Mapping of permafrost surface using ground-penetrating radar at Kangerlussuaq Airport, western Greenland

Jørgensen, Anders Stuhr; Andreasen, Frank

doi:10.1016/j.coldregions.2006.10.007

Cited by 45 publications

(29 citation statements)

References 5 publications

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“…2). The region has continuous permafrost extending from 50 cm below the surface to 130 m at Kangerlussuaq and 500 m at the ice sheet (Jorgensen and Andreasen, 2007). Soils in the region are not well developed, composed of till and glaciofluvial deposits (Van Tatenhove and Olesen, 1994).…”

Section: Study Areamentioning

confidence: 99%

“…On the ice-free margin of southwestern Greenland, hundreds of thousands of Holocene lakes perched on continuous permafrost cover the landscape (Anderson et al, 2001;Anderson and Stedmon, 2007;Jorgensen and Andreasen, 2007). As a result of amplified warming in the Arctic over the past 20 years (IPCC, 2013), Greenland has experienced significant mass loss of the Greenland Ice Sheet (GIS; Nghiem et al, 2012;van As et al, 2012;Hall et al, 2013;Hanna et al, 2013Hanna et al, , 2014.…”

Section: Introductionmentioning

confidence: 99%

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Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

2017

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Abstract. In thermally stratified lakes, the greatest annual methane emissions typically occur during thermal overturn events. In July of 2012, Greenland experienced significant warming that resulted in substantial melting of the Greenland Ice Sheet and enhanced runoff events. This unusual climate phenomenon provided an opportunity to examine the effects of short-term natural heating on lake thermal structure and methane dynamics and compare these observations with those from the following year, when temperatures were normal. Here, we focus on methane concentrations within the water column of five adjacent small lakes on the icefree margin of southwestern Greenland under open-water and ice-covered conditions from 2012-2014. Enhanced warming of the epilimnion in the lakes under open-water conditions in 2012 led to strong thermal stability and the development of anoxic hypolimnia in each of the lakes. As a result, during open-water conditions, mean dissolved methane concentrations in the water column were significantly (p < 0.0001) greater in 2012 than in 2013. In all of the lakes, mean methane concentrations under ice-covered conditions were significantly (p < 0.0001) greater than under open-water conditions, suggesting spring overturn is currently the largest annual methane flux to the atmosphere. As the climate continues to warm, shorter ice cover durations are expected, which may reduce the winter inventory of methane and lead to a decrease in total methane flux during ice melt. Under openwater conditions, greater heat income and warming of lake surface waters will lead to increased thermal stratification and hypolimnetic anoxia, which will consequently result in increased water column inventories of methane. This stored methane will be susceptible to emissions during fall overturn, which may result in a shift in greatest annual efflux of methane from spring melt to fall overturn. The results of this study suggest that interannual variation in ground-level air temperatures may be the primary driver of changes in methane dynamics because it controls both the duration of ice cover and the strength of thermal stratification.

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Section: Study Areamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

2017

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“…This is similarly supported by the high d value described above. Kangerlussuaq is within the region of continuous permafrost (Jørgensen and Andreasen, 2007), although local permafrost distribution is dependent on topography (Henkner et al, 2016). Glacial runoff also contributes water to the landscape and has a more negative isotope value than local meteoric waters.…”

Section: Precipitation Estimatementioning

confidence: 99%

Plant Water δD and δ¹⁸O of Tundra Species from West Greenland

Bush

Berke

Jacobson

2017

Arctic, Antarctic, and Alpine Research

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“…Supplementary to the ERT data, Ground Penetrating Radar (GPR) profiles were collected in order to provide independent geophysical constraints on the depth to the permafrost layer (Jørgensen and Andreasen, 2007;Gacitúa et al, 2012).…”

Section: Geophysical Imagingmentioning

confidence: 99%

Water flow in the active layer along an arctic slope – An investigation based on a field campaign and model simulations

Zastruzny

Elberling

Nielsen

et al. 2017

Preprint

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Abstract. As climate conditions change, the hydrological regime in the active layer is subject to change too. This influences the transport of solutes and the availability of nutrients, e.g. nitrogen particularly, along slopes. There is a lack of understanding the pathways and travel times of water and nutrients along slopes in discontinuous permafrost regions and 10 how to scale changes along transects to the rest of the landscape. This study presents a comprehensive data set of a field site in Disko Island in Greenland aiming at constructing a hydrological model of the area. Data from automated weather stations, geophysical surveys, soil samples and soil sensors and tracer experiments are combined to describe the spatial variability in the field and to serve as input to a two-dimensional model (SUTRA) for simulating water and solute transport in the summer period. The model is calibrated and validated against volumetric water content and breakthrough curves of the applied 15 tracers. Observed and simulated results suggest that the flow velocity in the active layer is directly influenced by annual precipitation patterns leading to water flow during the summer and rapid movement at the end of summer. Yearly travel times for the specific field site are simulated to be approximately 14 m/a and the highest peak velocities are most likely caused by preferential flow paths. The spatial heterogeneities linked to the frost topography seem to control the direction and velocity of flow. The observed discontinuous movement of a conservative tracer suggests that the movement of dissolved 20 nitrogen compounds such as nitrate, being released along the slope in consequence of permafrost thawing, could possibly quickly influence nitrogen cycling at the end of the slope. This may trigger a feedback of climate changes in terms of increasing carbon sequestration due to additional plant growth in these otherwise nitrogen-limited Arctic ecosystems. 25The Cryosphere Discuss., https://doi

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Mapping of permafrost surface using ground-penetrating radar at Kangerlussuaq Airport, western Greenland

Cited by 45 publications

References 5 publications

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Plant Water δD and δ¹⁸O of Tundra Species from West Greenland

Water flow in the active layer along an arctic slope – An investigation based on a field campaign and model simulations

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Mapping of permafrost surface using ground-penetrating radar at Kangerlussuaq Airport, western Greenland

Cited by 45 publications

References 5 publications

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Plant Water δD and δ18O of Tundra Species from West Greenland

Water flow in the active layer along an arctic slope – An investigation based on a field campaign and model simulations

Contact Info

Product

Resources

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Plant Water δD and δ¹⁸O of Tundra Species from West Greenland