Indo-Pacific Warm Pool variability during the Holocene and Last Glacial Maximum

Xu, J. A., Kuhnt, W., Holbourn, A., Regenberg, M. and Andersen, N. (2010) Indo-Pacific Warm Pool variability during the Holocene and Last Glacial Maximum Paleoceanography, 25 . DOI Pa4230 10.1029/2010pa001934.

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Abstract

We measured oxygen isotopes and Mg/Ca ratios in the surface-dwelling planktonic foraminifer Globigerinoides ruber (white s.s.) and the thermocline dweller Pulleniatina obliquiloculata to investigate upper ocean spatial variability in the Indo-Pacific Warm Pool (IPWP). We focused on three critical time intervals: the Last Glacial Maximum (LGM; 18-21.5 ka), the early Holocene (8-9 ka), and the late Holocene (0-2 ka). Our records from 24 stations in the South China Sea, Timor Sea, Indonesian seas, and western Pacific indicate overall dry and cool conditions in the IPWP during the LGM with a low thermal gradient between surface and thermocline waters. During the early Holocene, sea surface temperatures increased by similar to 3 degrees C over the entire region, indicating intensification of the IPWP. However, in the eastern Indian Ocean (Timor Sea), the thermocline gradually shoaled from the LGM to early Holocene, reflecting intensification of the subsurface Indonesian Throughflow (ITF). Increased surface salinity in the South China Sea during the Holocene appears related to northward displacement of the monsoonal rain belt over the Asian continent together with enhanced influx of saltier Pacific surface water through the Luzon Strait and freshwater export through the Java Sea. Opening of the freshwater portal through the Java Sea in the early Holocene led to a change in the vertical structure of the ITF from surface- to thermocline-dominated flow and to substantial freshening of Timor Sea thermocline waters.

Document Type: Article
Keywords: south china sea east-asian monsoon intertropical convergence zone western tropical pacific indonesian throughflow surface-temperature equatorial pacific planktonic-foraminifera climate variability heat-transport
Research affiliation: Kiel University > Faculty of Mathematics and Natural Sciences > Institute of Geosciences
Kiel University > Other > Leibniz-Laboratory for Radiometric Dating and Isotope Research
UNSPECIFIED
UNSPECIFIED
Kiel University > Other > Leibniz-Laboratory for Radiometric Dating and Isotope Research
Refereed: No
DOI etc.: Pa4230 10.1029/2010pa001934
ISSN: 0883-8305
Date Deposited: 22 Dec 2011 05:36
Last Modified: 09 Oct 2012 03:56
URI: http://eprints.uni-kiel.de/id/eprint/15731

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