Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces-Geovide cruise)
6 pages, 3 figures, 1 table 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...
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Online Access: | http://hdl.handle.net/10261/163387 https://doi.org/10.1016/j.marchem.2017.11.006 https://doi.org/10.13039/501100003329 |
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ftcsic:oai:digital.csic.es:10261/163387 2024-02-11T09:59:47+01:00 Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces-Geovide cruise) Cossa, Daniel Heimbürger-Boavida, Lars-Eric Sonke, Jeroen E. Planquette, Helene Lherminier, Pascale García-Ibáñez, Maribel I. Pérez, Fiz F. Sarthou, G. Ministerio de Economía y Competitividad (España) 2018 http://hdl.handle.net/10261/163387 https://doi.org/10.1016/j.marchem.2017.11.006 https://doi.org/10.13039/501100003329 en eng Elsevier #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P Postprint http://dx.doi.org/10.1016/j.marchem.2017.11.006 Sí Marine Chemistry 198: 64-69 (2018) 0304-4203 http://hdl.handle.net/10261/163387 doi:10.1016/j.marchem.2017.11.006 http://dx.doi.org/10.13039/501100003329 open Labrador Sea Mercury North Atlantic artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.1016/j.marchem.2017.11.00610.13039/501100003329 2024-01-16T10:29:42Z 6 pages, 3 figures, 1 table 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 This research was funded by the French National Research Agency (ANR-13-BS06-0014), the French National Center for Scientific Research (Cnrs-Lefe-Cyber), the Global Mercury Observation System (GMOS, N°265113 European Union project), ... Article in Journal/Newspaper Arctic Archipelago Arctic Canadian Arctic Archipelago Greenland Labrador Sea North Atlantic Northeast Atlantic permafrost Digital.CSIC (Spanish National Research Council) 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 |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Labrador Sea Mercury North Atlantic |
spellingShingle |
Labrador Sea Mercury North Atlantic Cossa, Daniel Heimbürger-Boavida, Lars-Eric Sonke, Jeroen E. Planquette, Helene Lherminier, Pascale García-Ibáñez, Maribel I. Pérez, Fiz F. Sarthou, G. Sources, cycling and transfer of mercury in the Labrador Sea (Geotraces-Geovide cruise) |
topic_facet |
Labrador Sea Mercury North Atlantic |
description |
6 pages, 3 figures, 1 table 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 This research was funded by the French National Research Agency (ANR-13-BS06-0014), the French National Center for Scientific Research (Cnrs-Lefe-Cyber), the Global Mercury Observation System (GMOS, N°265113 European Union project), ... |
author2 |
Ministerio de Economía y Competitividad (España) |
format |
Article in Journal/Newspaper |
author |
Cossa, Daniel Heimbürger-Boavida, Lars-Eric Sonke, Jeroen E. Planquette, Helene Lherminier, Pascale García-Ibáñez, Maribel I. Pérez, Fiz F. Sarthou, G. |
author_facet |
Cossa, Daniel Heimbürger-Boavida, Lars-Eric Sonke, Jeroen E. Planquette, Helene Lherminier, Pascale García-Ibáñez, Maribel I. Pérez, Fiz F. 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 |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/163387 https://doi.org/10.1016/j.marchem.2017.11.006 https://doi.org/10.13039/501100003329 |
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_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2013-41048-P Postprint http://dx.doi.org/10.1016/j.marchem.2017.11.006 Sí Marine Chemistry 198: 64-69 (2018) 0304-4203 http://hdl.handle.net/10261/163387 doi:10.1016/j.marchem.2017.11.006 http://dx.doi.org/10.13039/501100003329 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.marchem.2017.11.00610.13039/501100003329 |
container_title |
Marine Chemistry |
container_volume |
198 |
container_start_page |
64 |
op_container_end_page |
69 |
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1790595539158433792 |