Glacial forcing of central Indonesian hydroclimate since 60,000 y B.P.

Russell, J. M.; Vogel, Hendrik; Konecky, B. L.; Bijaksana, S.; Huang, Y.; Melles, M.; Wattrus, N.; Costa, K.; King, J. W. (2014). Glacial forcing of central Indonesian hydroclimate since 60,000 y B.P. Proceedings of the National Academy of Sciences of the United States of America - PNAS, 111(14), pp. 5100-5105. National Academy of Sciences NAS 10.1073/pnas.1402373111

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The Indo-Pacific warm pool houses the largest zone of deep
atmospheric convection on Earth and plays a critical role in global
climate variations. Despite the region’s importance, changes in
Indo-Pacific hydroclimate on orbital timescales remain poorly constrained.
Here we present high-resolution geochemical records of
surface runoff and vegetation from sediment cores fromLake Towuti,
on the island of Sulawesi in central Indonesia, that continuously
span the past 60,000 y.We show that wet conditions and rainforest
ecosystems on Sulawesi present during marine isotope stage 3 (MIS3)
and the Holocene were interrupted by severe drying between
∼33,000 and 16,000 y B.P. when Northern Hemisphere ice sheets
expanded and global temperatures cooled. Our record reveals
little direct influence of precessional orbital forcing on regional
climate, and the similarity between MIS3 and Holocene climates
observed in Lake Towuti suggests that exposure of the Sunda Shelf
has a weaker influence on regional hydroclimate and terrestrial
ecosystems than suggested previously. We infer that hydrological
variability in this part of Indonesia varies strongly in response to
high-latitude climate forcing, likely through reorganizations of the
monsoons and the position of the intertropical convergence zone.
These findings suggest an important role for the tropical western
Pacific in amplifying glacial–interglacial climate variability.

Item Type:	Journal Article (Original Article)
Division/Institute:	08 Faculty of Science > Institute of Geological Sciences 10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) 08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology
UniBE Contributor:	Vogel, Hendrik
Subjects:	500 Science > 550 Earth sciences & geology
ISSN:	0027-8424
Publisher:	National Academy of Sciences NAS
Language:	English
Submitter:	Hendrik Vogel
Date Deposited:	10 Sep 2014 14:21
Last Modified:	05 Dec 2022 14:34
Publisher DOI:	10.1073/pnas.1402373111
URI:	https://boris.unibe.ch/id/eprint/52340