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Reconstructing fluctuations of a shallow East African lake during the past 1800 yrs from sediment stratigraphy in a submerged crater basin

Dirk Verschuren UGent (2001) JOURNAL OF PALEOLIMNOLOGY. 25(3). p.297-311
abstract
The sedimentology of an 8.22-m long core of late-Holocene deposits in the submerged Crescent Island Crater basin of Lake Naivasha, Kenya, is used to reconstruct decade-scale fluctuations in lake-surface elevation during the past 1800 yrs. Lake-depth inference for the past 1000 yrs is semi-quantitative, based on (1) relationships between lake level and bottom dynamics predicted by wave theory, and (2) historical validation of the effects of lake-level fluctuation and hydrologic closure on sediment composition in Crescent Island Crater and nearby Lake Oloidien. In these shallow fluctuating lakes, organic-carbon variation in a lithological sequence from clayey mud to algal gyttja is positively correlated with lake depth at the time of deposition, because the focusing of oxidized littoral sediments which dilute autochthonous organic matter before burial is reduced during highstands. The lake-level reconstruction for Lake Naivasha agrees with other adequately dated lake-level records from equatorial East Africa in its implication of dry climatic conditions during the Mediaeval Warm Period and generally wet conditions during the Little Ice Age. Crescent Island Crater survived widespread aridity in the early-19th century as a fresh weedy pond, while the main basin of Lake Naivasha and many other shallow East African lakes fell dry and truncated their sediment archive of Little Ice Age climatic variability.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
diatom mats, Africa, lake level, Little Ice Age, Mediaeval Warm Period, organic carbon, paleoclimate, sedimentology, RIFT-VALLEY, HISTORY, DEPTH, KENYA, INDICATORS, RESOLUTION, NAIVASHA, HOLOCENE, TURKANA, RECORDS
journal title
JOURNAL OF PALEOLIMNOLOGY
J. Paleolimn.
volume
25
issue
3
pages
297 - 311
Web of Science type
Article
Web of Science id
000167852600003
JCR category
ENVIRONMENTAL SCIENCES
JCR impact factor
1.367 (2001)
JCR rank
32/128 (2001)
JCR quartile
1 (2001)
ISSN
0921-2728
DOI
10.1023/A:1011150300252
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
139521
handle
http://hdl.handle.net/1854/LU-139521
date created
2004-01-14 13:37:00
date last changed
2016-12-19 15:38:06
@article{139521,
  abstract     = {The sedimentology of an 8.22-m long core of late-Holocene deposits in the submerged Crescent Island Crater basin of Lake Naivasha, Kenya, is used to reconstruct decade-scale fluctuations in lake-surface elevation during the past 1800 yrs. Lake-depth inference for the past 1000 yrs is semi-quantitative, based on (1) relationships between lake level and bottom dynamics predicted by wave theory, and (2) historical validation of the effects of lake-level fluctuation and hydrologic closure on sediment composition in Crescent Island Crater and nearby Lake Oloidien. In these shallow fluctuating lakes, organic-carbon variation in a lithological sequence from clayey mud to algal gyttja is positively correlated with lake depth at the time of deposition, because the focusing of oxidized littoral sediments which dilute autochthonous organic matter before burial is reduced during highstands. The lake-level reconstruction for Lake Naivasha agrees with other adequately dated lake-level records from equatorial East Africa in its implication of dry climatic conditions during the Mediaeval Warm Period and generally wet conditions during the Little Ice Age. Crescent Island Crater survived widespread aridity in the early-19th century as a fresh weedy pond, while the main basin of Lake Naivasha and many other shallow East African lakes fell dry and truncated their sediment archive of Little Ice Age climatic variability.},
  author       = {Verschuren, Dirk},
  issn         = {0921-2728},
  journal      = {JOURNAL OF PALEOLIMNOLOGY},
  keyword      = {diatom mats,Africa,lake level,Little Ice Age,Mediaeval Warm Period,organic carbon,paleoclimate,sedimentology,RIFT-VALLEY,HISTORY,DEPTH,KENYA,INDICATORS,RESOLUTION,NAIVASHA,HOLOCENE,TURKANA,RECORDS},
  language     = {eng},
  number       = {3},
  pages        = {297--311},
  title        = {Reconstructing fluctuations of a shallow East African lake during the past 1800 yrs from sediment stratigraphy in a submerged crater basin},
  url          = {http://dx.doi.org/10.1023/A:1011150300252},
  volume       = {25},
  year         = {2001},
}

Chicago
Verschuren, Dirk. 2001. “Reconstructing Fluctuations of a Shallow East African Lake During the Past 1800 Yrs from Sediment Stratigraphy in a Submerged Crater Basin.” Journal of Paleolimnology 25 (3): 297–311.
APA
Verschuren, D. (2001). Reconstructing fluctuations of a shallow East African lake during the past 1800 yrs from sediment stratigraphy in a submerged crater basin. JOURNAL OF PALEOLIMNOLOGY, 25(3), 297–311.
Vancouver
1.
Verschuren D. Reconstructing fluctuations of a shallow East African lake during the past 1800 yrs from sediment stratigraphy in a submerged crater basin. JOURNAL OF PALEOLIMNOLOGY. 2001;25(3):297–311.
MLA
Verschuren, Dirk. “Reconstructing Fluctuations of a Shallow East African Lake During the Past 1800 Yrs from Sediment Stratigraphy in a Submerged Crater Basin.” JOURNAL OF PALEOLIMNOLOGY 25.3 (2001): 297–311. Print.