A1 Refereed original research article in a scientific journal

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




AuthorsManninen Terhikki, Anttila Kati, Jääskeläinen Emmihenna, Riihelä Aku, Peltoniemi Jouni, Räisänen Petri, Lahtinen Panu, Siljamo Niilo, Thölix Laura, Meinander Outi, Kontu Anna, Suokanerva Hanne, Pirazzini Roberta, Suomalainen Juha, Hakala Teemu, Kaasalainen Sanna, Kaartinen Harri, Kukko Antero, Hautecoeur Olivier, Roujean Jean-Louis

PublisherCOPERNICUS GESELLSCHAFT MBH

Publication year2021

JournalCryosphere

Journal name in sourceCRYOSPHERE

Journal acronymCRYOSPHERE

Volume15

Issue2

First page 793

Last page820

Number of pages28

ISSN1994-0416

eISSN1994-0424

DOIhttps://doi.org/10.5194/tc-15-793-2021

Web address https://tc.copernicus.org/articles/15/793/2021/

Self-archived copy’s web addresshttps://research.utu.fi/converis/portal/detail/Publication/53693386


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 Trans-fEr 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.

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