Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ

Concentrations of the toxic element lead (Pb) are elevated in seawater due to historical emissions. While anthropogenic atmospheric emissions are the dominant source of dissolved Pb (dPb) to the Atlantic Ocean, evidence is emerging of a natural source associated with subglacial discharge into the oc...

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Autores: Krisch, Stephan, Huhn, Oliver, Al-Hashem, Ali, Hopwood, Mark J., Lodeiro, Pablo, Achterberg, Eric P.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Recursos:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:10459.1/84452
Acesso em linha:https://doi.org/10.1029/2022GL100296
http://hdl.handle.net/10459.1/84452
Access Level:acceso abierto
Palavra-chave:Arctic
GEOTRACES
Greenland ice sheet
Lead fluxes
Marine-terminating glacier
Nioghalvfjerdsbrae
Glaceres
Plom
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spelling Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at NioghalvfjerdsbræKrisch, StephanHuhn, OliverAl-Hashem, AliHopwood, Mark J.Lodeiro, PabloAchterberg, Eric P.ArcticGEOTRACESGreenland ice sheetLead fluxesMarine-terminating glacierNioghalvfjerdsbraeGlaceresPlomConcentrations of the toxic element lead (Pb) are elevated in seawater due to historical emissions. While anthropogenic atmospheric emissions are the dominant source of dissolved Pb (dPb) to the Atlantic Ocean, evidence is emerging of a natural source associated with subglacial discharge into the ocean but this has yet to be constrained around Greenland. Here, we show subglacial discharge from the cavity underneath Nioghalvfjerdsbræ floating ice tongue, is a previously unrecognized source of dPb to the NE Greenland Shelf. Contrasting cavity-inflowing and cavity-outflowing waters, we constrain the associated net-dPb flux as 2.2 ± 1.4 Mg·yr−1, of which ∼90% originates from dissolution of glacial bedrock and cavity sediments. We propose that the retreat of the floating ice tongue, the ongoing retreat of many glaciers on Greenland, associated shifts in sediment dynamics, and enhanced meltwater discharges into shelf waters may result in pronounced changes, possibly increases, in net-dPb fluxes to coastal waters.The authors thank the captain and crew of the RV Polarstern GN05 cruise, operated by the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI). The authors also like to thank Michiel Rutgers van der Loeff (AWI) for his advice upon sampling and ship time management, Takamasa Tsubouchi (University of Bergen, Norway) for the CTD control and Martin Graeve and Kai‐Uwe Ludwichowski (both AWI) who performed the macronutrient analyses. The authors are grateful for the help received from Janin Schaffer (AWI), Florian Evers (GEOMAR), Eike Köhn (GEOMAR), Nat Wilson (Woods Hole Oceanographic Institution), and Gerd Rohardt (AWI) for CTD handling and processing, to Nicola Herzberg, Jaw Chuen Yong for assistance during sampling, and to Tim Steffens (all GEOMAR) for technical assistance during HR‐ICP‐MS analyses. Manuel Colombo (WHOI) is thanked for detailed feedback on this manuscript. Stephan Krisch was financed by GEOMAR and the German Research Foundation (DFG award number ...John Wiley and Sons Inc.202220222022info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttps://doi.org/10.1029/2022GL100296http://hdl.handle.net/10459.1/84452http://hdl.handle.net/10459.1/84452reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a https://doi.org/10.1029/2022GL100296Geophysical Research Letters, 2022, vol. 49, núm. 21, p. 1-13cc-by-nc (c) Krisch et al., 2022info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/4.0/oai:recercat.cat:10459.1/844522026-05-29T05:05:01Z
dc.title.none.fl_str_mv Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
title Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
spellingShingle Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
Krisch, Stephan
Arctic
GEOTRACES
Greenland ice sheet
Lead fluxes
Marine-terminating glacier
Nioghalvfjerdsbrae
Glaceres
Plom
title_short Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
title_full Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
title_fullStr Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
title_full_unstemmed Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
title_sort Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ
dc.creator.none.fl_str_mv Krisch, Stephan
Huhn, Oliver
Al-Hashem, Ali
Hopwood, Mark J.
Lodeiro, Pablo
Achterberg, Eric P.
author Krisch, Stephan
author_facet Krisch, Stephan
Huhn, Oliver
Al-Hashem, Ali
Hopwood, Mark J.
Lodeiro, Pablo
Achterberg, Eric P.
author_role author
author2 Huhn, Oliver
Al-Hashem, Ali
Hopwood, Mark J.
Lodeiro, Pablo
Achterberg, Eric P.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Arctic
GEOTRACES
Greenland ice sheet
Lead fluxes
Marine-terminating glacier
Nioghalvfjerdsbrae
Glaceres
Plom
topic Arctic
GEOTRACES
Greenland ice sheet
Lead fluxes
Marine-terminating glacier
Nioghalvfjerdsbrae
Glaceres
Plom
description Concentrations of the toxic element lead (Pb) are elevated in seawater due to historical emissions. While anthropogenic atmospheric emissions are the dominant source of dissolved Pb (dPb) to the Atlantic Ocean, evidence is emerging of a natural source associated with subglacial discharge into the ocean but this has yet to be constrained around Greenland. Here, we show subglacial discharge from the cavity underneath Nioghalvfjerdsbræ floating ice tongue, is a previously unrecognized source of dPb to the NE Greenland Shelf. Contrasting cavity-inflowing and cavity-outflowing waters, we constrain the associated net-dPb flux as 2.2 ± 1.4 Mg·yr−1, of which ∼90% originates from dissolution of glacial bedrock and cavity sediments. We propose that the retreat of the floating ice tongue, the ongoing retreat of many glaciers on Greenland, associated shifts in sediment dynamics, and enhanced meltwater discharges into shelf waters may result in pronounced changes, possibly increases, in net-dPb fluxes to coastal waters.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://doi.org/10.1029/2022GL100296
http://hdl.handle.net/10459.1/84452
http://hdl.handle.net/10459.1/84452
url https://doi.org/10.1029/2022GL100296
http://hdl.handle.net/10459.1/84452
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a https://doi.org/10.1029/2022GL100296
Geophysical Research Letters, 2022, vol. 49, núm. 21, p. 1-13
dc.rights.none.fl_str_mv cc-by-nc (c) Krisch et al., 2022
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc/4.0/
rights_invalid_str_mv cc-by-nc (c) Krisch et al., 2022
http://creativecommons.org/licenses/by-nc/4.0/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv John Wiley and Sons Inc.
publisher.none.fl_str_mv John Wiley and Sons Inc.
dc.source.none.fl_str_mv reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.812455

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