Citation:

2017PA003228

Name: Glacial Mediterranean Outflow recoinstruction at IODP Site 339-U1390
Published: 2018-01-05
License: https://creativecommons.org/licenses/by/3.0/

Always quote citation above when using data! You can download the citation in several formats below.

Published: 2018-01-05 • DOI registered: 2018-02-05

RIS Citation BibTeX Citation Text Citation ShareShow Map Google Earth

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.

Project(s):

Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)

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)

Size:

9 datasets

Download Data

Download ZIP file containing all datasets as tab-delimited text — use the following character encoding:

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