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Setiawan, Riza Yuliratno; Mohtadi, Mahyar; Southon, John; Groeneveld, Jeroen; Steinke, Stephan; Hebbeln, Dierk (2016): Measurement results of δ¹⁸O, Mg/Ca, and Ti/Ca of sediment cores GeoB10042-1 and GeoB10043-3. PANGAEA, https://doi.org/10.1594/PANGAEA.858602, Supplement to: Setiawan, RY et al. (2015): The consequences of opening the Sunda Strait on the hydrography of the eastern tropical Indian Ocean. Paleoceanography, 30(10), 1358-1372, https://doi.org/10.1002/2015PA002802

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Abstract:
The advection of relatively fresh Java Sea water through the Sunda Strait is presently responsible for the low-salinity "tongue" in the eastern tropical Indian Ocean with salinities as low as 32 per mil. The evolution of the hydrologic conditions in the eastern tropical Indian Ocean since the last glacial period, when the Sunda shelf was exposed and any advection via the Sunda Strait was cutoff, and the degree to which these conditions were affected by the Sunda Strait opening are not known. Here we have analyzed two sediment cores (GeoB 10042-1 and GeoB 10043-3) collected from the eastern tropical Indian Ocean off the Sunda Strait that cover the past ~40,000 years. We investigate the magnitude of terrigenous supply, sea surface temperature (SST), and seawater d18O (d18Osw) changes related to the sea level-driven opening of the Sunda Strait. Our new spliced records off the Sunda Strait show that during the last glacial, average SST was cooler and d18Osw was higher than elsewhere in the eastern tropical Indian Ocean. Seawater d18O decreased ~0.5 per mil after the opening of the Sunda Strait at ~10 kyr B.P. accompanied by an SST increase of 1.7°C. We suggest that fresher sea surface conditions have persisted ever since due to a continuous transport of low-salinity Java Sea water into the eastern tropical Indian Ocean via the Sunda Strait that additionally increased marine productivity through the concomitant increase in terrigenous supply.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Coverage:
Median Latitude: -7.211335 * Median Longitude: 104.850585 * South-bound Latitude: -7.309170 * West-bound Longitude: 104.642500 * North-bound Latitude: -7.113500 * East-bound Longitude: 105.058670
Date/Time Start: 2005-08-19T04:41:00 * Date/Time End: 2005-08-19T14:04:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
6 datasets

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Datasets listed in this publication series

  1. Setiawan, RY; Mohtadi, M; Southon, J et al. (2016): (Table 1) AMS 14C and calendar ages obtained frompPlanktic foraminifera shells in sediment cores GeoB10042-11 and GeoB10043-3. https://doi.org/10.1594/PANGAEA.858600
  2. Setiawan, RY; Mohtadi, M; Southon, J et al. (2015): (Supplement Table S1) Measurement results of δ¹⁸O and Mg/Ca of sediment core GeoB10042-1. https://doi.org/10.1594/PANGAEA.858590
  3. Setiawan, RY; Mohtadi, M; Southon, J et al. (2015): (Supplement Table S1) Measurement results of Ti/Ca of sediment core GeoB10042-1. https://doi.org/10.1594/PANGAEA.858591
  4. Setiawan, RY; Mohtadi, M; Southon, J et al. (2015): (Supplement Table S2) Measurement results of δ¹⁸O and Mg/Ca of sediment core GeoB10043-3. https://doi.org/10.1594/PANGAEA.858594
  5. Setiawan, RY; Mohtadi, M; Southon, J et al. (2015): (Supplement Table S2) Measurement results of Ti/Ca of sediment core GeoB10043-3. https://doi.org/10.1594/PANGAEA.858595
  6. Setiawan, RY; Mohtadi, M; Southon, J et al. (2015): (Supplement Table S3) Spliced records of GeoB10042-1 and GeoB10043-3. https://doi.org/10.1594/PANGAEA.858597