Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships
International audience A data set of radiometric measurements collected in the Beaufort Sea (Canadian Arctic) in August 2009 (Malina project) is analyzed in order to describe apparent optical properties (AOPs) in this sea, which has been subject to dramatic environmental changes for several decades....
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ftccsdartic:oai:HAL:hal-01532188v1 2023-05-15T14:55:34+02:00 Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships Antoine, David Hooker, S.B. Bélanger, S Matsuoka, A Babin, M Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) NASA Goddard Space Flight Center (GSFC) Université du Québec à Rimouski (UQAR) Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) 2013 https://hal.sorbonne-universite.fr/hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188/document https://hal.sorbonne-universite.fr/hal-01532188/file/bg-10-4493-2013.pdf https://doi.org/10.5194/bg-10-4493-2013 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-4493-2013 hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188/document https://hal.sorbonne-universite.fr/hal-01532188/file/bg-10-4493-2013.pdf doi:10.5194/bg-10-4493-2013 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01532188 Biogeosciences, European Geosciences Union, 2013, 10 (7), pp.4493-4509. ⟨10.5194/bg-10-4493-2013⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2013 ftccsdartic https://doi.org/10.5194/bg-10-4493-2013 2021-12-26T00:06:41Z International audience A data set of radiometric measurements collected in the Beaufort Sea (Canadian Arctic) in August 2009 (Malina project) is analyzed in order to describe apparent optical properties (AOPs) in this sea, which has been subject to dramatic environmental changes for several decades. The two properties derived from the measurements are the spectral diffuse attenuation coefficient for downward irradiance, Kd, and the spectral remote sensing reflectance, Rrs. The former controls light propagation in the upper water column. The latter determines how light is backscattered out of the water and becomes eventually observable from a satellite ocean color sensor. The data set includes offshore clear waters of the Beaufort Basin as well as highly turbid waters of the Mackenzie River plumes. In the clear waters, we show Kd values that are much larger in the ultraviolet and blue parts of the spectrum than what could be anticipated considering the chlorophyll concentration. A larger contribution of absorption by colored dissolved organic matter (CDOM) is responsible for these high Kd values, as compared to other oligotrophic areas. In turbid waters, attenuation reaches extremely high values, driven by high loads of particulate materials and also by a large CDOM content. In these two extreme types of waters, current satellite chlorophyll algorithms fail. This questions the role of ocean color remote sensing in the Arctic when Rrs from only the blue and green bands are used. Therefore, other parts of the spectrum (e.g., the red) should be explored if one aims at quantifying interannual changes in chlorophyll in the Arctic from space. The very peculiar AOPs in the Beaufort Sea also advocate for developing specific light propagation models when attempting to predict light availability for photosynthesis at depth. Article in Journal/Newspaper Arctic Beaufort Sea Mackenzie river Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Mackenzie River Biogeosciences 10 7 4493 4509 |
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 |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Antoine, David Hooker, S.B. Bélanger, S Matsuoka, A Babin, M Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience A data set of radiometric measurements collected in the Beaufort Sea (Canadian Arctic) in August 2009 (Malina project) is analyzed in order to describe apparent optical properties (AOPs) in this sea, which has been subject to dramatic environmental changes for several decades. The two properties derived from the measurements are the spectral diffuse attenuation coefficient for downward irradiance, Kd, and the spectral remote sensing reflectance, Rrs. The former controls light propagation in the upper water column. The latter determines how light is backscattered out of the water and becomes eventually observable from a satellite ocean color sensor. The data set includes offshore clear waters of the Beaufort Basin as well as highly turbid waters of the Mackenzie River plumes. In the clear waters, we show Kd values that are much larger in the ultraviolet and blue parts of the spectrum than what could be anticipated considering the chlorophyll concentration. A larger contribution of absorption by colored dissolved organic matter (CDOM) is responsible for these high Kd values, as compared to other oligotrophic areas. In turbid waters, attenuation reaches extremely high values, driven by high loads of particulate materials and also by a large CDOM content. In these two extreme types of waters, current satellite chlorophyll algorithms fail. This questions the role of ocean color remote sensing in the Arctic when Rrs from only the blue and green bands are used. Therefore, other parts of the spectrum (e.g., the red) should be explored if one aims at quantifying interannual changes in chlorophyll in the Arctic from space. The very peculiar AOPs in the Beaufort Sea also advocate for developing specific light propagation models when attempting to predict light availability for photosynthesis at depth. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) NASA Goddard Space Flight Center (GSFC) Université du Québec à Rimouski (UQAR) Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Antoine, David Hooker, S.B. Bélanger, S Matsuoka, A Babin, M |
author_facet |
Antoine, David Hooker, S.B. Bélanger, S Matsuoka, A Babin, M |
author_sort |
Antoine, David |
title |
Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
title_short |
Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
title_full |
Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
title_fullStr |
Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
title_full_unstemmed |
Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships |
title_sort |
apparent optical properties of the canadian beaufort sea – part 1: observational overview and water column relationships |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://hal.sorbonne-universite.fr/hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188/document https://hal.sorbonne-universite.fr/hal-01532188/file/bg-10-4493-2013.pdf https://doi.org/10.5194/bg-10-4493-2013 |
geographic |
Arctic Mackenzie River |
geographic_facet |
Arctic Mackenzie River |
genre |
Arctic Beaufort Sea Mackenzie river |
genre_facet |
Arctic Beaufort Sea Mackenzie river |
op_source |
ISSN: 1726-4170 EISSN: 1726-4189 Biogeosciences https://hal.sorbonne-universite.fr/hal-01532188 Biogeosciences, European Geosciences Union, 2013, 10 (7), pp.4493-4509. ⟨10.5194/bg-10-4493-2013⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-10-4493-2013 hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188 https://hal.sorbonne-universite.fr/hal-01532188/document https://hal.sorbonne-universite.fr/hal-01532188/file/bg-10-4493-2013.pdf doi:10.5194/bg-10-4493-2013 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/bg-10-4493-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
7 |
container_start_page |
4493 |
op_container_end_page |
4509 |
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