- From November 2006 to January 2010, a sediment trap that was cleared monthly was deployed in Lake Challa, a deep stratified freshwater lake on the eastern slope of Mt. Kilimanjaro in southern Kenya. Geochemical data from sediment trap samples were compared with a broad range of limnological and meteorological parameters to characterize the effect of single parameters on productivity and sedimentation processes in the crater basin. During the southern hemisphere summer (November-March), when the water temperature is high and the lake is biologically productive (nondiatom algae), calcite predominated in the sediment trap samples. During the "long rain" season (March-May) a small amount of organic matter and lithogenic material caused by rainfall appeared. This was followed by the cool and windy months of the southern hemisphere winter (June-October) when diatoms were the main component, indicating a diatom bloom initiated by improvement of nutrient availability related to upwelling processes. The sediment trap data support theFrom November 2006 to January 2010, a sediment trap that was cleared monthly was deployed in Lake Challa, a deep stratified freshwater lake on the eastern slope of Mt. Kilimanjaro in southern Kenya. Geochemical data from sediment trap samples were compared with a broad range of limnological and meteorological parameters to characterize the effect of single parameters on productivity and sedimentation processes in the crater basin. During the southern hemisphere summer (November-March), when the water temperature is high and the lake is biologically productive (nondiatom algae), calcite predominated in the sediment trap samples. During the "long rain" season (March-May) a small amount of organic matter and lithogenic material caused by rainfall appeared. This was followed by the cool and windy months of the southern hemisphere winter (June-October) when diatoms were the main component, indicating a diatom bloom initiated by improvement of nutrient availability related to upwelling processes. The sediment trap data support the hypothesis that the light-dark lamination couplets, which are abundant in Lake Challa cores, reflect seasonal delivery to the sediments of diatom-rich particulates during the windy months and diatom-poor material during the wet season. However, interannual and spatial variability in upwelling and productivity patterns, as well as El Nino-Southern Oscillation (ENSO)-related rainfall and drought cycles, exert a strong influence on the magnitude and geochemical composition of particle export to the hypolimnion of Lake Challa.…
MetadatenVerfasserangaben: | Christian Michael WolffORCiDGND, Iris Kristen-Jenny, Georg Schettler, Birgit PlessenORCiDGND, Hanno MeyerORCiDGND, Peter Dulski, Rudolf Naumann, Achim BrauerORCiDGND, Dirk Verschuren, Gerald H. Haug |
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DOI: | https://doi.org/10.4319/lo.2014.59.5.1621 |
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ISSN: | 0024-3590 |
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ISSN: | 1939-5590 |
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Titel des übergeordneten Werks (Englisch): | Limnology and oceanography |
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Verlag: | Wiley |
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Verlagsort: | Waco |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Jahr der Erstveröffentlichung: | 2014 |
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Erscheinungsjahr: | 2014 |
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Datum der Freischaltung: | 27.03.2017 |
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Band: | 59 |
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Ausgabe: | 5 |
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Seitenanzahl: | 16 |
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Erste Seite: | 1621 |
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Letzte Seite: | 1636 |
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Fördernde Institution: | European Science Foundation Collaborative Research (ESF-EUROCORES)
program EuroClimate [CRP28-CHALLACEA]; Deutsche Forschungsgemeinschaft
(DFG); Leibniz Center for Earth Surface Process and Climate Studies;
Kenyan Ministry of Education, Science and Technology (MOEST)
[13/001/11C] |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Geowissenschaften |
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Peer Review: | Referiert |
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Name der Einrichtung zum Zeitpunkt der Publikation: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Erd- und Umweltwissenschaften |
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