Southern hemispheric westerlies control the spatial distribution of modern sediments in Laguna Potrok Aike,Argentina |
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| Authors: | Stephanie Kastner Christian Ohlendorf Torsten Haberzettl Andreas Lücke Christoph Mayr Nora I Maidana Frank Schäbitz Bernd Zolitschka |
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| Institution: | 1.Geomorphology and Polar Research (GEOPOLAR), Institute of Geography,University of Bremen,Bremen,Germany;2.Physical Geography, Institute of Geography,Friedrich-Schiller-University Jena,Jena,Germany;3.Institute of Chemistry and Dynamics of the Geosphere 4, Agrosphere (ICG 4), Energy & Environment, Research Center Jülich,Jülich,Germany;4.Geo Bio-Center and Department of Earth & Environmental Sciences,University of Munich,Munich,Germany;5.Institute of Geography,Friedrich-Alexander-University Erlangen-Nuremberg,Erlangen,Germany;6.Department of Biodiversity and Experimental Biology,University of Buenos Aires-CONICET,Buenos Aires,Argentina;7.Seminar for Geography and Education,University of Cologne,Cologne,Germany |
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| Abstract: | We studied the internal lake processes that control the spatial distribution and characteristics of modern sediments at the
ICDP (International Continental Scientific Drilling Program) deep drilling site in Laguna Potrok Aike, southern Patagonia,
Argentina. Sediment distribution patterns were investigated using a dense grid of 63 gravity cores taken throughout the lake
basin and 40 additional shoreline samples. Analysis of the surficial sediment distribution points to distinct internal depositional
dynamics induced by wind-driven lake internal currents. Distribution maps illustrate that the spatial characteristics of analysed
variables are linked to high erosional wave activity. Persistent wave action and littoral erosion along all shores, especially
the eastern shore, is caused by prevailing Southern Hemispheric Westerlies. Several sediment variables (grain size, benthic
diatoms, total inorganic carbon and calcium) indicate re-suspension of littoral sediment followed by re-distribution to profundal
accumulation areas near the eastern shore. Variations within the catchment influence sediment characteristics in the north-eastern
bay. That area is characterized by different mineralogical and sedimentological conditions as well as greater accumulation
of pollen, inorganic carbon and diatoms. These findings are related to the influence of episodic inflow into this bay. Spatial
differences in stable isotope values throughout the lake suggest that ephemeral tributaries around the lake basin may also
contribute to the detected spatial sediment variations. |
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