Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected
The North Brazil Current (NBC) flows northward across the Equator, passes the mouth of the Amazon River, and forms large oceanic eddies near 8° N. We investigate the processes driving the variability of air-sea CO2 fluxes at different scales in early 2020 in the region [50° W–59° W–5° N–16° N]. This...
Published in: | Biogeosciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus GmbH
2022
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Online Access: | https://archimer.ifremer.fr/doc/00738/85015/89969.pdf https://archimer.ifremer.fr/doc/00738/85015/89970.pdf https://archimer.ifremer.fr/doc/00738/85015/94583.pdf https://archimer.ifremer.fr/doc/00738/85015/94584.pdf https://doi.org/10.5194/bg-19-2969-2022 https://archimer.ifremer.fr/doc/00738/85015/ |
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ftarchimer:oai:archimer.ifremer.fr:85015 2023-05-15T17:31:35+02:00 Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected Olivier, Léa Boutin, Jacqueline Reverdin, Gilles Lefèvre, Nathalie Landschützer, Peter Speich, Sabrina Karstensen, Johannes Ritschel, Markus Wanninkhof, Rik 2022-06 application/pdf https://archimer.ifremer.fr/doc/00738/85015/89969.pdf https://archimer.ifremer.fr/doc/00738/85015/89970.pdf https://archimer.ifremer.fr/doc/00738/85015/94583.pdf https://archimer.ifremer.fr/doc/00738/85015/94584.pdf https://doi.org/10.5194/bg-19-2969-2022 https://archimer.ifremer.fr/doc/00738/85015/ eng eng Copernicus GmbH https://archimer.ifremer.fr/doc/00738/85015/89969.pdf https://archimer.ifremer.fr/doc/00738/85015/89970.pdf https://archimer.ifremer.fr/doc/00738/85015/94583.pdf https://archimer.ifremer.fr/doc/00738/85015/94584.pdf doi:10.5194/bg-19-2969-2022 https://archimer.ifremer.fr/doc/00738/85015/ info:eu-repo/semantics/openAccess restricted use Biogeosciences (1726-4170) (Copernicus GmbH), 2022-06 , Vol. 19 , N. 12 , P. 2969-2988 text Publication info:eu-repo/semantics/article 2022 ftarchimer https://doi.org/10.5194/bg-19-2969-2022 2023-03-14T23:55:18Z The North Brazil Current (NBC) flows northward across the Equator, passes the mouth of the Amazon River, and forms large oceanic eddies near 8° N. We investigate the processes driving the variability of air-sea CO2 fluxes at different scales in early 2020 in the region [50° W–59° W–5° N–16° N]. This region is a pathway between the equatorial and North Atlantic Ocean and was surveyed during the EUREC4A-OA/ATOMIC campaign. In-situ surface fugacity of CO2 (fCO2), salinity and temperature combined with maps of satellite salinity, chlorophyll-a and temperature highlight contrasting properties in the region. In February 2020, the area is a CO2 sink (−1.7 TgC.month−1), previously underestimated by a factor 10. The NBC rings transport saline and high fCO2 water indicative of their equatorial origins and are a small source of CO2 at regional scale. Their main impact on the variability of biogeochemical parameters is through the filaments they entrain into the open ocean. During the campaign, a nutrient-rich freshwater plume from the Amazon River is entrained from the shelf up to 12° N and caused a phytoplankton bloom leading to a significant carbon drawdown (~20 % of the total sink). On the other hand, saltier filaments of shelf water rich in detrital material act as strong local sources of CO2. Spatial distribution of fCO2 is therefore strongly influenced by ocean dynamics south of 12° N. The less variable North Atlantic subtropical water extends from Barbados northward. They represent ~60 % of the total sink due to their lower temperature associated with winter cooling and strong winds. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Biogeosciences 19 12 2969 2988 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
The North Brazil Current (NBC) flows northward across the Equator, passes the mouth of the Amazon River, and forms large oceanic eddies near 8° N. We investigate the processes driving the variability of air-sea CO2 fluxes at different scales in early 2020 in the region [50° W–59° W–5° N–16° N]. This region is a pathway between the equatorial and North Atlantic Ocean and was surveyed during the EUREC4A-OA/ATOMIC campaign. In-situ surface fugacity of CO2 (fCO2), salinity and temperature combined with maps of satellite salinity, chlorophyll-a and temperature highlight contrasting properties in the region. In February 2020, the area is a CO2 sink (−1.7 TgC.month−1), previously underestimated by a factor 10. The NBC rings transport saline and high fCO2 water indicative of their equatorial origins and are a small source of CO2 at regional scale. Their main impact on the variability of biogeochemical parameters is through the filaments they entrain into the open ocean. During the campaign, a nutrient-rich freshwater plume from the Amazon River is entrained from the shelf up to 12° N and caused a phytoplankton bloom leading to a significant carbon drawdown (~20 % of the total sink). On the other hand, saltier filaments of shelf water rich in detrital material act as strong local sources of CO2. Spatial distribution of fCO2 is therefore strongly influenced by ocean dynamics south of 12° N. The less variable North Atlantic subtropical water extends from Barbados northward. They represent ~60 % of the total sink due to their lower temperature associated with winter cooling and strong winds. |
format |
Article in Journal/Newspaper |
author |
Olivier, Léa Boutin, Jacqueline Reverdin, Gilles Lefèvre, Nathalie Landschützer, Peter Speich, Sabrina Karstensen, Johannes Ritschel, Markus Wanninkhof, Rik |
spellingShingle |
Olivier, Léa Boutin, Jacqueline Reverdin, Gilles Lefèvre, Nathalie Landschützer, Peter Speich, Sabrina Karstensen, Johannes Ritschel, Markus Wanninkhof, Rik Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
author_facet |
Olivier, Léa Boutin, Jacqueline Reverdin, Gilles Lefèvre, Nathalie Landschützer, Peter Speich, Sabrina Karstensen, Johannes Ritschel, Markus Wanninkhof, Rik |
author_sort |
Olivier, Léa |
title |
Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
title_short |
Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
title_full |
Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
title_fullStr |
Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
title_full_unstemmed |
Wintertime process study of the North Brazil Current rings reveals the region as a larger sink for CO2 than expected |
title_sort |
wintertime process study of the north brazil current rings reveals the region as a larger sink for co2 than expected |
publisher |
Copernicus GmbH |
publishDate |
2022 |
url |
https://archimer.ifremer.fr/doc/00738/85015/89969.pdf https://archimer.ifremer.fr/doc/00738/85015/89970.pdf https://archimer.ifremer.fr/doc/00738/85015/94583.pdf https://archimer.ifremer.fr/doc/00738/85015/94584.pdf https://doi.org/10.5194/bg-19-2969-2022 https://archimer.ifremer.fr/doc/00738/85015/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Biogeosciences (1726-4170) (Copernicus GmbH), 2022-06 , Vol. 19 , N. 12 , P. 2969-2988 |
op_relation |
https://archimer.ifremer.fr/doc/00738/85015/89969.pdf https://archimer.ifremer.fr/doc/00738/85015/89970.pdf https://archimer.ifremer.fr/doc/00738/85015/94583.pdf https://archimer.ifremer.fr/doc/00738/85015/94584.pdf doi:10.5194/bg-19-2969-2022 https://archimer.ifremer.fr/doc/00738/85015/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.5194/bg-19-2969-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
12 |
container_start_page |
2969 |
op_container_end_page |
2988 |
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1766129240637440000 |