Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2013
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.811079 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867172222959878144 |
|---|---|
| author | Helbig, Manuel Boike, Julia Langer, Moritz Schreiber, Peter Runkle, Benjamin R K Kutzbach, Lars |
| author_facet | Helbig, Manuel Boike, Julia Langer, Moritz Schreiber, Peter Runkle, Benjamin R K Kutzbach, Lars |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_811079 |
| institution | PANGAEA |
| language | en |
| publishDate | 2013 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Water balance measurements on Samoylov Island during campaign Lena2011 Helbig, Manuel Boike, Julia Langer, Moritz Schreiber, Peter Runkle, Benjamin R K Kutzbach, Lars Arctic Tundra; Evaporation; hydraulic conductivity; island; precipitation 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. |
| title | Water balance measurements on Samoylov Island during campaign Lena2011 |
| topic | Arctic Tundra; Evaporation; hydraulic conductivity; island; precipitation |
| url | https://doi.org/10.1594/PANGAEA.811079 |