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dc.contributor.authorKopec, Ben G.
dc.contributor.authorKlein, Eric S.
dc.contributor.authorFeldman, Gene C.
dc.contributor.authorPedron, Shawn A.
dc.contributor.authorBailey, Hannah
dc.contributor.authorCausey, Douglas
dc.contributor.authorHubbard, Alun Lloyd
dc.contributor.authorMarttila, Hannu
dc.contributor.authorWelker, Jeffrey M.
dc.date.accessioned2024-08-27T09:25:11Z
dc.date.available2024-08-27T09:25:11Z
dc.date.embargoEndDate2024-12-29
dc.date.issued2024-06-29
dc.description.abstractThe Arctic Ocean and adjacent seas are undergoing increased freshwater influx due to enhanced glacial and sea ice melt, precipitation, and runoff. Accurate delineation of these freshwater sources is vital as they critically modulate ocean composition and circulation with widespread and varied impacts. Despite this, the delineation of freshwater sources using physical oceanographic measurements (e.g., temperature, salinity) alone is challenging and there is a requirement to improve the partitioning of ocean water masses and their mixing relationships. Here, we complement traditional oceanographic measurements with continuous surface seawater isotopic analysis (δ18O and deuterium excess) across a transect extending from coastal Alaska to Baffin Bay and the Labrador Sea conducted from the US Coast Guard Cutter Healy in Autumn 2021. We find that the diverse isotopic signatures of Arctic freshwater sources, coupled with the high freshwater proportion in these marine systems, facilitates detailed fingerprinting and partitioning. We observe the highest freshwater composition in the Beaufort Sea and Amundsen Gulf regions, with heightened freshwater content in eastern Baffin Bay adjacent to West Greenland. We apply isotopic analysis to delineate freshwater sources, revealing that in the Western Arctic freshwater inputs are dominated by meteoric water inputs—specifically the Mackenzie River—with a smaller sea ice meltwater component and in Baffin Bay the primary sources are local precipitation and glacial meltwater discharge. We demonstrate that such freshwater partitioning cannot be achieved using temperature-salinity relationships alone, and highlight the potential of seawater isotopic tracers to assess the roles and importance of these evolving freshwater sourcesen_US
dc.identifier.citationKopec BG, Klein ES, Feldman, Pedron S, Bailey HL, Causey D, Hubbard AL, Marttila H, Welker JM. Arctic Freshwater Sources and Ocean Mixing Relationships Revealed With Seawater Isotopic Tracing. Journal of Geophysical Research (JGR): Oceans. 2024;128en_US
dc.identifier.cristinIDFRIDAID 2281712
dc.identifier.doi10.1029/2023JC020583
dc.identifier.issn2169-9275
dc.identifier.issn2169-9291
dc.identifier.urihttps://hdl.handle.net/10037/34432
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.journalJournal of Geophysical Research (JGR): Oceans
dc.relation.projectIDNational Science Foundation: 2133156en_US
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDNorges forskningsråd: 332635en_US
dc.rights.accessRightsembargoedAccessen_US
dc.rights.holder© 2024. American Geophysical Union. All Rights Reserved.en_US
dc.titleArctic Freshwater Sources and Ocean Mixing Relationships Revealed With Seawater Isotopic Tracingen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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