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- W66438577 abstract "This study deals with the measurement and analysis of the water balance of anarctic tundra site in Siberia on the island of Samoylov (Lena River Delta, Russia). Theisland is underlain by continuous permafrost and is characterized by polygonal tundrastructures. The quantification of precipitation, evapotranspiration, runoff and storage inthe annual water budget was in the focus of this research. Furthermore, it was the goalto identify the relevant processes and seasonal dynamics which characterise the waterbalance. In addition to the data of the existing monitoring network (e.g. precipitationand evapotranspiration), spatially distributed runoff and water level measurements wereobtained. The results of the measurements indicates a negative summer water balance(–23.3 mm), in which the evapotranspiration (190.9 mm) clearly exceeded the rainfall(167.6 mm). In the annual water balance the snow cover (65 mm) was a major source ofwater. The spring snowmelt was the principal recharge mechanism for the tundra. Therunoff (4.8 mm) in the summertime was small compared to the other components of thewater balance. Storage changes (soils, lakes, cracks and polygon ponds) are mainlycontrolled by precipitation and evapotranspiration. The importance of lateralgroundwater fluxes increases towards the end of summer due to a maximum of activelayer thickness, a high amount of rain and a raising water level in lakes and polygonponds. The annual water balance is primarily determined by rainfall andevapotranspiration. The shallow active layer limits the lateral water movement, such asgroundwater flow and runoff from the island. Variations in environmental and climateconditions due to climate change may have severe impacts on the water balance.Assumed higher evapotranspiration and increased active layer thickness could multiplythe water losses and enhanced the degradation of the polygonal tundra landscape. Thispotentially leads to increased green house gas emissions, since the availability of carbonand other nutriens for biological processes strongly depends on water flow." @default.
- W66438577 created "2016-06-24" @default.
- W66438577 creator A5035180304 @default.
- W66438577 date "2012-06-25" @default.
- W66438577 modified "2023-09-27" @default.
- W66438577 title "Wasserbilanz eines arktischen polygonalen Tundra-Standortes (Lena-Delta, Sibirien)" @default.
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