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Rapid Changes in the Hydrologic Cycle of the Tropical Atlantic During the Last Glacial
Larry C. Peterson,1*Gerald H. Haug,2Konrad A. Hughen,3Ursula Röhl4
Sedimentary time series of color reflectance and major
element chemistry from the anoxic Cariaco Basin off the coast of
northernVenezuela record large and abrupt shifts in the hydrologic
cycleof the tropical Atlantic during the past 90,000 years. Marineproductivity maxima and increased precipitation and riverine dischargefrom northern South America are closely linked to interstadial(warm)
climate events of marine isotope stage 3, as recorded inGreenland ice
cores. Increased precipitation at this latitudeduring interstadials
suggests the potential for greater moistureexport from the Atlantic to
Pacific, which could have affectedthe salinity balance of the Atlantic
and increased thermohalineheat transport to high northern latitudes.
This supports the notionthat tropical feedbacks played an
important role in modulatingglobal climate during the last glacial
period.
1 Rosenstiel School of Marine and Atmospheric
Science, University of Miami, Miami, FL 33149, USA.
2 Department of Earth Sciences, Swiss Federal
Institute of Technology (ETH), CH-8092 Zürich, Switzerland.
3 Woods Hole Oceanographic Institution, Woods Hole,
MA 02543, USA.
4 Fachbereich Geowissenschaften,
Universität Bremen, D-28334 Bremen, Germany.
*
To whom correspondence should be addressed. E-mail:
lpeterson{at}rsmas.miami.edu
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In Science Magazine
PERSPECTIVES
Laurent Labeyrie (8 December 2000) Science290 (5498), 1905.
[DOI: 10.1126/science.290.5498.1905] |Summary »|Full Text »
REPORTS
Konrad A. Hughen, John R. Southon, Scott J. Lehman, and Jonathan T. Overpeck (8 December 2000) Science290 (5498), 1951.
[DOI: 10.1126/science.290.5498.1951] |Abstract »|Full Text »|PDF »|Supplemental Data »
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