Xu, Jian; Kuhnt, Wolfgang; Holbourn, Ann E; Regenberg, Marcus; Andersen, Nils (2010): Stable oxygen isotope and Mg/Ca ratios of planktonic foraminifera from the Holocene and the Last Glacial Maximum [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.831190, Supplement to: Xu, J et al. (2010): Indo-Pacific Warm Pool variability during the Holocene and Last Glacial Maximum. Paleoceanography, 25(4), PA4230, https://doi.org/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 ~3°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.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -3.106885 * Median Longitude: 125.819889 * South-bound Latitude: -15.310930 * West-bound Longitude: 111.525000 * North-bound Latitude: 19.456700 * East-bound Longitude: 159.361000
Date/Time Start: 1990-02-17T00:00:00 * Date/Time End: 2008-03-06T07:58:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Xu, J; Kuhnt, W; Holbourn, AE et al. (2014): (Table S2) Age determination of sediment cores from the Indo-Pacific. https://doi.org/10.1594/PANGAEA.831187
- Xu, J; Kuhnt, W; Holbourn, AE et al. (2014): (Table S2) Oxygen isotopes and uncorrected Mg/Ca ratios in Holocene last glacial maximum samples of the Indo-Pacific. https://doi.org/10.1594/PANGAEA.831188