Glacial Mediterranean Outflow recoinstruction at IODP Site 339-U1390
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| Format: | Dataset Open Access |
| Langue: | en |
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PANGAEA
2018
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| _version_ | 1867168571235237888 |
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| author | van Dijk, Joep Ziegler, Martin de Nooijer, Lennart Jan Reichart, Gert-Jan Xuan, Chuang Ducassou, Emmanuelle Bernasconi, Stefano M Lourens, Lucas Joost |
| author_facet | van Dijk, Joep Ziegler, Martin de Nooijer, Lennart Jan Reichart, Gert-Jan Xuan, Chuang Ducassou, Emmanuelle Bernasconi, Stefano M Lourens, Lucas Joost |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_884623 |
| institution | PANGAEA |
| language | en |
| publishDate | 2018 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Glacial Mediterranean Outflow recoinstruction at IODP Site 339-U1390 van Dijk, Joep Ziegler, Martin de Nooijer, Lennart Jan Reichart, Gert-Jan Xuan, Chuang Ducassou, Emmanuelle Bernasconi, Stefano M Lourens, Lucas Joost Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP 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. |
| title | Glacial Mediterranean Outflow recoinstruction at IODP Site 339-U1390 |
| topic | Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP |
| url | https://doi.org/10.1594/PANGAEA.884623 |