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A 50,000-yr Pollen Record from Chile of South American Millennial-Scale Climate Instability during the Last Glaciation

Published online by Cambridge University Press:  20 January 2017

Linda Heusser ,
Calvin Heusser ,
Adam Kleczkowski  and
Simon Crowhurst
Linda Heusser
Affiliation:
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, 10965
Calvin Heusser
Affiliation:
100 Clinton Road, Tuxedo, New York, 10987
Adam Kleczkowski
Affiliation:
Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, United Kingdom
Simon Crowhurst
Affiliation:
Godwin Institute of Quaternary Research, University of Cambridge, Cambridge, CB2 3SA, United Kingdom
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Abstract

High-resolution (∼≤100 yr sampling interval) Chilean pollen data between ∼10,000 and 60,000 cal yr B.P. exhibit systematic fluctuations in Subantarctic Parkland development. These variations are dominated by a 30,000–40,000-yr cycle similar to that in the Northern Hemisphere GISP2 δ18O data and other climatic records. Both Chilean and GISP2 data show oscillations in the 5000–12,000 and 1000–3000-yr period bands. The coherence is, however, generally low, and distribution of power spectra differs, with the dynamics of the pollen assemblage dominated by a combination of 12,000- and 5000-yr cycles. We suggest a preferential nonlinear response of Chilean vegetation to climatic forcing and interhemispheric differences as possible mechanisms underlying the resemblances and dissimilarities between both records.

Keywords

pollenSouth Americamillennial-scale paleoclimate cyclesinterhemispheric comparisonQuaternary
Type
Research Article
Information
Quaternary Research , Volume 52 , Issue 2 , September 1999 , pp. 154 - 158
Copyright
University of Washington

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