Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect
We report here the results of total mercury (HgT) determinations along the 2014 Geotraces Geovide cruise (GA01 transect) in the North Atlantic Ocean (NA) from Lisbon (Portugal) to the coast of Labrador (Canada). HgT concentrations in unfiltered samples (HgTUNF) were log-normally distributed and rang...
Published in: | Biogeosciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications (EGU)
2018
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Online Access: | https://oceanrep.geomar.de/id/eprint/42925/ https://oceanrep.geomar.de/id/eprint/42925/1/bg-15-2309-2018.pdf https://oceanrep.geomar.de/id/eprint/42925/2/bg-15-2309-2018-supplement.pdf https://doi.org/10.5194/bg-15-2309-2018 |
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ftoceanrep:oai:oceanrep.geomar.de:42925 2023-05-15T16:28:43+02:00 Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect Cossa, Daniel Heimbürger, Lars-Eric Pérez, Fiz F. García-Ibáñez, Maribel I. Sonke, Jeroen E. Planquette, Hélène Lherminier, Pascale Boutorh, Julia Cheize, Marie Menzel Barraqueta, Jan Lukas Shelley, Rachel Sarthou, Géraldine 2018 text https://oceanrep.geomar.de/id/eprint/42925/ https://oceanrep.geomar.de/id/eprint/42925/1/bg-15-2309-2018.pdf https://oceanrep.geomar.de/id/eprint/42925/2/bg-15-2309-2018-supplement.pdf https://doi.org/10.5194/bg-15-2309-2018 en eng Copernicus Publications (EGU) https://oceanrep.geomar.de/id/eprint/42925/1/bg-15-2309-2018.pdf https://oceanrep.geomar.de/id/eprint/42925/2/bg-15-2309-2018-supplement.pdf Cossa, D., Heimbürger, L. E., Pérez, F. F., García-Ibáñez, M. I., Sonke, J. E., Planquette, H., Lherminier, P., Boutorh, J., Cheize, M., Menzel Barraqueta, J. L. , Shelley, R. and Sarthou, G. (2018) Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect. Open Access Biogeosciences (BG), 15 (8). pp. 2309-2323. DOI 10.5194/bg-15-2309-2018 <https://doi.org/10.5194/bg-15-2309-2018>. doi:10.5194/bg-15-2309-2018 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2018 ftoceanrep https://doi.org/10.5194/bg-15-2309-2018 2023-04-07T15:39:40Z We report here the results of total mercury (HgT) determinations along the 2014 Geotraces Geovide cruise (GA01 transect) in the North Atlantic Ocean (NA) from Lisbon (Portugal) to the coast of Labrador (Canada). HgT concentrations in unfiltered samples (HgTUNF) were log-normally distributed and ranged between 0.16 and 1.54 pmol L−1, with a geometric mean of 0.51 pmol L−1 for the 535 samples analysed. The dissolved fraction (< 0.45 µm) of HgT (HgTF), determined on 141 samples, averaged 78 % of the HgTUNF for the entire data set, 84 % for open seawaters (below 100 m) and 91 % if the Labrador Sea data are excluded, where the primary production was high (with a winter convection down to 1400 m). HgTUNF concentrations increased eastwards and with depth from Greenland to Europe and from subsurface to bottom waters. The HgTUNF concentrations were similarly low in the subpolar gyre waters ( ∼ 0.45 pmol L−1), whereas they exceeded 0.60 pmol L−1 in the subtropical gyre waters. The HgTUNF distribution mirrored that of dissolved oxygen concentration, with highest concentration levels associated with oxygen-depleted zones. The relationship between HgTF and the apparent oxygen utilization confirms the nutrient-like behaviour of Hg in the NA. An extended optimum multiparameter analysis allowed us to characterize HgTUNF concentrations in the different source water types (SWTs) present along the transect. The distribution pattern of HgTUNF, modelled by the mixing of SWTs, show Hg enrichment in Mediterranean waters and North East Atlantic Deep Water and low concentrations in young waters formed in the subpolar gyre and Nordic seas. The change in anthropogenic Hg concentrations in the Labrador Sea Water during its eastward journey suggests a continuous decrease in Hg content in this water mass over the last decades. Calculation of the water transport driven by the Atlantic Meridional Overturning Circulation across the Portugal–Greenland transect indicates northward Hg transport within the upper limb and southward Hg transport ... Article in Journal/Newspaper Greenland Labrador Sea Nordic Seas North Atlantic North East Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Canada Greenland Biogeosciences 15 8 2309 2323 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
We report here the results of total mercury (HgT) determinations along the 2014 Geotraces Geovide cruise (GA01 transect) in the North Atlantic Ocean (NA) from Lisbon (Portugal) to the coast of Labrador (Canada). HgT concentrations in unfiltered samples (HgTUNF) were log-normally distributed and ranged between 0.16 and 1.54 pmol L−1, with a geometric mean of 0.51 pmol L−1 for the 535 samples analysed. The dissolved fraction (< 0.45 µm) of HgT (HgTF), determined on 141 samples, averaged 78 % of the HgTUNF for the entire data set, 84 % for open seawaters (below 100 m) and 91 % if the Labrador Sea data are excluded, where the primary production was high (with a winter convection down to 1400 m). HgTUNF concentrations increased eastwards and with depth from Greenland to Europe and from subsurface to bottom waters. The HgTUNF concentrations were similarly low in the subpolar gyre waters ( ∼ 0.45 pmol L−1), whereas they exceeded 0.60 pmol L−1 in the subtropical gyre waters. The HgTUNF distribution mirrored that of dissolved oxygen concentration, with highest concentration levels associated with oxygen-depleted zones. The relationship between HgTF and the apparent oxygen utilization confirms the nutrient-like behaviour of Hg in the NA. An extended optimum multiparameter analysis allowed us to characterize HgTUNF concentrations in the different source water types (SWTs) present along the transect. The distribution pattern of HgTUNF, modelled by the mixing of SWTs, show Hg enrichment in Mediterranean waters and North East Atlantic Deep Water and low concentrations in young waters formed in the subpolar gyre and Nordic seas. The change in anthropogenic Hg concentrations in the Labrador Sea Water during its eastward journey suggests a continuous decrease in Hg content in this water mass over the last decades. Calculation of the water transport driven by the Atlantic Meridional Overturning Circulation across the Portugal–Greenland transect indicates northward Hg transport within the upper limb and southward Hg transport ... |
format |
Article in Journal/Newspaper |
author |
Cossa, Daniel Heimbürger, Lars-Eric Pérez, Fiz F. García-Ibáñez, Maribel I. Sonke, Jeroen E. Planquette, Hélène Lherminier, Pascale Boutorh, Julia Cheize, Marie Menzel Barraqueta, Jan Lukas Shelley, Rachel Sarthou, Géraldine |
spellingShingle |
Cossa, Daniel Heimbürger, Lars-Eric Pérez, Fiz F. García-Ibáñez, Maribel I. Sonke, Jeroen E. Planquette, Hélène Lherminier, Pascale Boutorh, Julia Cheize, Marie Menzel Barraqueta, Jan Lukas Shelley, Rachel Sarthou, Géraldine Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
author_facet |
Cossa, Daniel Heimbürger, Lars-Eric Pérez, Fiz F. García-Ibáñez, Maribel I. Sonke, Jeroen E. Planquette, Hélène Lherminier, Pascale Boutorh, Julia Cheize, Marie Menzel Barraqueta, Jan Lukas Shelley, Rachel Sarthou, Géraldine |
author_sort |
Cossa, Daniel |
title |
Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
title_short |
Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
title_full |
Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
title_fullStr |
Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
title_full_unstemmed |
Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect |
title_sort |
mercury distribution and transport in the north atlantic ocean along the geotraces-ga01 transect |
publisher |
Copernicus Publications (EGU) |
publishDate |
2018 |
url |
https://oceanrep.geomar.de/id/eprint/42925/ https://oceanrep.geomar.de/id/eprint/42925/1/bg-15-2309-2018.pdf https://oceanrep.geomar.de/id/eprint/42925/2/bg-15-2309-2018-supplement.pdf https://doi.org/10.5194/bg-15-2309-2018 |
geographic |
Canada Greenland |
geographic_facet |
Canada Greenland |
genre |
Greenland Labrador Sea Nordic Seas North Atlantic North East Atlantic |
genre_facet |
Greenland Labrador Sea Nordic Seas North Atlantic North East Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/42925/1/bg-15-2309-2018.pdf https://oceanrep.geomar.de/id/eprint/42925/2/bg-15-2309-2018-supplement.pdf Cossa, D., Heimbürger, L. E., Pérez, F. F., García-Ibáñez, M. I., Sonke, J. E., Planquette, H., Lherminier, P., Boutorh, J., Cheize, M., Menzel Barraqueta, J. L. , Shelley, R. and Sarthou, G. (2018) Mercury distribution and transport in the North Atlantic Ocean along the GEOTRACES-GA01 transect. Open Access Biogeosciences (BG), 15 (8). pp. 2309-2323. DOI 10.5194/bg-15-2309-2018 <https://doi.org/10.5194/bg-15-2309-2018>. doi:10.5194/bg-15-2309-2018 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-15-2309-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
8 |
container_start_page |
2309 |
op_container_end_page |
2323 |
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1766018387104759808 |