Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords
Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to the ocean. These plumes contain elevated concentrations of a range of trace metals, especially in particle bound phases, but it is not clear how these particles...
Published in: | Frontiers in Earth Science |
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ftsanjosestate:oai:scholarworks.sjsu.edu:faculty_rsca-3396 2023-07-30T03:55:56+02:00 Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords Krause, Jana Hopwood, Mark J. Höfer, Juan Krisch, Stephan Achterberg, Eric P. Alarcón, Emilio Carroll, Dustin González, Humberto E. Juul-Pedersen, Thomas Liu, Te Lodeiro, Pablo Meire, Lorenz Rosing, Minik T. 2021-09-27T07:00:00Z application/pdf https://scholarworks.sjsu.edu/faculty_rsca/2397 https://doi.org/10.3389/feart.2021.725279 https://scholarworks.sjsu.edu/context/faculty_rsca/article/3396/viewcontent/feart_09_725279.pdf unknown SJSU ScholarWorks https://scholarworks.sjsu.edu/faculty_rsca/2397 doi:10.3389/feart.2021.725279 https://scholarworks.sjsu.edu/context/faculty_rsca/article/3396/viewcontent/feart_09_725279.pdf http://creativecommons.org/licenses/by/4.0/ Faculty Research, Scholarly, and Creative Activity Antarctic Arctic cobalt copper fjord glacier iron nickel Moss Landing Marine Laboratories Research Foundation text 2021 ftsanjosestate https://doi.org/10.3389/feart.2021.725279 2023-07-17T19:09:29Z Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to the ocean. These plumes contain elevated concentrations of a range of trace metals, especially in particle bound phases, but it is not clear how these particles affect dissolved (<0.2 µm) metal distributions in the ocean. Here we show, using transects in 8 glacier fjords, trends in the distribution of dissolved iron, cobalt, nickel and copper (dFe, dCo, dNi, dCu). Following rapid dFe loss close to glacier outflows, dFe concentrations in particular showed strong similarities between different fjords. Similar dFe concentrations were also observed between seasons/years when Nuup Kangerlua (SW Greenland) was revisited in spring, mid- and late-summer. Dissolved Cu, dCo and dNi concentrations were more variable and showed different gradients with salinity depending on the fjord, season and year. The lack of consistent trends for dCu and dNi largely reflects less pronounced differences contrasting the concentration of inflowing shelf waters with fresher glacially-modified waters. Particles also made only small contributions to total dissolvable Cu (dCu constituted 83 ± 28% of total dissolvable Cu) and Ni (dNi constituted 86 ± 28% of total dissolvable Ni) within glacier plumes. For comparison, dFe was a lower fraction of total dissolvable Fe; 3.5 ± 4.8%. High concentrations of total dissolvable Fe in some inner-fjord environments, up to 77 µM in Ameralik (SW Greenland), may drive enhanced removal of scavenged type elements, such as Co. Further variability may have been driven by local bedrock mineralogy, which could explain high concentrations of dNi (25–29 nM) and dCo (6–7 nM) in one coastal region of west Greenland (Kangaatsiaq). Our results suggest that dissolved trace element distributions in glacier fjords are influenced by a range of factors including: freshwater concentrations, local geology, drawdown by scavenging and primary production, saline inflow, and sediment ... Text Ameralik Antarc* Antarctic Arctic glacier Greenland greenlandic Kangaatsiaq San José State University: SJSU ScholarWorks Arctic Antarctic Greenland Ameralik ENVELOPE(-51.000,-51.000,64.117,64.117) Kangaatsiaq ENVELOPE(-53.464,-53.464,68.306,68.306) Frontiers in Earth Science 9 |
institution |
Open Polar |
collection |
San José State University: SJSU ScholarWorks |
op_collection_id |
ftsanjosestate |
language |
unknown |
topic |
Antarctic Arctic cobalt copper fjord glacier iron nickel Moss Landing Marine Laboratories Research Foundation |
spellingShingle |
Antarctic Arctic cobalt copper fjord glacier iron nickel Moss Landing Marine Laboratories Research Foundation Krause, Jana Hopwood, Mark J. Höfer, Juan Krisch, Stephan Achterberg, Eric P. Alarcón, Emilio Carroll, Dustin González, Humberto E. Juul-Pedersen, Thomas Liu, Te Lodeiro, Pablo Meire, Lorenz Rosing, Minik T. Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
topic_facet |
Antarctic Arctic cobalt copper fjord glacier iron nickel Moss Landing Marine Laboratories Research Foundation |
description |
Around the Greenlandic and Antarctic coastlines, sediment plumes associated with glaciers are significant sources of lithogenic material to the ocean. These plumes contain elevated concentrations of a range of trace metals, especially in particle bound phases, but it is not clear how these particles affect dissolved (<0.2 µm) metal distributions in the ocean. Here we show, using transects in 8 glacier fjords, trends in the distribution of dissolved iron, cobalt, nickel and copper (dFe, dCo, dNi, dCu). Following rapid dFe loss close to glacier outflows, dFe concentrations in particular showed strong similarities between different fjords. Similar dFe concentrations were also observed between seasons/years when Nuup Kangerlua (SW Greenland) was revisited in spring, mid- and late-summer. Dissolved Cu, dCo and dNi concentrations were more variable and showed different gradients with salinity depending on the fjord, season and year. The lack of consistent trends for dCu and dNi largely reflects less pronounced differences contrasting the concentration of inflowing shelf waters with fresher glacially-modified waters. Particles also made only small contributions to total dissolvable Cu (dCu constituted 83 ± 28% of total dissolvable Cu) and Ni (dNi constituted 86 ± 28% of total dissolvable Ni) within glacier plumes. For comparison, dFe was a lower fraction of total dissolvable Fe; 3.5 ± 4.8%. High concentrations of total dissolvable Fe in some inner-fjord environments, up to 77 µM in Ameralik (SW Greenland), may drive enhanced removal of scavenged type elements, such as Co. Further variability may have been driven by local bedrock mineralogy, which could explain high concentrations of dNi (25–29 nM) and dCo (6–7 nM) in one coastal region of west Greenland (Kangaatsiaq). Our results suggest that dissolved trace element distributions in glacier fjords are influenced by a range of factors including: freshwater concentrations, local geology, drawdown by scavenging and primary production, saline inflow, and sediment ... |
format |
Text |
author |
Krause, Jana Hopwood, Mark J. Höfer, Juan Krisch, Stephan Achterberg, Eric P. Alarcón, Emilio Carroll, Dustin González, Humberto E. Juul-Pedersen, Thomas Liu, Te Lodeiro, Pablo Meire, Lorenz Rosing, Minik T. |
author_facet |
Krause, Jana Hopwood, Mark J. Höfer, Juan Krisch, Stephan Achterberg, Eric P. Alarcón, Emilio Carroll, Dustin González, Humberto E. Juul-Pedersen, Thomas Liu, Te Lodeiro, Pablo Meire, Lorenz Rosing, Minik T. |
author_sort |
Krause, Jana |
title |
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
title_short |
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
title_full |
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
title_fullStr |
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
title_full_unstemmed |
Trace Element (Fe, Co, Ni and Cu) Dynamics Across the Salinity Gradient in Arctic and Antarctic Glacier Fjords |
title_sort |
trace element (fe, co, ni and cu) dynamics across the salinity gradient in arctic and antarctic glacier fjords |
publisher |
SJSU ScholarWorks |
publishDate |
2021 |
url |
https://scholarworks.sjsu.edu/faculty_rsca/2397 https://doi.org/10.3389/feart.2021.725279 https://scholarworks.sjsu.edu/context/faculty_rsca/article/3396/viewcontent/feart_09_725279.pdf |
long_lat |
ENVELOPE(-51.000,-51.000,64.117,64.117) ENVELOPE(-53.464,-53.464,68.306,68.306) |
geographic |
Arctic Antarctic Greenland Ameralik Kangaatsiaq |
geographic_facet |
Arctic Antarctic Greenland Ameralik Kangaatsiaq |
genre |
Ameralik Antarc* Antarctic Arctic glacier Greenland greenlandic Kangaatsiaq |
genre_facet |
Ameralik Antarc* Antarctic Arctic glacier Greenland greenlandic Kangaatsiaq |
op_source |
Faculty Research, Scholarly, and Creative Activity |
op_relation |
https://scholarworks.sjsu.edu/faculty_rsca/2397 doi:10.3389/feart.2021.725279 https://scholarworks.sjsu.edu/context/faculty_rsca/article/3396/viewcontent/feart_09_725279.pdf |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2021.725279 |
container_title |
Frontiers in Earth Science |
container_volume |
9 |
_version_ |
1772810318949384192 |