2019
DOI: 10.1029/2019gl084237
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Discharge of Meteoric Water in the Eastern Norwegian Sea since the Last Glacial Period

Abstract: 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… Show more

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Cited by 30 publications
(25 citation statements)
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References 79 publications
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“…500 km from the shelf edge, where the maximum extent of glacier ice was during the Last Glacial Maximum (Patton et al, 2016). Similar signs of meteoric water were also observed along the continental shelf of the Norwegian margin (Egeberg and Aagaard, 1989) and more recently documented by Hong et al (2019) from the Lofoten-Vesterålen continental slope (∼ 800 m water depth and ca. 100 km from the Lofoten Archipelago).…”
Section: Groundwater Systems In Breakup Basalts and Carbon Storagesupporting
confidence: 72%
“…500 km from the shelf edge, where the maximum extent of glacier ice was during the Last Glacial Maximum (Patton et al, 2016). Similar signs of meteoric water were also observed along the continental shelf of the Norwegian margin (Egeberg and Aagaard, 1989) and more recently documented by Hong et al (2019) from the Lofoten-Vesterålen continental slope (∼ 800 m water depth and ca. 100 km from the Lofoten Archipelago).…”
Section: Groundwater Systems In Breakup Basalts and Carbon Storagesupporting
confidence: 72%
“…Besides, the presence of zones of decreased salinity and increased temperature of seawater, including the fresh‐water Nordbreigrunnen spring 7 km off the Meløy area (Storrø, 2013) (Figure 1b), strongly supports our hypothesis that precipitation‐induced groundwater flow is present in the region. In addition, discharge of freshwater was recently detected at the continental slope off northern Norway (Hong et al, 2019), possibly indicating modern long‐distance groundwater flow. On the other hand, this discharge of meteoric water at the continental slope can be related to past groundwater circulation as a consequence of glacial‐interglacial dynamics (Hong et al, 2019).…”
Section: Discussionmentioning
confidence: 98%
“…In addition, discharge of freshwater was recently detected at the continental slope off northern Norway (Hong et al, 2019), possibly indicating modern long‐distance groundwater flow. On the other hand, this discharge of meteoric water at the continental slope can be related to past groundwater circulation as a consequence of glacial‐interglacial dynamics (Hong et al, 2019). Unfortunately, there is yet no direct data on underwater fresh‐water springs in the open sea off Western Norway.…”
Section: Discussionmentioning
confidence: 98%
“…No free gas (bubbling of gas from the seafloor) has been observed at this location; however, sediment porewater fluids are enriched in dissolved gases of reduced compounds. Isotope analyses of porewater fluids indicate that dissolved methane is of biogenic origin, although the actual sources are still being investigated (Hong et al, 2019). In addition to methane seepage at the canyons, there is a freshwater discharge from submarine groundwater reservoirs, which is suggested to considerably influence the local circulation and ocean chemistry in the area (Hong et al, 2019).…”
Section: Arctic Seep Sitesmentioning
confidence: 99%
“…Dating of vesicomyid shells suggest that these chemosymbiotic bivalves disappeared from Arctic seeps approximately 15,000 years ago (Ambrose et al, 2015;Hansen et al, 2017Hansen et al, , 2020. Since carbonates with preserved remains of frenulate tubes from Arctic seep sites have been dated to a minimum of 20,000 years old (Hong et al, 2019), the chemosymbiotic megafaunal communities of Arctic seeps in the past likely consisted of large bivalves along with siboglinids.…”
Section: Are Populations Of Hallmark Chemosymbiotic Seep Taxa Absent mentioning
confidence: 99%