Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise)
The Labrador Sea links the Arctic and North Atlantic oceans and constitutes one of the main entrances of atmospheric inputs into the Ocean's interior. We report here the first high-resolution Hg distribution pattern along a transect from Greenland to Labrador coasts sampled after the 2014 winte...
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier Science Bv
2018
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Online Access: | https://archimer.ifremer.fr/doc/00411/52207/52929.pdf https://doi.org/10.1016/j.marchem.2017.11.006 https://archimer.ifremer.fr/doc/00411/52207/ |
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ftarchimer:oai:archimer.ifremer.fr:52207 2023-05-15T14:28:46+02:00 Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) Cossa, Daniel Heimburger, L. E. Sonke, J. E. Planquette, H. Lherminier, Pascale Garcia-ibanez, Maria Isabel Perez, Ff Sarthou, G. 2018-01 application/pdf https://archimer.ifremer.fr/doc/00411/52207/52929.pdf https://doi.org/10.1016/j.marchem.2017.11.006 https://archimer.ifremer.fr/doc/00411/52207/ eng eng Elsevier Science Bv https://archimer.ifremer.fr/doc/00411/52207/52929.pdf doi:10.1016/j.marchem.2017.11.006 https://archimer.ifremer.fr/doc/00411/52207/ 2017 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use Marine Chemistry (0304-4203) (Elsevier Science Bv), 2018-01 , Vol. 198 , P. 64-69 Labrador Sea Mercury North Atlantic text Publication info:eu-repo/semantics/article 2018 ftarchimer https://doi.org/10.1016/j.marchem.2017.11.006 2021-09-23T20:30:05Z The Labrador Sea links the Arctic and North Atlantic oceans and constitutes one of the main entrances of atmospheric inputs into the Ocean's interior. We report here the first high-resolution Hg distribution pattern along a transect from Greenland to Labrador coasts sampled after the 2014 winter convection. Total Hg concentrations in unfiltered (HgTUNF) samples ranged from 0.25 pmol L− 1 to 0.67 pmol L− 1 averaging 0.44 ± 0.10 pmol L− 1 (n = 113, 1σ). Concentrations in filtered samples (HgTF, < 0.45 μm) represented from 62 to 92% of the HgTUNF and exhibited a similar distribution. High HgTUNF concentrations were found (i) in the waters of the Labrador Current, which receive desalted waters from the Canadian Arctic Archipelago, and (ii) in the waters over the Labrador shelf and rise. In the Labrador Sea Waters formed during the 2014 winter convection, HgTUNF concentrations were low (0.38 ± 0.05 pmol L− 1, n = 23), and increased gradually with depth (up to > 0.5 pmol L− 1) in the Northeast Atlantic Deep Waters. HgTF correlates with apparent oxygen utilization implying that atmospheric deposition, biological uptake, and microbial respiration control the Hg distribution in the Labrador Sea. Subtracting the amount of Hg released during organic matter remineralization allows us to identify a Hg and organic matter enriched fraction, which originates from fluvial sources in the Canadian Arctic Archipelago waters. This fraction is transferred southward, in surface waters with the Labrador Current, and at depth with the lower limb of the Atlantic Meridional Overturning Circulation. Climate warming, which will increase the mobilization of Hg from thawing permafrost, would consequently increase the Arctic export of Hg initially associated with organic matter. Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Labrador Sea North Atlantic Northeast Atlantic permafrost Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Canadian Arctic Archipelago Greenland Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) Marine Chemistry 198 64 69 |
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 |
topic |
Labrador Sea Mercury North Atlantic |
spellingShingle |
Labrador Sea Mercury North Atlantic Cossa, Daniel Heimburger, L. E. Sonke, J. E. Planquette, H. Lherminier, Pascale Garcia-ibanez, Maria Isabel Perez, Ff Sarthou, G. Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
topic_facet |
Labrador Sea Mercury North Atlantic |
description |
The Labrador Sea links the Arctic and North Atlantic oceans and constitutes one of the main entrances of atmospheric inputs into the Ocean's interior. We report here the first high-resolution Hg distribution pattern along a transect from Greenland to Labrador coasts sampled after the 2014 winter convection. Total Hg concentrations in unfiltered (HgTUNF) samples ranged from 0.25 pmol L− 1 to 0.67 pmol L− 1 averaging 0.44 ± 0.10 pmol L− 1 (n = 113, 1σ). Concentrations in filtered samples (HgTF, < 0.45 μm) represented from 62 to 92% of the HgTUNF and exhibited a similar distribution. High HgTUNF concentrations were found (i) in the waters of the Labrador Current, which receive desalted waters from the Canadian Arctic Archipelago, and (ii) in the waters over the Labrador shelf and rise. In the Labrador Sea Waters formed during the 2014 winter convection, HgTUNF concentrations were low (0.38 ± 0.05 pmol L− 1, n = 23), and increased gradually with depth (up to > 0.5 pmol L− 1) in the Northeast Atlantic Deep Waters. HgTF correlates with apparent oxygen utilization implying that atmospheric deposition, biological uptake, and microbial respiration control the Hg distribution in the Labrador Sea. Subtracting the amount of Hg released during organic matter remineralization allows us to identify a Hg and organic matter enriched fraction, which originates from fluvial sources in the Canadian Arctic Archipelago waters. This fraction is transferred southward, in surface waters with the Labrador Current, and at depth with the lower limb of the Atlantic Meridional Overturning Circulation. Climate warming, which will increase the mobilization of Hg from thawing permafrost, would consequently increase the Arctic export of Hg initially associated with organic matter. |
format |
Article in Journal/Newspaper |
author |
Cossa, Daniel Heimburger, L. E. Sonke, J. E. Planquette, H. Lherminier, Pascale Garcia-ibanez, Maria Isabel Perez, Ff Sarthou, G. |
author_facet |
Cossa, Daniel Heimburger, L. E. Sonke, J. E. Planquette, H. Lherminier, Pascale Garcia-ibanez, Maria Isabel Perez, Ff Sarthou, G. |
author_sort |
Cossa, Daniel |
title |
Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
title_short |
Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
title_full |
Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
title_fullStr |
Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
title_full_unstemmed |
Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces -Geovide cruise) |
title_sort |
sources, cycling and transfer of mercury in the labrador sea (geotraces -geovide cruise) |
publisher |
Elsevier Science Bv |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00411/52207/52929.pdf https://doi.org/10.1016/j.marchem.2017.11.006 https://archimer.ifremer.fr/doc/00411/52207/ |
long_lat |
ENVELOPE(-58.000,-58.000,56.000,56.000) |
geographic |
Arctic Canadian Arctic Archipelago Greenland Labrador Shelf |
geographic_facet |
Arctic Canadian Arctic Archipelago Greenland Labrador Shelf |
genre |
Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Labrador Sea North Atlantic Northeast Atlantic permafrost |
genre_facet |
Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Labrador Sea North Atlantic Northeast Atlantic permafrost |
op_source |
Marine Chemistry (0304-4203) (Elsevier Science Bv), 2018-01 , Vol. 198 , P. 64-69 |
op_relation |
https://archimer.ifremer.fr/doc/00411/52207/52929.pdf doi:10.1016/j.marchem.2017.11.006 https://archimer.ifremer.fr/doc/00411/52207/ |
op_rights |
2017 Elsevier B.V. All rights reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1016/j.marchem.2017.11.006 |
container_title |
Marine Chemistry |
container_volume |
198 |
container_start_page |
64 |
op_container_end_page |
69 |
_version_ |
1766302925840187392 |