Measurement results of d18O, Mg/Ca, and Ti/Ca of sediment cores GeoB10042-1 and GeoB10043-3
Cobertura |
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 |
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Data(s) |
07/03/2016
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Resumo |
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. |
Formato |
application/zip, 6 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.858602 doi:10.1594/PANGAEA.858602 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Setiawan, Riza Yuliratno; Mohtadi, Mahyar; Southon, John; Groeneveld, Jeroen; Steinke, Stephan; Hebbeln, Dierk (2015): The consequences of opening the Sunda Strait on the hydrography of the eastern tropical Indian Ocean. Paleoceanography, 30(10), 1358-1372, doi:10.1002/2015PA002802 |
Palavras-Chave | #1 Sigma; Age; AGE; Age, 14C AMS; Age, 14C calibrated, CALIB 7.0-MARINE 13 program (Reimer et al. 2013); Age, dated; Age, dated material; Age, dated standard deviation; Age, reference; Age dated; Age ref; Age std dev; B.P.; Calculated; Calculated from Mg/Ca ratios; Calendar years; Calendar years, standard deviation; Cal yrs; Cal yrs std dev; Center for Marine Environmental Sciences; Comment; d18O H2O; Dated material; delta 18O, water; Depth; Depth, relative; DEPTH, sediment/rock; Depth rel; Error; Event; G. ruber ss d18O; G. ruber ss Mg/Ca; Globigerinoides ruber sensu stricto, d18O; Globigerinoides ruber sensu stricto, Magnesium/Calcium ratio; Lab label; Laboratory code/label; log(Ti/Ca); log-Titanium/Calcium ratio; MARUM; Mass spectrometer Finnigan MAT 251; relative sea level; Sea surface temperature, annual mean; seawater; SST (1-12); XRF |
Tipo |
Dataset |