albedo are also needed." @default.
• W3203670705 created "2021-10-11" @default.
• W3203670705 creator A5065366159 @default.
• W3203670705 date "2021-09-28" @default.
• W3203670705 modified "2023-10-18" @default.
• W3203670705 title "Comment on gmd-2021-182" @default.
• W3203670705 doi "https://doi.org/10.5194/gmd-2021-182-rc2" @default.
• W3203670705 hasPublicationYear "2021" @default.
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