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Northern Borneo stalagmite records reveal West Pacific hydroclimate across MIS 5 and 6

Carolin, Stacy A. and Cobb, Kim M. and Lynch-Stieglitz, Jean and Moerman, Jessica W. and Partin, Judson W. and Lejau, Syria and Malang, Jenny and Clark, Brian and Tuen, Andrew A. and Adkins, Jess F. (2016) Northern Borneo stalagmite records reveal West Pacific hydroclimate across MIS 5 and 6. Earth and Planetary Science Letters, 439 . pp. 182-193. ISSN 0012-821X.

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Over the past decades, tropical stalagmite δ^(18)O records have provided valuable insight on glacial and interglacial hydrological variability and its relationship to a variety of natural climate forcings. The transition out of the penultimate glaciation (MIS 6) represents an important target for tropical hydroclimate reconstructions, yet relatively few such reconstructions resolve this transition. Particularly, comparisons between Termination 1 and 2 provide critical insight on the extent and influence of proposed climate mechanisms determined from paleorecords and model experiments spanning the recent deglaciation. Here we present a new compilation of western tropical Pacific hydrology spanning 0–160 ky BP, constructed from eleven different U/Th-dated stalagmite δ^(18)O records from Gunung Mulu National Park in northern Borneo. The reconstruction exhibits significant precessional power in phase with boreal fall insolation strength over the 0–160 ky BP period, identifying precessional insolation forcing as the dominant driver of hydroclimate variability in northern Borneo on orbital timescales. A comparison with a network of paleoclimate records from the circum-Pacific suggests the insolation sensitivity may arise from changes in the Walker circulation system. Distinct millennial-scale increases in stalagmite δ^(18)O, indicative of reduced regional convection, occur within glacial terminations and may reflect a response to shifts in inter-hemispheric temperature gradients. Our results imply that hydroclimate in this region is sensitive to external forcing, with a response dominated by large-scale temperature gradients.

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Adkins, Jess F.0000-0002-3174-5190
Additional Information:© 2016 Elsevier B.V. Received 16 August 2015; Received in revised form 16 January 2016; Accepted 23 January 2016; Available online 11 February 2016. We thank Danja Mewes, Eleanor Middlemas, and Sang Chen for fieldwork assistance, and all the staff at Gunung Mulu National Park World Heritage Site for their dedicated assistance during field expeditions. We also thank Guillaume Paris, Sophie Hines, James Rae, and Andrea Burke for their assistance in U–Th dating, and Hussein Sayani, Pamela Grothe, and Tammy Chang for their assistance in oxygen isotope measurements. The research was funded by NSF PECASE Award #0645291 and NSF AGS Award #1502830 to KMC, NSF AGS award #0903099 to JFA, and a NSF Graduate Research Fellowship to SAC. Permits for this work were granted by the Malaysian Economic Planning Unit, the Sarawak State Planning Unit, and the Sarawak Forestry Department. All data reported in this paper are archived at NCDC (
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NSF Graduate Research FellowshipUNSPECIFIED
Subject Keywords:speleothem; stable isotopes; glacial cycles; Termination 2; penultimate interglacial; tropical west Pacific
Record Number:CaltechAUTHORS:20160401-073443500
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Official Citation:Stacy A. Carolin, Kim M. Cobb, Jean Lynch-Stieglitz, Jessica W. Moerman, Judson W. Partin, Syria Lejau, Jenny Malang, Brian Clark, Andrew A. Tuen, Jess F. Adkins, Northern Borneo stalagmite records reveal West Pacific hydroclimate across MIS 5 and 6, Earth and Planetary Science Letters, Volume 439, 1 April 2016, Pages 182-193, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:65831
Deposited By: Tony Diaz
Deposited On:01 Apr 2016 20:02
Last Modified:24 Feb 2020 10:30

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