Impact of Shrubs on Winter 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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Language: | English |
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Online Access: | https://hal.science/hal-03070596 https://hal.science/hal-03070596/document https://hal.science/hal-03070596/file/126-BelkeJC2020.pdf https://hal.science/hal-03070596/file/128-BelkeJHM2020.pdf https://doi.org/10.1175/jcli-d-19-0318.1 |
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ftccsdartic:oai:HAL:hal-03070596v1 2023-06-11T04:03:10+02:00 Impact of Shrubs on Winter 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) 2020-01-15 https://hal.science/hal-03070596 https://hal.science/hal-03070596/document https://hal.science/hal-03070596/file/126-BelkeJC2020.pdf https://hal.science/hal-03070596/file/128-BelkeJHM2020.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-03070596 https://hal.science/hal-03070596 https://hal.science/hal-03070596/document https://hal.science/hal-03070596/file/126-BelkeJC2020.pdf https://hal.science/hal-03070596/file/128-BelkeJHM2020.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-03070596 Journal of Climate, 2020, 33, pp.597 - 609. ⟨10.1175/jcli-d-19-0318.1⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.1175/jcli-d-19-0318.1 2023-05-07T01:04:01Z 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 Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Umiujaq ENVELOPE(-76.549,-76.549,56.553,56.553) Journal of Climate 33 2 597 609 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Belke-Brea, M Domine, Florent Barrere, M Picard, G Arnaud, L Impact of Shrubs on Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
topic_facet |
[SDE]Environmental Sciences |
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) |
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 Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
title_short |
Impact of Shrubs on Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
title_full |
Impact of Shrubs on Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
title_fullStr |
Impact of Shrubs on Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
title_full_unstemmed |
Impact of Shrubs on Winter Surface Albedo and Snow Specific Surface Area at a Low Arctic Site: In Situ Measurements and Simulations |
title_sort |
impact of shrubs on winter 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-03070596 https://hal.science/hal-03070596/document https://hal.science/hal-03070596/file/126-BelkeJC2020.pdf https://hal.science/hal-03070596/file/128-BelkeJHM2020.pdf https://doi.org/10.1175/jcli-d-19-0318.1 |
long_lat |
ENVELOPE(-76.549,-76.549,56.553,56.553) |
geographic |
Arctic Umiujaq |
geographic_facet |
Arctic Umiujaq |
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-03070596 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-03070596 https://hal.science/hal-03070596 https://hal.science/hal-03070596/document https://hal.science/hal-03070596/file/126-BelkeJC2020.pdf https://hal.science/hal-03070596/file/128-BelkeJHM2020.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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1768377530838941696 |