Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 46, Issue 14, Pages 8194-8204Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2019GL084237
Keywords
submarine groundwater discharge; Arctic Ocean; methane emission; authigenic minerals
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Funding
- Research Council of Norway (RCN) through Petromaks2-NORCRUST and its Centre of Excellence funding scheme for CAGE [255150, 223259]
- project Development on Geochemical Proxies of Isotope and Trace Element for Understanding of Earth and Universe Evolution Processes - Korea Ministry of Science and ICT (MSIT) [GP2017-018]
- MSIT [NRF-2015M1A5A1037243, PN19090]
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Submarine groundwater discharge could impact the transport of critical solutes to the ocean. However, its driver(s), significance over geological time scales, and geographical coverage are poorly understood. We characterize a submarine groundwater seep from the continental slope off northern Norway where substantial amount of meteoric water was detected. We reconstruct the seepage history from textural relationships and U-Th geochronology of authigenic minerals. We demonstrate how glacial-interglacial dynamics have promoted submarine groundwater circulation more than 100 km offshore and result in high fluxes of critical solutes to the ocean. Such cryosphere-hydrosphere coupling is likely common in the circum-Arctic implying that future decay of glaciers and permafrost in a warming Arctic is expected to attenuate such a coupled process and thus decreases the export of critical solutes.
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