Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study
We present a three-dimensional physical-biological modelling study aiming to infer the effect of freshwater-associated bulk turbidity on the Gulf of St. Lawrence (Canada) plankton ecosystem. Bulk turbidity is parameterised using an inverse relationship derived from an extensive in situ dataset linki...
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ftccsdartic:oai:HAL:hal-00724976v1 2023-05-15T18:28:33+02:00 Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study Le Fouest, V. ZAKARDJIAN, Bruno Saucier, F. J. Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) 2010 https://hal.archives-ouvertes.fr/hal-00724976 en eng HAL CCSD Elsevier hal-00724976 https://hal.archives-ouvertes.fr/hal-00724976 ISSN: 0924-7963 Journal of Marine Systems https://hal.archives-ouvertes.fr/hal-00724976 Journal of Marine Systems, Elsevier, 2010, 81, pp.75-85 Biological oceanography Physical oceanography Plankton River plumes Modelling DISSOLVED ORGANIC-MATTER BALTIC SEA PHYTOPLANKTON BLOOM COASTAL JET ESTUARY OCEAN ABSORPTION VARIABILITY NUTRIENTS CARBON [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2010 ftccsdartic 2021-10-24T16:09:40Z We present a three-dimensional physical-biological modelling study aiming to infer the effect of freshwater-associated bulk turbidity on the Gulf of St. Lawrence (Canada) plankton ecosystem. Bulk turbidity is parameterised using an inverse relationship derived from an extensive in situ dataset linking salinity to the diffuse attenuation coefficient of photosynthetically available radiation (PAR) due to nonchlorophyllous matter. Embedding bulk turbidity in the model led to shallowing of the photic zone in the estuarine plume in accordance with coincident observations and allowed a better discrimination between Case 1 (chlorophyll-mediated variability of the photosynthetic available radiation attenuation) and Case 2 waters. The spring bloom was delayed. and primary and secondary production rates as well as the export of biogenic matter at depth decreased in the freshwater-influenced subregions. Comparisons with literature and coincident in situ measurements showed that nitrates were over- and underestimated in the run with and without bulk turbidity, respectively. A sensitivity analysis was performed with a relatively simple but robust parameterisation of photoacclimation, i.e. the adjustment of the phytoplankton photosynthetic efficiency to local underwater light conditions. Photoacclimation allowed simulated chlorophyll and nitrate concentrations as well as lateral fluxes of nitrate to achieve the best agreement with coincident measurements and literature estimates, respectively. This study showed that accounting for the freshwater-associated bio-optical variability and phytoplankton response in terms of photosynthetic efficiency improved the model's ability to predict the plankton ecosystem dynamics and associated biogeochemical fluxes in the river-influenced Gulf of St. Lawrence. (C) 2010 Elsevier B.V. All rights reserved. Article in Journal/Newspaper Subarctic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Canada |
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 |
Biological oceanography Physical oceanography Plankton River plumes Modelling DISSOLVED ORGANIC-MATTER BALTIC SEA PHYTOPLANKTON BLOOM COASTAL JET ESTUARY OCEAN ABSORPTION VARIABILITY NUTRIENTS CARBON [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Biological oceanography Physical oceanography Plankton River plumes Modelling DISSOLVED ORGANIC-MATTER BALTIC SEA PHYTOPLANKTON BLOOM COASTAL JET ESTUARY OCEAN ABSORPTION VARIABILITY NUTRIENTS CARBON [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Le Fouest, V. ZAKARDJIAN, Bruno Saucier, F. J. Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
topic_facet |
Biological oceanography Physical oceanography Plankton River plumes Modelling DISSOLVED ORGANIC-MATTER BALTIC SEA PHYTOPLANKTON BLOOM COASTAL JET ESTUARY OCEAN ABSORPTION VARIABILITY NUTRIENTS CARBON [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
We present a three-dimensional physical-biological modelling study aiming to infer the effect of freshwater-associated bulk turbidity on the Gulf of St. Lawrence (Canada) plankton ecosystem. Bulk turbidity is parameterised using an inverse relationship derived from an extensive in situ dataset linking salinity to the diffuse attenuation coefficient of photosynthetically available radiation (PAR) due to nonchlorophyllous matter. Embedding bulk turbidity in the model led to shallowing of the photic zone in the estuarine plume in accordance with coincident observations and allowed a better discrimination between Case 1 (chlorophyll-mediated variability of the photosynthetic available radiation attenuation) and Case 2 waters. The spring bloom was delayed. and primary and secondary production rates as well as the export of biogenic matter at depth decreased in the freshwater-influenced subregions. Comparisons with literature and coincident in situ measurements showed that nitrates were over- and underestimated in the run with and without bulk turbidity, respectively. A sensitivity analysis was performed with a relatively simple but robust parameterisation of photoacclimation, i.e. the adjustment of the phytoplankton photosynthetic efficiency to local underwater light conditions. Photoacclimation allowed simulated chlorophyll and nitrate concentrations as well as lateral fluxes of nitrate to achieve the best agreement with coincident measurements and literature estimates, respectively. This study showed that accounting for the freshwater-associated bio-optical variability and phytoplankton response in terms of photosynthetic efficiency improved the model's ability to predict the plankton ecosystem dynamics and associated biogeochemical fluxes in the river-influenced Gulf of St. Lawrence. (C) 2010 Elsevier B.V. All rights reserved. |
author2 |
Laboratoire de sondages électromagnétiques de l'environnement terrestre (LSEET) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Le Fouest, V. ZAKARDJIAN, Bruno Saucier, F. J. |
author_facet |
Le Fouest, V. ZAKARDJIAN, Bruno Saucier, F. J. |
author_sort |
Le Fouest, V. |
title |
Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
title_short |
Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
title_full |
Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
title_fullStr |
Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
title_full_unstemmed |
Plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic Gulf of St. Lawrence (Canada): A modelling study |
title_sort |
plankton ecosystem response to freshwater-associated bulk turbidity in the subarctic gulf of st. lawrence (canada): a modelling study |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.archives-ouvertes.fr/hal-00724976 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
ISSN: 0924-7963 Journal of Marine Systems https://hal.archives-ouvertes.fr/hal-00724976 Journal of Marine Systems, Elsevier, 2010, 81, pp.75-85 |
op_relation |
hal-00724976 https://hal.archives-ouvertes.fr/hal-00724976 |
_version_ |
1766211065362776064 |