Neodymium isotopes trace marine provenance of Arctic sea ice

Radiogenic neodymium (Nd) isotopes (ɛNd) have the potential to serve as a geochemical tracer of the marine origin of Arctic sea ice. This capability results from pronounced ɛNd differences between the distinct marine and riverine sources, which feed the surface waters from which the ice forms. The f...

Full description

Bibliographic Details
Published in:Geochemical Perspectives Letters
Main Authors: Laukert, Georgi, Peeken, I., Bauch, Dorothea, Krumpen, T., Hathorne, Ed C., Werner, K., Gutjahr, Marcus, Frank, Martin
Format: Article in Journal/Newspaper
Language:English
Published: European Association of Geochemistry 2022
Subjects:
Arctic
Arctic Ocean
Fram Strait
Sea ice
Online Access:https://oceanrep.geomar.de/id/eprint/56465/
https://oceanrep.geomar.de/id/eprint/56465/1/Laukert%20et%20al%202022-GPL.pdf
https://oceanrep.geomar.de/id/eprint/56465/2/GPL2220_SIonly.pdf
https://oceanrep.geomar.de/id/eprint/56465/3/GPL2220_TS-1-TS-8.xlsx
https://doi.org/10.7185/geochemlet.2220
Description
Summary:Radiogenic neodymium (Nd) isotopes (ɛNd) have the potential to serve as a geochemical tracer of the marine origin of Arctic sea ice. This capability results from pronounced ɛNd differences between the distinct marine and riverine sources, which feed the surface waters from which the ice forms. The first dissolved Nd isotope and rare earth element (REE) concentration data obtained from Arctic sea ice collected across the Fram Strait during RV Polarstern cruise PS85 in 2014 confirm the incorporation and preservation of the parental surface seawater ɛNd signatures despite efficient REE rejection. The large ɛNd variability between ice floes and within sea ice cores (−32 to −10) reflects changes in water mass distribution during ice growth and drift from the central Arctic Ocean to Fram Strait. In addition to the parental seawater composition, our new approach facilitates the reconstruction of the transfer of matter between the atmosphere, the sea ice and the ocean. In conjunction with satellite-derived drift trajectories, we enable a more accurate assessment of sea ice origin and spatiotemporal evolution, benefiting studies of sea ice biology, biodiversity, and biogeochemistry.

Similar Items