Data evaluation and numerical modeling of hydrological interactions between active layer, lake and talik in a permafrost catchment, Western Greenland

Johansson, Emma; Gustafsson, Lars-Göran; Berglund, Sten; Lindborg, Tobias; Selroos, Jan-Olof; Liljedahl, Lillemor Claesson; Destouni, Georgia

doi:10.1016/j.jhydrol.2015.05.026

Cited by 53 publications

(47 citation statements)

References 34 publications

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“…The region has a continental climate (Low Arctic to subarctic) due to stable high-pressure cells over the ice sheet, and the predominant wind direction for the area is from east to southeast (Rott and Obleitner, 1992;van den Broeke et al, 1994;van den Broeke and Gallee, 1996). Mean annual temperature for the area is -5.1 °C, ranging from -9.1 to -0.3 °C (1977-2011Cappelen, 2012), and mean annual precipitation is 173 mm yr -1 , of which ~40% falls as snow (data corrected for wind and adhesion losses) (Johansson et al, 2015a(Johansson et al, , 2015b.…”

Section: Regional Settingmentioning

confidence: 99%

“…This is most evident in the two river valleys, Sandflugtdalen and Ørkendalen, but the whole area is covered by a thick loess deposit, which has largely been stabilized by vegetation (Dijkmans and Törnqvist, 1991;Willemse et al, 2003). The eolian activity is considered to be source limited, and to be highest during the winter months when wind strengths generally are higher (Rott and Obleitner, 1992;Johansson et al, 2015aJohansson et al, , 2015b; however, in winters snow might also decrease the availability of erodible material (Bullard and Austin, 2011).…”

Section: Regional Settingmentioning

confidence: 99%

“…Even if the area is dry, the water balance in Two-Boat Lake is positive. Hydrological modeling for the past 37 years shows that there is an outflow from the lake in about 70% of the years, that between-year variation in lake water level is 0.7 m, while within-year variation in lake water level is less than 0.25 cm (Johansson et al, 2015b). The predominant wind direction is from the southeast, and the strongest winds occur during winter (Johansson et al, 2015a).…”

Section: Two-boat Lakementioning

confidence: 99%

“…1) to assess how the potential influence of eolian material on the sediment geochemistry varies depending on distance from the ice sheet. Two-Boat Lake is currently the main focus of an extensive drainage basin-scale ecosystem study (Clarhäll, 2011;Johansson et al, 2015a;Johansson et al, 2015b), and both the geochemical record in general, and the eolian record in particular, will be vital information to place the present-day conditions into a longer time perspective and when creating scenarios for future landscape development (Lindborg et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The Importance of Eolian Input on Lake-Sediment Geochemical Composition in the Dry Proglacial Landscape of Western Greenland

Rydberg

Lindborg

Sohlenius

et al. 2016

Arctic, Antarctic, and Alpine Research

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Section: Regional Settingmentioning

confidence: 99%

Section: Regional Settingmentioning

confidence: 99%

Section: Two-boat Lakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Importance of Eolian Input on Lake-Sediment Geochemical Composition in the Dry Proglacial Landscape of Western Greenland

Rydberg

Lindborg

Sohlenius

et al. 2016

Arctic, Antarctic, and Alpine Research

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“…The meteorological and hydrological data collected by GRASP at TBL are presented in Johansson et al (2015a; doi:10.1594/PANGAEA.836178). Johansson et al (2015b) developed a detailed water balance model of the TBL catchment. From a decadal perspective precipitation barely exceeds evapotranspiration, and the net annual water budget is alternating between positive and negative.…”

Section: Site Descriptionmentioning

confidence: 99%

Biogeochemical data from terrestrial and aquatic ecosystems in a periglacial catchment, West Greenland

Lindborg

Rydberg

Tröjbom

et al. 2016

Earth Syst. Sci. Data

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Abstract. Global warming is expected to be most pronounced in the Arctic where permafrost thaw and release of old carbon may provide an important feedback mechanism to the climate system. To better understand and predict climate effects and feedbacks on the cycling of elements within and between ecosystems in northern latitude landscapes, a thorough understanding of the processes related to transport and cycling of elements is required. A fundamental requirement to reach a better process understanding is to have access to high-quality empirical data on chemical concentrations and biotic properties for a wide range of ecosystem domains and functional units (abiotic and biotic pools). The aim of this study is therefore to make one of the most extensive field data sets from a periglacial catchment readily available that can be used both to describe present-day periglacial processes and to improve predictions of the future. Here we present the sampling and analytical methods, field and laboratory equipment and the resulting biogeochemical data from a state-of-the-art whole-ecosystem investigation of the terrestrial and aquatic parts of a lake catchment in the Kangerlussuaq region, West Greenland. This data set allows for the calculation of whole-ecosystem mass balance budgets for a long list of elements, including carbon, nutrients and major and trace metals. The data set is freely available and can be downloaded from PANGAEA:

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Impact of degrading permafrost on subsurface solute transport pathways and travel times

Frampton

2015

Water Resour. Res.

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Subsurface solute transport under surface warming and degrading permafrost conditions is studied using a physically based model of coupled cryotic and hydrogeological flow processes combined with a particle tracking method. Changes in the subsurface water and inert solute pathways and travel times are analyzed for different modeled geological configurations. For all simulated cases, the minimum and mean travel times increase nonlinearly with warming irrespective of geological configuration and heterogeneity structure. The timing of the start of increase in travel time depends on heterogeneity structure, combined with the rate of permafrost degradation that also depends on material thermal and hydrogeological properties. The travel time changes depend on combined warming effects of: i) increase in pathway length due to deepening of the active layer, ii) reduced transport velocities due to a shift from horizontal saturated groundwater flow near the surface to vertical water percolation deeper into the subsurface, and iii) pathway length increase and temporary immobilization caused by cryosuction-induced seasonal freeze cycles.

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Data evaluation and numerical modeling of hydrological interactions between active layer, lake and talik in a permafrost catchment, Western Greenland

Cited by 53 publications

References 34 publications

The Importance of Eolian Input on Lake-Sediment Geochemical Composition in the Dry Proglacial Landscape of Western Greenland

The Importance of Eolian Input on Lake-Sediment Geochemical Composition in the Dry Proglacial Landscape of Western Greenland

Biogeochemical data from terrestrial and aquatic ecosystems in a periglacial catchment, West Greenland

Impact of degrading permafrost on subsurface solute transport pathways and travel times

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