Trickle and Treat? The Critical Role of Marine‐Terminating Glaciers as Icy Macronutrient Pumps in Polar Regions

Hawkings, Jon R.

doi:10.1029/2021jg006598

Cited by 2 publications

(2 citation statements)

References 87 publications

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“…There has been a recent focus on understanding how fluxes of glacially derived nutrients impact downstream ecosystems, given that meltwaters are enriched in micro‐ and macro‐nutrients (e.g., Hawkings, 2021; Hendry et al., 2019; Martin et al., 2020; Vick‐Majors et al., 2020). However, the role of fjords in the modulation and drawdown of glacially derived nutrients is still poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Silicon Isotopes Highlight the Role of Glaciated Fjords in Modifying Coastal Waters

et al. 2023

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The Arctic is experiencing some of the most rapid environmental changes as a result of global climatic change, with the Greenland Ice Sheet (GrIS) undergoing substantial mass loss. Arctic temperatures are rising at more than double the global average (Forster et al., 2021) and the significant ice mass loss from the GrIS has global implications via the impacts on oceanic circulation and biogeochemical cycles. Fjord environments act as the interface between the GrIS and the global ocean, largely influenced by increasing freshwater fluxes from land and marine terminating glaciers. Greenlandic glacial fjords are highly productive environments especially considering their

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Section: Introductionmentioning

confidence: 99%

Silicon Isotopes Highlight the Role of Glaciated Fjords in Modifying Coastal Waters

et al. 2023

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“…All numbers are in mmol m 2 lagoon area d 1 , originally found in Table2. The model is based on our original data and inspired byHopwood et al (2020) andHawkings (2021).…”

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confidence: 99%

Carbon Outwelling and Uptake Along a Tidal Glacier‐Lagoon‐Ocean Continuum

Ljungberg,

Yau,

Cabral

et al. 2024

JGR Biogeosciences

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Tidewater glaciers are highly vulnerable to climate change due to warming from both atmospheric and seawater sources. Most tidewater glaciers are rapidly retreating, but little is known about how glacial melting modifies coastal biogeochemical cycles. Here, we investigate carbonate and nutrient dynamics and fluxes in an expanding proglacial tidal lagoon connected to Europe's largest glacier in Iceland (Vatnajökull). The lagoon N:P:Si ratios (2:1:30) imply a system deficient in nitrogen. The large variations in the freshwater endmembers highlighted the complexity of resolving sources and transformations. The lagoon acted as a sink of dissolved inorganic carbon (DIC). Floating chamber incubations revealed a CO2 uptake of 26 ± 15 mmol m−2 d−1. Lagoon waters near the glacier had a 170% higher CO2 uptake than near the lagoon mouth, likely driven by primary production stimulated by nitrogen‐rich bottom water upwelling. The lateral DIC and total alkalinity (TA) flux rates (outwelling) from the lagoon to the ocean were −1.5 ± 0.1 (export to ocean) and 23 ± 5 mmol m−2 d−1 (import into the lagoon) respectively. All samples were undersaturated with respect to aragonite due to glacial meltwater dilution of TA and CO2 uptake. This implies dilution of oceanic alkalinity, lowering the nearshore buffering capacity against ocean acidification.

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Trickle and Treat? The Critical Role of Marine‐Terminating Glaciers as Icy Macronutrient Pumps in Polar Regions

Cited by 2 publications

References 87 publications

Silicon Isotopes Highlight the Role of Glaciated Fjords in Modifying Coastal Waters

Silicon Isotopes Highlight the Role of Glaciated Fjords in Modifying Coastal Waters

Carbon Outwelling and Uptake Along a Tidal Glacier‐Lagoon‐Ocean Continuum

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