[OANNES Foro] Stalagmites from Borneo show how the climate of the western equatorial Pacific region changed over the past 100, 000 years

[Mario Cabrejos]

Published Online June 6 2013
Science 28 June 2013: 
Vol. 340 no. 6140 pp. 1564-1566 
DOI: 10.1126/science.1233797 
http://www.sciencemag.org/content/340/6140/1564.abstract


Varied Response of Western Pacific Hydrology to Climate Forcings over the Last Glacial Period
Stacy A. Carolin1,*, Kim M. Cobb1, Jess F. Adkins2, Brian Clark3, Jessica L. Conroy1, Syria Lejau3, Jenny Malang3, Andrew A. Tuen4
1School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA. 2Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA. 3Gunung Mulu National Park, Sarawak, Malaysia. 4Institute of Biodiversity and Environmental Conservation, Universiti Malaysia Sarawak, Sarawak, Malaysia. ?*Corresponding author. E-mail: stacy.carolin en gatech.edu

Abstract

Atmospheric deep convection in the west Pacific plays a key role in the global heat and moisture budgets, yet its response to orbital and abrupt climate change events is poorly resolved. Here, we present four absolutely dated, overlapping stalagmite oxygen isotopic records from northern Borneo that span most of the last glacial cycle. The records suggest that northern Borneo's hydroclimate shifted in phase with precessional forcing but was only weakly affected by glacial-interglacial changes in global climate boundary conditions. Regional convection likely decreased during Heinrich events, but other Northern Hemisphere abrupt climate change events are notably absent. The new records suggest that the deep tropical Pacific hydroclimate variability may have played an important role in shaping the global response to the largest abrupt climate change events. 
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