Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships
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 der...
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ftcopernicus:oai:publications.copernicus.org:bg19035 2023-05-15T14:55:42+02:00 Apparent optical properties of the Canadian Beaufort Sea – Part 1: Observational overview and water column relationships Antoine, D. Hooker, S. B. Bélanger, S. Matsuoka, A. Babin, M. 2018-09-27 application/pdf https://doi.org/10.5194/bg-10-4493-2013 https://www.biogeosciences.net/10/4493/2013/ eng eng doi:10.5194/bg-10-4493-2013 https://www.biogeosciences.net/10/4493/2013/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-10-4493-2013 2019-12-24T09:55:15Z 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, K d , and the spectral remote sensing reflectance, R rs . 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 K d 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 K d 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 R rs 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. Text Arctic Beaufort Sea Mackenzie river Copernicus Publications: E-Journals Arctic Mackenzie River Biogeosciences 10 7 4493 4509 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
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, K d , and the spectral remote sensing reflectance, R rs . 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 K d 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 K d 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 R rs 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. |
format |
Text |
author |
Antoine, D. Hooker, S. B. Bélanger, S. Matsuoka, A. Babin, M. |
spellingShingle |
Antoine, D. 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 |
author_facet |
Antoine, D. Hooker, S. B. Bélanger, S. Matsuoka, A. Babin, M. |
author_sort |
Antoine, D. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-10-4493-2013 https://www.biogeosciences.net/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 |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-10-4493-2013 https://www.biogeosciences.net/10/4493/2013/ |
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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1766327728318971904 |