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Journal of Paleolimnology

, Volume 39, Issue 2, pp 237–252 | Cite as

Relationships between southern Chilean varved lake sediments, precipitation and ENSO for the last 600 years

  • Xavier Boës
  • Nathalie Fagel
Original Paper

Abstract

In this paper, the relationships between paleo-precipitation and the regional influence of El Nino Southern Oscillation (ENSO) in South America are assessed from a high-resolution calendar varve-thickness record. Two short laminated sediment cores (53 and 61 cm length) from Lago Puyehue (40° S) are analysed by continuous varve measurements through the last 600 years. The calendar varve years are determined by the occurrence of graded planktonic-rich layers. The annual sediment accumulation rates are reconstructed by using the standard varve-counting methods on thin sections. The 1980–2000 varve-thickness record is interpreted in terms of climate through correlation with limnological and local monthly instrumental climate databases. The comparison between the standardized varve thickness with the instrumental records reveals a strong correlation (r = 0.75, р = 0.07) between the total varve thickness and the austral autumn/winter precipitation. We argue that strong austral winter winds and precipitation are the forcing factors for the seasonal turn-over and phytoplankton increase in the lake sediments. During strong El Nino events the precipitation and the winds decrease abnormally, hence reducing the thickness of the biogenic sediments deposited after the winter turn-over. Our results show one significant regional maximum peak of winter precipitation (>900 mm) in the mid 20th century and a significant period with lower winter precipitation (<400 mm) before the 15th century, i.e., the late Medieval Warm Period. The first peak in the mid 20th century is confirmed by the regional precipitation database. The influence of ENSO cycles over the last 600 years is assessed by spectral analysis in Fagel et al. (2007). The possible influence of the regional volcanism and/or the seismic activity on the local climate record is also discussed.

Keywords

Chile Lake District Varve counting Varves ENSO Late Medieval Warm Period Last millennium 

Notes

Acknowledgements

This study has been financially supported by OSTC ENSO-Chile project (EV 12/10B, M. De Batist—coordinator). We particularly thank M. De Batist and M. Chapron who introduced X. Boës to ENSO project. We thank the Chambery teams (C. Beck, F. Arnaud, V. Lignier) for support, and the Chilean teams (A. Pena, R. Urrutia, W. San Martin) for assistance during the coring campaign in Lago Puyehue in 2002. We thank F. Boulvain, J.P. Culus and F. Noebert for laboratory access (ULg). Thanks are due to M. Sterken, L. Vargas Ramirez, F. Charlet and S. Bertrand for inter-attractive discussions that lead us to a better comprehension of Lago Puyehue sediments. The author thanks M.F. Loutre and A. Mackay for the helpful comments. X.B. is supported by a Ph-D FNRS-FRIA and CGRI grants.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Clays and Paleoclimate Research UnitUniversity of LiègeLiegeBelgium

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