Younger Dryas-Holocene temperature and rainfall history of southern Indonesia from delta O-18 in speleothem calcite and fluid inclusions

Griffiths, ML, Drysdale, RN, Vonhof, HB, Gagan, MK, Zhao, JX, Ayliffe, LK, Hantoro, WS, Hellstrom, JC, Cartwright, I, Frisia, S and Suwargadi, BW (2010) Younger Dryas-Holocene temperature and rainfall history of southern Indonesia from delta O-18 in speleothem calcite and fluid inclusions. Earth and Planetary Science Letters, 295 1-2: 30-36. doi:10.1016/j.epsl.2010.03.018


Author Griffiths, ML
Drysdale, RN
Vonhof, HB
Gagan, MK
Zhao, JX
Ayliffe, LK
Hantoro, WS
Hellstrom, JC
Cartwright, I
Frisia, S
Suwargadi, BW
Title Younger Dryas-Holocene temperature and rainfall history of southern Indonesia from delta O-18 in speleothem calcite and fluid inclusions
Journal name Earth and Planetary Science Letters   Check publisher's open access policy
ISSN 0012-821X
1385-013X
Publication date 2010-06-15
Sub-type Article (original research)
DOI 10.1016/j.epsl.2010.03.018
Volume 295
Issue 1-2
Start page 30
End page 36
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Collection year 2011
Language eng
Formatted abstract
We have applied a new technique to analyze the oxygen (δ18O) and hydrogen (δD) isotope ratios in speleothem fluid inclusions to reconstruct the temperature and rainfall history of southern Indonesia during the Younger Dryas (YD) event and the Holocene. The 12,640-year speleothem record, anchored by 33 uranium-series dates, shows that fluid-inclusion δ18O values vary in phase with speleothem calcite δ18O during the Holocene, suggesting that the speleothem calcite δ18O primarily reflects variations in the δ18O of local rainfall. Significant early to mid-Holocene decreases in both δ18O series are interpreted as an intensification of Australian–Indonesian summer monsoon rainfall in response to deglacial eustatic sea-level rise and flooding of the Sunda Shelf.

Cave drip-water temperatures reconstructed from coupled measurements of δ18O in speleothem calcite and fluid inclusions remained relatively constant through the Holocene. This is consistent with reconstructions of Indo-Pacific sea-surface temperature (SST) based on analysis of Mg/Ca ratios in planktonic foraminifera. However, during the YD event, drip-water (i.e. cave) temperature was not, vert, similar 5 °C cooler than modern, which is substantially cooler than SSTs inferred from foraminiferal Mg/Ca, but consistent with coral Sr/Ca reconstructions of SST and terrestrial evidence for high-elevation snow-line depressions. Lower fluid-inclusion δ18O values during the YD indicate that the cooling was accompanied by increased monsoon rainfall. Taken together, the results suggest that the southerly penetration of the intertropical convergence zone (ITCZ) was largely influenced by the cross-equatorial temperature gradient, rather than local SSTs (and air temperatures). Our results provide new evidence for a rapid cooling of deep tropical air temperatures and repositioning of the ITCZ during the YD event.
Copyright © 2010 Elsevier B.V. All rights reserved.
Keyword Fluid inclusions
Speleothem
Indonesia
Monsoon
Stable isotopes
Younger Dryas
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Centre for Microscopy and Microanalysis Publications
 
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Created: Sun, 04 Jul 2010, 00:05:28 EST