Solid-phase Mn speciation in suspended particles along meltwater-influenced fjords of West Greenland

Genuchten, Case M. van; Hopwood, Mark J.; Liu, T.; Krause, Jana; Achterberg, Eric P.; Rosing, Minik T.; Meire, Lorenz

doi:10.1016/j.gca.2022.04.003

Cited by 6 publications

(14 citation statements)

References 95 publications

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“…The dMn content for these categories falls within the lower end of the range of concentrations observed in the Kolyma, Severnaya Dvina, Ob, Lena, and Yenisey, and is comparable to those observed in the Mackenzie River (Holmes et al, 2013;McClelland et al, 2008;Pokrovsky et al, 2010;Hölemann et al, 2005). Our glacial dMn endmember concentration is on the upper end of the range of concentrations observed in runoff around Greenland (Hawkings et al, 2020;Van Genuchten et al, 2022).…”

Section: Methodssupporting

confidence: 78%

Continental and glacial runoff fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat ocean

Rogalla

Allen

Colombo

et al. 2023

Preprint

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Rising temperatures and an acceleration of the hydrological cycle due to climate change are increasing river discharge, causing permafrost thaw, glacial melt, and a shift to a groundwater-dominated system in the Arctic. These changes are funnelled to coastal regions of the Arctic Ocean where the implications for the distributions of nutrients and biogeochemical constituents are unclear. In this study, we investigate the impact of terrestrial runoff on marine biogeochemistry in Inuit Nunangat (the Canadian Arctic Archipelago) — a key pathway for transport and modification of waters from the Arctic Ocean to the North Atlantic — using sensitivity experiments from 2002-2020 with an ocean model of manganese (Mn). The micronutrient Mn traces terrestrial runoff and the modification of geochemical constituents of runoff during transit. The heterogeneity in Arctic runoff composition creates distinct terrestrial fingerprints of influence in the ocean: continental runoff influences Mn in the southwestern Archipelago, glacial runoff dominates the northeast, and their influence co-occurs in central Parry Channel. Glacial runoff carries micronutrients southward from Nares Strait in the late summer and may help support longer phytoplankton blooms in the Pikialasorsuaq polynya. Enhanced glacial runoff may increase micronutrients delivered downstream to Baffin Bay, accounting for up to 18% of dissolved Mn fluxes seasonally and 6% annually. These findings highlight how climate induced changes to terrestrial runoff may impact the geochemical composition of the marine environment, and will help to predict the extent of these impacts from ongoing alterations of the Arctic hydrological cycle.

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Section: Methodssupporting

confidence: 78%

Continental and glacial runoff fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat ocean

Rogalla

Allen

Colombo

et al. 2023

Preprint

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show abstract

“…The dMn content for these categories falls within the lower end of the range of concentrations observed in the Kolyma, Severnaya Dvina, Ob, Lena, and Yenisey, and is comparable to those observed in the Mackenzie River (Hölemann et al, 2005;Holmes et al, 2013;McClelland et al, 2008;Pokrovsky et al, 2010). Our glacial dMn endmember concentration is on the upper end of the range of concentrations observed in runoff around Greenland (Hawkings et al, 2020;Van Genuchten et al, 2022).…”

Section: Methodssupporting

confidence: 75%

Continental and Glacial Runoff Fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat Ocean

et al. 2023

View full text Add to dashboard Cite

Rising temperatures and an acceleration of the hydrological cycle due to climate change are increasing river discharge, causing permafrost thaw, glacial melt, and a shift to a groundwater‐dominated system in the Arctic. These changes are funneled to coastal regions of the Arctic Ocean where the implications for the distributions of nutrients and biogeochemical constituents are unclear. In this study, we investigate the impact of terrestrial runoff on marine biogeochemistry in Inuit Nunangat (the Canadian Arctic Archipelago)—a key pathway for transport and modification of waters from the Arctic Ocean to the North Atlantic—using sensitivity experiments from 2002 to 2020 with an ocean model of manganese (Mn). The micronutrient Mn traces terrestrial runoff and the modification of geochemical constituents of runoff during transit. The heterogeneity in Arctic runoff composition creates distinct terrestrial fingerprints of influence in the ocean: continental runoff influences Mn in the southwestern Archipelago, glacial runoff dominates the northeast, and their influence co‐occurs in central Parry Channel. Glacial runoff carries micronutrients southward from Nares Strait in the late summer and may help support longer phytoplankton blooms in the Pikialasorsuaq polynya. Enhanced glacial runoff may increase micronutrients delivered downstream to Baffin Bay, accounting for up to 18% of dissolved Mn fluxes seasonally and 6% annually. These findings highlight how climate induced changes to terrestrial runoff may impact the geochemical composition of the marine environment, and will help to predict the extent of these impacts from ongoing alterations of the Arctic hydrological cycle.

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“…As per extrapolations using salinity, these regressions produce apparent concentrations inclusive of non-conservative processes affecting the concentration of dTMs during the timeframe since the release of submarine meltwater. These concentrations are 1-3 orders of magnitude higher than that in the Fram Strait and EGC in Southeast Greenland (Achterberg et al, 2021), but similar to endmember values derived from summer coastal/fjord data around south/west Greenland (Krause et al, 2021;van Genuchten et al, 2022), demonstrating the 79NG submarine meltwater is a strong local source of these dTMs. For instance, the dCo content of the meltwater is more than 60 times higher than that of AIW.…”

Section: The 79ng Cavity Contribution To Dtm Supply Derived From Heli...supporting

confidence: 74%

“…Based on the estimated meltwater contributions (Figure S7 in Supporting Information S1) and the apparent endmember dTM concentrations of the submarine meltwater, about 10%-25% dCo in center WT and 5%-20% dCo in EGC center on the outer NE Greenland Shelf were supplied by the submarine meltwater from the 79NG cavity. Up to 60% dMn in Dijmphna Sund and Inner WT was sourced from the 79NG cavity ascribed to the high apparent dMn concentrations in the meltwater endmember (which is similar to observations in other glaciated Arctic regions) (Kandel & Aguilar-Islas, 2021;van Genuchten et al, 2022).…”

Section: The 79ng Influence On Dtms and Ptms Beyond The Glacial Cavitysupporting

confidence: 71%

Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf

Chen

Krisch

Al‐Hashem

et al. 2022

Global Biogeochemical Cycles

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In addition to macronutrients (fixed nitrogen (NO 3 + NO 2 ), phosphate (PO 4 ), and silicic acid), trace metals (TMs) including iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), manganese (Mn), and cadmium (Cd) have attracted research interest due to their roles in marine primary productivity (Morel & Price, 2003;Twining & Baines, 2013). Because the supply of bio-essential TMs is in large parts of the global ocean insufficient to fully meet phytoplankton growth requirements (C. M. Moore et al., 2013), short-term growth of phytoplankton communities is often TM limited or co-limited (e.g.,

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Solid-phase Mn speciation in suspended particles along meltwater-influenced fjords of West Greenland

Cited by 6 publications

References 95 publications

Continental and glacial runoff fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat ocean

Continental and glacial runoff fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat ocean

Continental and Glacial Runoff Fingerprints in the Canadian Arctic Archipelago, the Inuit Nunangat Ocean

Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf

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