An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters
International audience To estimate the depth-integrated rate of photochemical processes involving chromophoric dissolved organic matter (CDOM) in coastal waters, the contribution of CDOM to the total absorption coefficient must be known from UV to green. At 307 sites sampled in various coastal marin...
Published in: | Journal of Geophysical Research |
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ftinsu:oai:HAL:hal-03494348v1 2024-02-11T10:02:30+01:00 An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters Belanger, Simon Babin, Marcel Larouche, Pierre Université du Québec à Rimouski (UQAR) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2008 https://hal.science/hal-03494348 https://hal.science/hal-03494348/document https://hal.science/hal-03494348/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202008%20-%20B%20langer%20-%20An%20empirical%20ocean%20color%20algorithm%20for%20estimating%20the.pdf https://doi.org/10.1029/2007JC004436 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004436 hal-03494348 https://hal.science/hal-03494348 https://hal.science/hal-03494348/document https://hal.science/hal-03494348/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202008%20-%20B%20langer%20-%20An%20empirical%20ocean%20color%20algorithm%20for%20estimating%20the.pdf doi:10.1029/2007JC004436 http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03494348 Journal of Geophysical Research. Oceans, 2008, 113 (C4), ⟨10.1029/2007JC004436⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2008 ftinsu https://doi.org/10.1029/2007JC004436 2024-01-24T17:30:27Z International audience To estimate the depth-integrated rate of photochemical processes involving chromophoric dissolved organic matter (CDOM) in coastal waters, the contribution of CDOM to the total absorption coefficient must be known from UV to green. At 307 sites sampled in various coastal marine environments, the ratio between CDOM and the total absorption coefficient ([a(CDOM/)a(t)]) at 412 nm was found to vary over a wide range, from 0.20 to 0.95. An empirical algorithm was developed to retrieve [a(CDOM)/a(t)](412) from satellite remote sensing reflectance. The absolute uncertainty on the [a(CDOM)/a(t)] retrieval was 0.14. As exemplified with the data from the Baltic and North Seas, the algorithm provides a means to distinguish the contribution of CDOM to the absorption coefficient of colored detrital material (i.e., CDM = CDOM + nonalgal particles) at the regional scale. The implications of the variability in the magnitude and spectral shape of [a(CDOM)/a(t)] for the assessment of depth-integrated production of any photoproducts involving CDOM photolysis are discussed in details. We applied the algorithm to a Sea-viewing Wide Field-of-View Sensor (SeaWiFS) image of the Southeastern Beaufort Sea where terrestrial inputs are abundant. The spatial variability in the [a(CDOM)/a(t)] reaches as much as threefold over the continental shelf and beyond. These results clearly show that it is necessary to account for the spatial variability of [a(CDOM)/a(t)] when quantifying CDOM-related photochemical processes in the ocean. Article in Journal/Newspaper Beaufort Sea Institut national des sciences de l'Univers: HAL-INSU Journal of Geophysical Research 113 C4 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Belanger, Simon Babin, Marcel Larouche, Pierre An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience To estimate the depth-integrated rate of photochemical processes involving chromophoric dissolved organic matter (CDOM) in coastal waters, the contribution of CDOM to the total absorption coefficient must be known from UV to green. At 307 sites sampled in various coastal marine environments, the ratio between CDOM and the total absorption coefficient ([a(CDOM/)a(t)]) at 412 nm was found to vary over a wide range, from 0.20 to 0.95. An empirical algorithm was developed to retrieve [a(CDOM)/a(t)](412) from satellite remote sensing reflectance. The absolute uncertainty on the [a(CDOM)/a(t)] retrieval was 0.14. As exemplified with the data from the Baltic and North Seas, the algorithm provides a means to distinguish the contribution of CDOM to the absorption coefficient of colored detrital material (i.e., CDM = CDOM + nonalgal particles) at the regional scale. The implications of the variability in the magnitude and spectral shape of [a(CDOM)/a(t)] for the assessment of depth-integrated production of any photoproducts involving CDOM photolysis are discussed in details. We applied the algorithm to a Sea-viewing Wide Field-of-View Sensor (SeaWiFS) image of the Southeastern Beaufort Sea where terrestrial inputs are abundant. The spatial variability in the [a(CDOM)/a(t)] reaches as much as threefold over the continental shelf and beyond. These results clearly show that it is necessary to account for the spatial variability of [a(CDOM)/a(t)] when quantifying CDOM-related photochemical processes in the ocean. |
author2 |
Université du Québec à Rimouski (UQAR) Laboratoire d'océanographie de Villefranche (LOV) Observatoire océanologique de Villefranche-sur-mer (OOVM) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Belanger, Simon Babin, Marcel Larouche, Pierre |
author_facet |
Belanger, Simon Babin, Marcel Larouche, Pierre |
author_sort |
Belanger, Simon |
title |
An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
title_short |
An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
title_full |
An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
title_fullStr |
An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
title_full_unstemmed |
An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
title_sort |
empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.science/hal-03494348 https://hal.science/hal-03494348/document https://hal.science/hal-03494348/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202008%20-%20B%20langer%20-%20An%20empirical%20ocean%20color%20algorithm%20for%20estimating%20the.pdf https://doi.org/10.1029/2007JC004436 |
genre |
Beaufort Sea |
genre_facet |
Beaufort Sea |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.science/hal-03494348 Journal of Geophysical Research. Oceans, 2008, 113 (C4), ⟨10.1029/2007JC004436⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JC004436 hal-03494348 https://hal.science/hal-03494348 https://hal.science/hal-03494348/document https://hal.science/hal-03494348/file/Journal%20of%20Geophysical%20Research%20Oceans%20-%202008%20-%20B%20langer%20-%20An%20empirical%20ocean%20color%20algorithm%20for%20estimating%20the.pdf doi:10.1029/2007JC004436 |
op_rights |
http://hal.archives-ouvertes.fr/licences/copyright/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2007JC004436 |
container_title |
Journal of Geophysical Research |
container_volume |
113 |
container_issue |
C4 |
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1790598514399510528 |