van Dijk, Joep; Ziegler, Martin; de Nooijer, Lennart Jan; Reichart, Gert-Jan; Xuan, Chuang; Ducassou, Emmanuelle; Bernasconi, Stefano M; Lourens, Lucas Joost (2018): Glacial Mediterranean Outflow recoinstruction at IODP Site 339-U1390 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.884623, Supplement to: van Dijk, J et al. (2018): A Saltier Glacial Mediterranean Outflow. Paleoceanography and Paleoclimatology, 33(2), 179-197, https://doi.org/10.1002/2017PA003228
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Abstract:
The state of Atlantic Meridional Overturning Circulation (AMOC) is influenced by both the strength and the location of the Mediterranean Outflow (MOW) plume in the Gulf of Cadiz. To evaluate the influence of MOW on AMOC over deglaciations, precise and accurate salinity and temperature reconstructions are needed. For this purpose, we measured Mg/Ca and clumped isotopes of several benthic foraminiferal species at IODP Site U1390 in the Gulf of Cadiz. The clumped isotope results of Cibicidoides pachyderma, Uvigerina mediterranea and Pyrgo spp. are consistent between species and record no significant difference in Glacial to Holocene DWT. Over the deglaciation, the Mg/Ca-based temperatures derived from U. mediterranea indicate three periods of MOW absence at site U1390. Mg/Ca-based temperatures of Hoeglundina elegans and C. pachyderma are on average 6 °C too cold when compared to the present core-top temperature, which we explain by a carbonate ion effect on these epibenthic species related to the high alkalinity of the MOW. Combining DWT estimates with the benthic oxygen isotope data and considering different relationships between seawater oxygen isotopes and salinity, we infer a salinity decrease of MOWby 3 to 8 units over the deglaciation, and 4 units during S1, accounting for the global d18O depletion due to the decrease in ice volume. Our findings confirm that the Mediterranean Sea accumulates excess salt during a glacial low stand, and suggest that this salt surged into the Atlantic over the deglaciation, presumably during HS1.
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Coverage:
Median Latitude: 36.318680 * Median Longitude: -7.717926 * South-bound Latitude: 36.317312 * West-bound Longitude: -7.718025 * North-bound Latitude: 36.319110 * East-bound Longitude: -7.717790
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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9 datasets
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Datasets listed in this publication series
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Sample identification and ages of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884620
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Benthic foraminifera of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884645
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Elemental ratios and BWT reconstruction for IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884622
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Clumped isotopic signatures of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884621
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Clumped salinity reconstruction for IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884651
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Grain size distribution of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884648
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Benthic foraminiferal isotope ratios of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884646
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Isotope ratios of Globigerina bulloides of IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884647
- van Dijk, J; Ziegler, M; de Nooijer, LJ et al. (2018): Salinity reconstruction based on Mg/Ca ratios for IODP Site 339-U1390. https://doi.org/10.1594/PANGAEA.884654