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Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25,000 years

Metcalfe, S.E.; Whitney, B.S.; Fitzpatrick, K.A.; Mayle, F.E.; Loader, N.J.; Street-Perrott, F.A.; Mann, D.E.

Authors

S.E. Metcalfe sarah.metcalfe@nottingham.ac.uk

B.S. Whitney

K.A. Fitzpatrick

F.E. Mayle

N.J. Loader

F.A. Street-Perrott

D.E. Mann



Abstract

Diatom, geochemical and isotopic data provide a record of environmental change in Laguna La Gaiba, lowland Bolivia, over the last ca. 25 000 years. High-resolution diatom analysis around the last glacial–interglacial transition provides new insights into this period of change. The full and late glacial lake was generally quite shallow, but with evidence of periodic flooding. At about 13,100 cal a BP, just before the start of the Younger Dryas chronozone, the diatoms indicate shallower water conditions, but there is a marked change at about 12,200 cal a BP indicating the onset of a period of high variability, with rising water levels
punctuated by periodic drying. From ca. 11,800 to 10,000 cal a BP stable, deeper water conditions persisted. There is evidence for drying in the early to middle Holocene, but not as pronounced as that reported from elsewhere in the southern hemisphere tropics of South America. This was followed by the onset of wetter conditions in the late Holocene consistent with insolation forcing. Conditions very similar to present were established about 2,100 cal a BP. A complex response to both insolation forcing and millennial scale events originating in the North Atlantic is noted.

Journal Article Type Article
Publication Date Jan 1, 2014
Journal Journal of Quaternary Science
Print ISSN 0267-8179
Electronic ISSN 0267-8179
Publisher Wiley
Peer Reviewed Not Peer Reviewed
Volume 29
Issue 3
APA6 Citation Metcalfe, S., Whitney, B., Fitzpatrick, K., Mayle, F., Loader, N., Street-Perrott, F., & Mann, D. (2014). Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25,000 years. Journal of Quaternary Science, 29(3), doi:10.1002/jqs.2702
DOI https://doi.org/10.1002/jqs.2702
Publisher URL http://onlinelibrary.wiley.com/doi/10.1002/jqs.2702/abstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is the pre-peer reviewed version of the following article: Metcalfe, S.E., Whitney, B.S., Fitzpatrick, K.A., Mayle, F.E., Loader, N.J., Street-Perrott, F.A. and Mann, D.G. (2014), Hydrology and climatology at Laguna La Gaiba, lowland Bolivia: complex responses to climatic forcings over the last 25 000 years. Journal of Quaternary Science, 29, 289–300, which has been published in final form at: http://onlinelibrary.wi....1002/jqs.2702/abstract

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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