Effect of small-scale snow surface roughness on snow albedo and reflectance
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Published:2021-02-17
Issue:2
Volume:15
Page:793-820
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Manninen Terhikki, Anttila Kati, Jääskeläinen Emmihenna, Riihelä AkuORCID, Peltoniemi Jouni, Räisänen PetriORCID, Lahtinen Panu, Siljamo NiiloORCID, Thölix Laura, Meinander OutiORCID, Kontu AnnaORCID, Suokanerva Hanne, Pirazzini RobertaORCID, Suomalainen Juha, Hakala Teemu, Kaasalainen Sanna, Kaartinen HarriORCID, Kukko AnteroORCID, Hautecoeur Olivier, Roujean Jean-LouisORCID
Abstract
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 Two-streAm Radiative TransfEr in Snow (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, small-scale 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.
Funder
Academy of Finland
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Water Science and Technology
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