Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations
International audience Erect shrubs in the Arctic reduce surface albedo when branches protrude above the snow and modify snow properties, in particular specific surface area (SSA). Important consequences are changes in the land surfaceatmosphere energy exchange and the increase of snow melting in au...
Published in: | Journal of Climate |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2020
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Online Access: | https://hal.science/hal-02393209 https://hal.science/hal-02393209/document https://hal.science/hal-02393209/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Impact%20of%20Shrubs%20on%20Winter%20Surface%20Albedo%20and%20Snow%20Specific%20Surface%20Area%20at%20a%20Low%20Arctic%20Site%20In%20Situ%20Measurements%20and%20Simulations.pdf https://doi.org/10.1175/jcli-d-19-0318.1 |
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ftunivsavoie:oai:HAL:hal-02393209v1 |
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openpolar |
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Open Polar |
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Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
English |
topic |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes Belke-Brea, M. Domine, Florent Barrere, M. Picard, G. Arnaud, L. Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
topic_facet |
[SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Erect shrubs in the Arctic reduce surface albedo when branches protrude above the snow and modify snow properties, in particular specific surface area (SSA). Important consequences are changes in the land surfaceatmosphere energy exchange and the increase of snow melting in autumn, possibly inducing reduced soil thermal insulation and in turn permafrost cooling. Near Umiujaq (56.58N, 76.58W) in the Canadian low Arctic where dwarf birches (Betula glandulosa) are expanding, spectral albedo (400-1080 nm) under diffuse light and vertical profiles of SSA were measured in November and December 2015 at four sites: three with protruding branches and one with only snow. At the beginning of the snow season (8 November), shrub-induced albedo reductions were found to be wavelength dependent and as high as 55% at 500 nm and 18% at 1000 nm, which, integrated over the measurement range (400-1080 nm), corresponds to 70 W m 22 of additional absorbed energy. The impact of shrubs is not just snow darkening. They also affect snow SSA in multiple ways, by accumulating snow with high SSA during cold windy precipitation and favoring SSA decrease by inducing melting during warm spells. However, the impact on the radiation budget of direct darkening from shrubs likely dominates over the indirect change in SSA. Spectral albedo was simulated with a linear mixing equation (LME), which fitted well with observed spectra. The average root-mean-square error was 0.009. We conclude that LMEs are a suitable tool to parameterize mixed surface albedo in snow and climate models. |
author2 |
Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) |
format |
Article in Journal/Newspaper |
author |
Belke-Brea, M. Domine, Florent Barrere, M. Picard, G. Arnaud, L. |
author_facet |
Belke-Brea, M. Domine, Florent Barrere, M. Picard, G. Arnaud, L. |
author_sort |
Belke-Brea, M. |
title |
Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
title_short |
Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
title_full |
Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
title_fullStr |
Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
title_full_unstemmed |
Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
title_sort |
impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal.science/hal-02393209 https://hal.science/hal-02393209/document https://hal.science/hal-02393209/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Impact%20of%20Shrubs%20on%20Winter%20Surface%20Albedo%20and%20Snow%20Specific%20Surface%20Area%20at%20a%20Low%20Arctic%20Site%20In%20Situ%20Measurements%20and%20Simulations.pdf https://doi.org/10.1175/jcli-d-19-0318.1 |
genre |
albedo Arctic permafrost Umiujaq |
genre_facet |
albedo Arctic permafrost Umiujaq |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-02393209 Journal of Climate, 2020, 33, pp.597 - 609. ⟨10.1175/jcli-d-19-0318.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/jcli-d-19-0318.1 hal-02393209 https://hal.science/hal-02393209 https://hal.science/hal-02393209/document https://hal.science/hal-02393209/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Impact%20of%20Shrubs%20on%20Winter%20Surface%20Albedo%20and%20Snow%20Specific%20Surface%20Area%20at%20a%20Low%20Arctic%20Site%20In%20Situ%20Measurements%20and%20Simulations.pdf doi:10.1175/jcli-d-19-0318.1 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1175/jcli-d-19-0318.1 |
container_title |
Journal of Climate |
container_volume |
33 |
container_issue |
2 |
container_start_page |
597 |
op_container_end_page |
609 |
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1797572497079533568 |
spelling |
ftunivsavoie:oai:HAL:hal-02393209v1 2024-04-28T07:53:34+00:00 Impact of shrubs on surface albedo and snow specific surface area at a low arctic site: in-situ measurements and simulations Belke-Brea, M. Domine, Florent Barrere, M. Picard, G. Arnaud, L. Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Observatoire des Sciences de l'Univers de Grenoble (OSUG ) Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ) Université Grenoble Alpes (UGA) 2020 https://hal.science/hal-02393209 https://hal.science/hal-02393209/document https://hal.science/hal-02393209/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Impact%20of%20Shrubs%20on%20Winter%20Surface%20Albedo%20and%20Snow%20Specific%20Surface%20Area%20at%20a%20Low%20Arctic%20Site%20In%20Situ%20Measurements%20and%20Simulations.pdf https://doi.org/10.1175/jcli-d-19-0318.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/jcli-d-19-0318.1 hal-02393209 https://hal.science/hal-02393209 https://hal.science/hal-02393209/document https://hal.science/hal-02393209/file/%5B15200442%20-%20Journal%20of%20Climate%5D%20Impact%20of%20Shrubs%20on%20Winter%20Surface%20Albedo%20and%20Snow%20Specific%20Surface%20Area%20at%20a%20Low%20Arctic%20Site%20In%20Situ%20Measurements%20and%20Simulations.pdf doi:10.1175/jcli-d-19-0318.1 info:eu-repo/semantics/OpenAccess ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.science/hal-02393209 Journal of Climate, 2020, 33, pp.597 - 609. ⟨10.1175/jcli-d-19-0318.1⟩ [SDE]Environmental Sciences [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2020 ftunivsavoie https://doi.org/10.1175/jcli-d-19-0318.1 2024-04-11T00:42:33Z International audience Erect shrubs in the Arctic reduce surface albedo when branches protrude above the snow and modify snow properties, in particular specific surface area (SSA). Important consequences are changes in the land surfaceatmosphere energy exchange and the increase of snow melting in autumn, possibly inducing reduced soil thermal insulation and in turn permafrost cooling. Near Umiujaq (56.58N, 76.58W) in the Canadian low Arctic where dwarf birches (Betula glandulosa) are expanding, spectral albedo (400-1080 nm) under diffuse light and vertical profiles of SSA were measured in November and December 2015 at four sites: three with protruding branches and one with only snow. At the beginning of the snow season (8 November), shrub-induced albedo reductions were found to be wavelength dependent and as high as 55% at 500 nm and 18% at 1000 nm, which, integrated over the measurement range (400-1080 nm), corresponds to 70 W m 22 of additional absorbed energy. The impact of shrubs is not just snow darkening. They also affect snow SSA in multiple ways, by accumulating snow with high SSA during cold windy precipitation and favoring SSA decrease by inducing melting during warm spells. However, the impact on the radiation budget of direct darkening from shrubs likely dominates over the indirect change in SSA. Spectral albedo was simulated with a linear mixing equation (LME), which fitted well with observed spectra. The average root-mean-square error was 0.009. We conclude that LMEs are a suitable tool to parameterize mixed surface albedo in snow and climate models. Article in Journal/Newspaper albedo Arctic permafrost Umiujaq Université Savoie Mont Blanc: HAL Journal of Climate 33 2 597 609 |