Tropical climate changes at millennial and orbital timescales on the Bolivian Altiplano

Paul A. Baker (), Catherine A. Rigsby, Geoffrey O. Seltzer, Sherilyn C. Fritz, Tim K. Lowenstein, Niklas P. Bacher and Carlos Veliz
Additional contact information
Paul A. Baker: Duke University
Catherine A. Rigsby: East Carolina University
Geoffrey O. Seltzer: Syracuse University
Sherilyn C. Fritz: University of Nebraska
Tim K. Lowenstein: SUNY Binghamton
Niklas P. Bacher: Duke University
Carlos Veliz: Syracuse University

Nature, 2001, vol. 409, issue 6821, 698-701

Abstract: Abstract Tropical South America is one of the three main centres of the global, zonal overturning circulation of the equatorial atmosphere (generally termed the ‘Walker’ circulation1). Although this area plays a key role in global climate cycles, little is known about South American climate history. Here we describe sediment cores and down-hole logging results of deep drilling in the Salar de Uyuni, on the Bolivian Altiplano, located in the tropical Andes. We demonstrate that during the past 50,000 years the Altiplano underwent important changes in effective moisture at both orbital (20,000-year) and millennial timescales. Long-duration wet periods, such as the Last Glacial Maximum—marked in the drill core by continuous deposition of lacustrine sediments—appear to have occurred in phase with summer insolation maxima produced by the Earth's precessional cycle. Short-duration, millennial events correlate well with North Atlantic cold events, including Heinrich events 1 and 2, as well as the Younger Dryas episode. At both millennial and orbital timescales, cold sea surface temperatures in the high-latitude North Atlantic were coeval with wet conditions in tropical South America, suggesting a common forcing.

Date: 2001
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DOI: 10.1038/35055524

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