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

Stephan Krisch1,2; Oliver Huhn3; Ali Al-Hashem1; Mark J. Hopwood1,4; Pablo Lodeiro1,5; Eric P. Achterberg1

2022-11-16

10.1029/2022GL100296

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

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 Nioghalvfjerdsbr AE 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 center dot yr(-1), of which similar to 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.

Greenland ice sheet Arctic marine-terminating glacier Nioghalvfjerdsbrae lead fluxes GEOTRACES

SCI

English

NI Journal Papers

Others

Geology

Geosciences, Multidisciplinary

WOS:000889473800001

AMER GEOPHYSICAL UNION

GEOSCIENCES

人工提交

1.GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
2.Now at Federal Institute of Hydrology, Koblenz, Germany
3.Institute of Environmental Physics, University of Bremen, Bremen, Germany
4.Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen, China,
5.Department of Chemistry, University of Lleida–AGROTECNIO-CERCA Center, Lleida, Spain

Stephan Krisch,Oliver Huhn,Ali Al-Hashem,et al. Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(21).

Stephan Krisch,Oliver Huhn,Ali Al-Hashem,Mark J. Hopwood,Pablo Lodeiro,&Eric P. Achterberg.(2022).Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ.GEOPHYSICAL RESEARCH LETTERS,49(21).

Stephan Krisch,et al."Quantifying Ice-Sheet Derived Lead (Pb) Fluxes to the Ocean; A Case Study at Nioghalvfjerdsbræ".GEOPHYSICAL RESEARCH LETTERS 49.21(2022).