Freshwater Seepage Into Sediments of the Shelf, Shelf Edge, and Continental Slope of the Canadian Beaufort Sea

Long‐term warming of the continental shelf of the Canadian Beaufort Sea caused by the transgression associated with the last deglaciation may be causing decomposition of relict offshore subsea permafrost and gas hydrates. To evaluate this possibility, pore waters from 118 sediment cores up to 7.3‐m...

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Veröffentlicht in:	Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2018-09, Vol.19 (9), p.3039-3055
Hauptverfasser:	Gwiazda, R., Paull, C. K., Dallimore, S. R., Melling, H., Jin, Y. K., Hong, J. K., Riedel, M., Lundsten, E., Anderson, K., Conway, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	Continental shelves Continental slope Cores Decomposition Deglaciation Fluvial sediments Freshwater Gas hydrates Geological hazards Glacial periods Groundwater Groundwater discharge Groundwater flow Hydrates Infiltration Inland water environment Isotopes Landslides Low temperature Meltwater Ocean floor Offshore Permafrost Pore water pore waters freshening Precipitation River water Rivers Sea level Sediment Sediments Shelf edge Slopes Soil Soil degradation submarine groundwater discharge submarine permafrost Tsunamis Water depth
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Zusammenfassung:	Long‐term warming of the continental shelf of the Canadian Beaufort Sea caused by the transgression associated with the last deglaciation may be causing decomposition of relict offshore subsea permafrost and gas hydrates. To evaluate this possibility, pore waters from 118 sediment cores up to 7.3‐m long were taken on the shelf and slope and analyzed for chloride concentrations and δ180 and δD composition. We observed downcore decreases in pore waters Cl− concentration in sediments from all sites from the inner shelf (
ISSN:	1525-2027 1525-2027
DOI:	10.1029/2018GC007623