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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/tc-2020-154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-2020-154
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Jul 2020

30 Jul 2020

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This preprint is currently under review for the journal TC.

Effect of small-scale snow surface roughness on snow albedo and reflectance

Terhikki Manninen1, Kati Anttila1, Emmihenna Jääskeläinen1, Aku Riihelä1, Jouni Peltoniemi2, Petri Räisänen1, Panu Lahtinen1, Niilo Siljamo1, Laura Thölix1, Outi Meinander1, Anna Kontu1, Hanne Suokanerva1, Roberta Pirazzini1, Juha Suomalainen2, Teemu Hakala2, Sanna Kaasalainen2, Harri Kaartinen2,3, Antero Kukko2,4, Olivier Hautecoeur5,a, and Jean-Louis Roujean6 Terhikki Manninen et al.
  • 1Finnish Meteorological Institute, Helsinki, P.O. Box 503, 00101, Finland
  • 2Finnish Geospatial Research Institute/National Land Survey, Geodeetinrinne 2, 02430 Masala, Finland
  • 3University of Turku, Department of Geography and Geology, 20500 Turku, Finland
  • 4Aalto University, Department of Built Environment, 02150 Espoo, Finland
  • 5Météo-France
  • 6Centre d’Etudes Spatiales de la BIOsphère (CESBIO) - UMR 5126 - 31401 Toulouse, France
  • acurrently at: Exostaff GmbH/EUMETSAT

Abstract. The primary goal of this paper is to present a model of snow surface albedo accounting for small-scale surface roughness effects. The model is based on photon recollision probability and it can be combined with existing bulk volume albedo models, such as TARTES. The model is fed with in situ measurements of surface roughness from plate profile and laser scanner data, and it is evaluated by comparing the computed albedos with observations. It provides closer results to empirical values than volume scattering based albedo simulations alone. The impact of surface roughness on albedo increases with the progress of the melting season and is larger for larger solar zenith angles. In absolute terms, surface roughness can decrease the total albedo by up to about 0.1. As regards the bidirectional reflectance factor (BRF), it is found that surface roughness increases backward scattering especially for large solar zenith angle values.

Terhikki Manninen et al.

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Terhikki Manninen et al.

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Short summary
The primary goal of this paper is to present a model of snow surface albedo (brightness) accounting for small-scale surface roughness effects. It can be combined with any volume scattering model. The results indicate that surface roughness may decrease the albedo by about 1–3 % in midwinter and even more than 10 % during late melting season. The effect is largest for low solar zenith angle values and lower bulk snow albedo values.
The primary goal of this paper is to present a model of snow surface albedo (brightness)...
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