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  Spatial and seasonal variability of polygonal tundra water balance: Lena River Delta, northern Siberia (Russia)

Helbig, M., Boike, J., Langer, M., Schreiber, P., Runkle, B., & Kutzbach, L. (2013). Spatial and seasonal variability of polygonal tundra water balance: Lena River Delta, northern Siberia (Russia). Hydrogeology Journal, 21(1), 133-147. doi:10.1007/s10040-012-0933-4.

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 Creators:
Helbig, Manuel, Author
Boike, Julia, Author              
Langer, Moritz, Author
Schreiber, Peter, Author              
Runkle, Benjamin1, Author              
Kutzbach, Lars1, Author              
Affiliations:
1CRG Regional Hydrology in Terrestrial Systems, Research Area B: Climate Manifestations and Impacts, The CliSAP Cluster of Excellence, External Organizations, ou_2025292              

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Free keywords: ENERGY-BALANCE; HYDRAULIC CONDUCTIVITY; RUNOFF GENERATION; FLUX MEASUREMENTS; CARBON-CYCLE; ACTIVE LAYER; WETLAND; HYDROLOGY; ENVIRONMENT; BASINWater balance; Permafrost; Heterogeneity; Wetlands; Russia;
 Abstract: The summer water balance of a typical Siberian polygonal tundra catchment is investigated in order to identify the spatial and temporal dynamics of its main hydrological processes. The results show that, besides precipitation and evapotranspiration, lateral flow considerably influences the site-specific hydrological conditions. The prominent microtopography of the polygonal tundra strongly controls lateral flow and storage behaviour of the investigated catchment. Intact rims of low-centred polygons build hydrological barriers, which release storage water later in summer than polygons with degraded rims and troughs above degraded ice wedges. The barrier function of rims is strongly controlled by soil thaw, which opens new subsurface flow paths and increases subsurface hydrological connectivity. Therefore, soil thaw dynamics determine the magnitude and timing of subsurface outflow and the redistribution of storage within the catchment. Hydraulic conductivities in the elevated polygonal rims sharply decrease with the transition from organic to mineral layers. This interface causes a rapid shallow subsurface drainage of rainwater towards the depressed polygon centres and troughs. The re-release of storage water from the centres through deeper and less conductive layers helps maintain a high water table in the surface drainage network of troughs throughout the summer.

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Language(s): eng - English
 Dates: 2013-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000314333600011
DOI: 10.1007/s10040-012-0933-4
 Degree: -

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Title: Hydrogeology Journal
Source Genre: Journal
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Publ. Info: 233 SPRING ST, NEW YORK, NY 10013 USA : Springer
Pages: - Volume / Issue: 21 (1) Sequence Number: - Start / End Page: 133 - 147 Identifier: ISSN: 1431-2174