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Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments

(2014) LIMNOLOGY AND OCEANOGRAPHY. 59(5). p.1621-1636
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Organization
Abstract
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 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.
Keywords
HARDWATER LAKE, SHORT RAINS, LEVEL FLUCTUATIONS, RAINFALL VARIABILITY, SOUTHERN EAST-AFRICA, CLIMATE, KILIMANJARO, RECORD, ISOTOPE, DYNAMICS

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Citation

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MLA
Wolff, Christian, et al. “Modern Seasonality in Lake Challa (Kenya/Tanzania) and Its Sedimentary Documentation in Recent Lake Sediments.” LIMNOLOGY AND OCEANOGRAPHY, vol. 59, no. 5, 2014, pp. 1621–36, doi:10.4319/lo.2014.59.5.1621.
APA
Wolff, C., Kristen-Jenny, I., Schettler, G., Plessen, B., Meyer, H., Dulski, P., … Haug, G. H. (2014). Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments. LIMNOLOGY AND OCEANOGRAPHY, 59(5), 1621–1636. https://doi.org/10.4319/lo.2014.59.5.1621
Chicago author-date
Wolff, Christian, Iris Kristen-Jenny, Georg Schettler, Birgit Plessen, Hanno Meyer, Peter Dulski, Rudolf Naumann, Achim Brauer, Dirk Verschuren, and Gerald H Haug. 2014. “Modern Seasonality in Lake Challa (Kenya/Tanzania) and Its Sedimentary Documentation in Recent Lake Sediments.” LIMNOLOGY AND OCEANOGRAPHY 59 (5): 1621–36. https://doi.org/10.4319/lo.2014.59.5.1621.
Chicago author-date (all authors)
Wolff, Christian, Iris Kristen-Jenny, Georg Schettler, Birgit Plessen, Hanno Meyer, Peter Dulski, Rudolf Naumann, Achim Brauer, Dirk Verschuren, and Gerald H Haug. 2014. “Modern Seasonality in Lake Challa (Kenya/Tanzania) and Its Sedimentary Documentation in Recent Lake Sediments.” LIMNOLOGY AND OCEANOGRAPHY 59 (5): 1621–1636. doi:10.4319/lo.2014.59.5.1621.
Vancouver
1.
Wolff C, Kristen-Jenny I, Schettler G, Plessen B, Meyer H, Dulski P, et al. Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments. LIMNOLOGY AND OCEANOGRAPHY. 2014;59(5):1621–36.
IEEE
[1]
C. Wolff et al., “Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments,” LIMNOLOGY AND OCEANOGRAPHY, vol. 59, no. 5, pp. 1621–1636, 2014.
@article{5848373,
  abstract     = {{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 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.}},
  author       = {{Wolff, Christian and Kristen-Jenny, Iris and Schettler, Georg and Plessen, Birgit and Meyer, Hanno and Dulski, Peter and Naumann, Rudolf and Brauer, Achim and Verschuren, Dirk and Haug, Gerald H}},
  issn         = {{0024-3590}},
  journal      = {{LIMNOLOGY AND OCEANOGRAPHY}},
  keywords     = {{HARDWATER LAKE,SHORT RAINS,LEVEL FLUCTUATIONS,RAINFALL VARIABILITY,SOUTHERN EAST-AFRICA,CLIMATE,KILIMANJARO,RECORD,ISOTOPE,DYNAMICS}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{1621--1636}},
  title        = {{Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments}},
  url          = {{http://dx.doi.org/10.4319/lo.2014.59.5.1621}},
  volume       = {{59}},
  year         = {{2014}},
}

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