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

Christian Wolff, Iris Kristen-Jenny, Georg Schettler, Birgit Plessen, Hanno Meyer, Peter Dulski, Rudolf Naumann, Achim Brauer, Dirk Verschuren UGent and Gerald H Haug (2014) LIMNOLOGY AND OCEANOGRAPHY. 59(5). p.1621-1636
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
HARDWATER LAKE, SHORT RAINS, LEVEL FLUCTUATIONS, RAINFALL VARIABILITY, SOUTHERN EAST-AFRICA, CLIMATE, KILIMANJARO, RECORD, ISOTOPE, DYNAMICS
journal title
LIMNOLOGY AND OCEANOGRAPHY
Limnol. Oceanogr.
volume
59
issue
5
pages
1621 - 1636
Web of Science type
Article
Web of Science id
000345462100014
JCR category
OCEANOGRAPHY
JCR impact factor
3.794 (2014)
JCR rank
3/61 (2014)
JCR quartile
1 (2014)
ISSN
0024-3590
DOI
10.4319/lo.2014.59.5.1621
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
5848373
handle
http://hdl.handle.net/1854/LU-5848373
date created
2015-02-13 20:30:39
date last changed
2016-12-19 15:42:58
@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 {\textacutedbl}long rain{\textacutedbl} 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},
  keyword      = {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},
}

Chicago
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.
APA
Wolff, Christian, Kristen-Jenny, I., Schettler, G., Plessen, B., Meyer, H., Dulski, P., Naumann, R., et al. (2014). Modern seasonality in Lake Challa (Kenya/Tanzania) and its sedimentary documentation in recent lake sediments. LIMNOLOGY AND OCEANOGRAPHY, 59(5), 1621–1636.
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.
MLA
Wolff, Christian, Iris Kristen-Jenny, Georg Schettler, et al. “Modern Seasonality in Lake Challa (Kenya/Tanzania) and Its Sedimentary Documentation in Recent Lake Sediments.” LIMNOLOGY AND OCEANOGRAPHY 59.5 (2014): 1621–1636. Print.