Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx
Although not systematically considered as oxygen minimum zones, River-dominated Ocean Margins are sensitive to oxygen depletions. For example, the continental shelf off the Gironde, which flows into the Bay of Biscay, had not yet been studied from this perspective although recent simulations suggest...
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ftfrontimediafig:oai:figshare.com:article/21292563 2023-05-15T17:38:36+02:00 Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx Nicolas Dubosq Sabine Schmidt Joël Sudre Sylvain Rigaud Bastien Lamarque Martin Danilo Antoine Grémare Bruno Deflandre 2022-10-07T04:39:49Z https://doi.org/10.3389/fmars.2022.1006453.s003 https://figshare.com/articles/dataset/Table_1_First_observations_of_seasonal_bottom_water_deoxygenation_off_the_Gironde_estuary_Bay_of_Biscay_North_East_Atlantic_xlsx/21292563 unknown doi:10.3389/fmars.2022.1006453.s003 https://figshare.com/articles/dataset/Table_1_First_observations_of_seasonal_bottom_water_deoxygenation_off_the_Gironde_estuary_Bay_of_Biscay_North_East_Atlantic_xlsx/21292563 CC BY 4.0 CC-BY Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering deoxygenation continental shelf seasonal evolution stratification Bay of Biscay dissolved oxygen Dataset 2022 ftfrontimediafig https://doi.org/10.3389/fmars.2022.1006453.s003 2022-10-12T23:10:25Z Although not systematically considered as oxygen minimum zones, River-dominated Ocean Margins are sensitive to oxygen depletions. For example, the continental shelf off the Gironde, which flows into the Bay of Biscay, had not yet been studied from this perspective although recent simulations suggested that this area should already have experienced deoxygenations in recent decades. To fill this gap, profiles of temperature, salinity and dissolved oxygen were performed in the water column of the continental shelf off the Gironde during seven cruises distributed over the different seasons between 2016 and 2021. Turbidity, chlorophyll-a and pH were also measured during some of these cruises. In winter, the water column was slightly stratified due to high river flows. Then, a seasonal thermal stratification was present from spring to autumn. Similarly, dissolved oxygen showed a seasonal dynamic with: a well-oxygenated water column in winter, an oxygen oversaturation in the first 20 meters during the spring bloom, and then a progressive oxygen depletion in bottom waters until reaching an oxygen saturation minimum down to 45% in autumn. These deoxygenations are explained by the seasonal stratification that isolates the bottom waters from spring to autumn, and are likely enhanced by the advection of deoxygenated waters from the north of the Bay of Biscay and the settling of the organic matter produced in surface waters. A better understanding of these processes in the context of global warming undoubtedly requires better documentation of dissolved oxygen variability through the implementation of a long-term and continuous in situ monitoring. Dataset North East Atlantic Frontiers: Figshare |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering deoxygenation continental shelf seasonal evolution stratification Bay of Biscay dissolved oxygen |
spellingShingle |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering deoxygenation continental shelf seasonal evolution stratification Bay of Biscay dissolved oxygen Nicolas Dubosq Sabine Schmidt Joël Sudre Sylvain Rigaud Bastien Lamarque Martin Danilo Antoine Grémare Bruno Deflandre Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
topic_facet |
Oceanography Marine Biology Marine Geoscience Biological Oceanography Chemical Oceanography Physical Oceanography Marine Engineering deoxygenation continental shelf seasonal evolution stratification Bay of Biscay dissolved oxygen |
description |
Although not systematically considered as oxygen minimum zones, River-dominated Ocean Margins are sensitive to oxygen depletions. For example, the continental shelf off the Gironde, which flows into the Bay of Biscay, had not yet been studied from this perspective although recent simulations suggested that this area should already have experienced deoxygenations in recent decades. To fill this gap, profiles of temperature, salinity and dissolved oxygen were performed in the water column of the continental shelf off the Gironde during seven cruises distributed over the different seasons between 2016 and 2021. Turbidity, chlorophyll-a and pH were also measured during some of these cruises. In winter, the water column was slightly stratified due to high river flows. Then, a seasonal thermal stratification was present from spring to autumn. Similarly, dissolved oxygen showed a seasonal dynamic with: a well-oxygenated water column in winter, an oxygen oversaturation in the first 20 meters during the spring bloom, and then a progressive oxygen depletion in bottom waters until reaching an oxygen saturation minimum down to 45% in autumn. These deoxygenations are explained by the seasonal stratification that isolates the bottom waters from spring to autumn, and are likely enhanced by the advection of deoxygenated waters from the north of the Bay of Biscay and the settling of the organic matter produced in surface waters. A better understanding of these processes in the context of global warming undoubtedly requires better documentation of dissolved oxygen variability through the implementation of a long-term and continuous in situ monitoring. |
format |
Dataset |
author |
Nicolas Dubosq Sabine Schmidt Joël Sudre Sylvain Rigaud Bastien Lamarque Martin Danilo Antoine Grémare Bruno Deflandre |
author_facet |
Nicolas Dubosq Sabine Schmidt Joël Sudre Sylvain Rigaud Bastien Lamarque Martin Danilo Antoine Grémare Bruno Deflandre |
author_sort |
Nicolas Dubosq |
title |
Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
title_short |
Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
title_full |
Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
title_fullStr |
Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
title_full_unstemmed |
Table_1_First observations of seasonal bottom water deoxygenation off the Gironde estuary (Bay of Biscay, North East Atlantic).xlsx |
title_sort |
table_1_first observations of seasonal bottom water deoxygenation off the gironde estuary (bay of biscay, north east atlantic).xlsx |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.1006453.s003 https://figshare.com/articles/dataset/Table_1_First_observations_of_seasonal_bottom_water_deoxygenation_off_the_Gironde_estuary_Bay_of_Biscay_North_East_Atlantic_xlsx/21292563 |
genre |
North East Atlantic |
genre_facet |
North East Atlantic |
op_relation |
doi:10.3389/fmars.2022.1006453.s003 https://figshare.com/articles/dataset/Table_1_First_observations_of_seasonal_bottom_water_deoxygenation_off_the_Gironde_estuary_Bay_of_Biscay_North_East_Atlantic_xlsx/21292563 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/fmars.2022.1006453.s003 |
_version_ |
1766139125364162560 |