Methane emission dynamics among CO2-absorbing and thermokarst lakes of a great Arctic delta

Cunada, Christopher Luke; Lesack, Lance F. W.; Tank, Suzanne E.

doi:10.1007/s10533-021-00853-0

Cited by 9 publications

(13 citation statements)

References 72 publications

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“…For instance, large amounts of CH 4 are produced in sediments and transferred to lake waters, and a large share of the lake CH 4 is consumed via oxidation in the water column 8 – 10 . Nevertheless, CH 4 production 21 – 24 and oxidation rates 9 , 21 – 23 , 25 in lakes across the Arctic are comparable in magnitude to groundwater CH 4 inputs found in this study (Fig. 4 ), which emphasizes the relevance of groundwater discharge as an important mechanism controlling lake CH 4 budgets.…”

Section: Resultssupporting

confidence: 81%

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Groundwater discharge as a driver of methane emissions from Arctic lakes

et al. 2022

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Lateral CH4 inputs to Arctic lakes through groundwater discharge could be substantial and constitute an important pathway that links CH4 production in thawing permafrost to atmospheric emissions via lakes. Yet, groundwater CH4 inputs and associated drivers are hitherto poorly constrained because their dynamics and spatial variability are largely unknown. Here, we unravel the important role and drivers of groundwater discharge for CH4 emissions from Arctic lakes. Spatial patterns across lakes suggest groundwater inflows are primarily related to lake depth and wetland cover. Groundwater CH4 inputs to lakes are higher in summer than in autumn and are influenced by hydrological (groundwater recharge) and biological drivers (CH4 production). This information on the spatial and temporal patterns on groundwater discharge at high northern latitudes is critical for predicting lake CH4 emissions in the warming Arctic, as rising temperatures, increasing precipitation, and permafrost thawing may further exacerbate groundwater CH4 inputs to lakes.

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Section: Resultssupporting

confidence: 81%

“…Sampling and analyses. The first survey in 2018 included three lakes (BD04, BD13, BD15) sampled in June (21)(22)(23)(24)(25) and September (8)(9)(10)(11)(12). In July (27)(28) 2018, a short sampling campaign was conducted to collect groundwater samples from the active layer.…”

Section: Groundwater Inputsmentioning

confidence: 99%

Groundwater discharge as a driver of methane emissions from Arctic lakes

et al. 2022

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“…For instance, large amounts of CH 4 are produced in sediments and transferred to lake waters, and a large share of the lake CH 4 is consumed via oxidation in the water column [8][9][10] . Nevertheless, CH 4 production [21][22][23][24] and oxidation rates 9,[21][22][23]25 in lakes across the Arctic are comparable in magnitude to groundwater CH 4 inputs found in this study (Fig. 4), which emphasizes the relevance of groundwater discharge as an important mechanism controlling lake CH 4 budgets.…”

Section: Resultssupporting

confidence: 81%

Groundwater discharge as a driver of methane emissions from Arctic lakes

Olid

Rodellas

Rocher-Ros

et al. 2022

Preprint

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Methane (CH4) emissions from Arctic lakes are significant and highly sensitive to global warming. Groundwater inputs to lakes could be substantial and constitute a link between CH4 from melting permafrost to emissions via lakes. Yet, groundwater CH4 inputs and associated drivers are hitherto poorly understood. In this study, we disclose temporal and spatial patterns of groundwater CH4 inputs to Arctic lakes in the discontinuous permafrost zone in northern Sweden. Results show that groundwater discharge is a major source of CH4 to the lakes. Spatial patterns across lakes suggest that groundwater inflow rates are primarily related to lake morphology and land cover. Groundwater CH4 inputs and atmospheric CH4 emissions from lakes were higher in summer than in autumn, reflecting changes in hydrological and biological drivers. This study reveals the large role and the drivers of groundwater discharge in lake CH4 cycling, which may be further exacerbated with the ongoing climate change, as rising temperatures, increasing precipitation, and permafrost thawing are likely to increase groundwater CH4 inputs to lakes.

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“…Irrespective of whether lake coverage is expanding or decreasing, the reorganization of thermokarst lake cover will have significant implications for polar atmospheric carbon fluxes (Engram et al., 2020; Grosse et al., 2013; Petrescu et al., 2010; Rowland et al., 2010; van Huissteden et al., 2011; Walter Anthony et al., 2018). Moreover, thermokarst lakes in deltas modulate the transport of riverine freshwater, sediment, and nutrient fluxes to the Arctic ocean, by trapping and holding sediment (Marsh et al., 1999; Piliouras & Rowland, 2020) and modifying the residence times and pathways of nutrient transport through the delta (Cunada et al., 2021; Emmerton et al., 2007; Lesack & Marsh, 2010; Squires et al., 2009; Tank et al., 2009). Therefore, changing deltaic lake coverage and its spatial distribution will also alter the timing and magnitudes of riverine fluxes to the Arctic Ocean, which has broader implications for near‐shore circulation and ecosystem productivity (Lique et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Climate Signatures on Lake And Wetland Size Distributions in Arctic Deltas

Vulis

Tejedor

Zaliapin

et al. 2021

Geophysical Research Letters

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Coastal river deltas are landscapes at significant risk from sea level rise and sediment deprivation (Nienhuis et al., 2020;Syvitski et al., 2009). Arctic deltas are likely more vulnerable than their temperate counterparts due to the presence of thermokarst lakes in permafrost, which are sensitive to rapid Arctic warming (Emmerton et al., 2007;Walker, 1998). Pan-arctic thermokarst lake coverage is responding to warmer temperatures in complex ways, as temperature-driven ground ice loss drives lake growth through retrogressive thaw slumping along lake shorelines (Grosse et al., 2013) but also generates surface and subsurface hydrologic connectivity that can cause lake drainage (

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Methane emission dynamics among CO2-absorbing and thermokarst lakes of a great Arctic delta

Cited by 9 publications

References 72 publications

Groundwater discharge as a driver of methane emissions from Arctic lakes

Groundwater discharge as a driver of methane emissions from Arctic lakes

Groundwater discharge as a driver of methane emissions from Arctic lakes

Climate Signatures on Lake And Wetland Size Distributions in Arctic Deltas

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