Kaboth, Stefanie; Bahr, André; Reichart, Gert-Jan; Jacobs, Bram; Lourens, Lucas Joost (2017): (Table 2) Age control points from IODP Site 339-U1386 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.870577, Supplement to: Kaboth, S et al. (2016): New insights into upper MOW variability over the last 150kyr from IODP 339 Site U1386 in the Gulf of Cadiz. Marine Geology, 377, 136-145, https://doi.org/10.1016/j.margeo.2015.08.014
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Published: 2017-01-10 • DOI registered: 2017-02-07
Abstract:
The upper Mediterranean Outflow Water (MOW) paleo-oceanographic history in the Gulf of Cadiz is poorly constrained due to the lack of high-resolution records that pre-date the last glaciation. Existing proxy records concentrate on MOW variability along the middle slope of the Gulf of Cadiz. Here we present a continuous high-resolution benthic foraminifera d18O record from the upper MOW core at IODP Expedition 339 Site U1386 in the Gulf of Cadiz of the past 150000 years. Based on d18O, grain-size and Zr/Al variability comparison of our results with existing Mediterranean Sea (MD01-2472, MD95-2043), open ocean (LR04) and Gulf of Cadiz (MD99-2339) records we have gathered new insights into the evolution of the upper MOW core on glacial-interglacial timescales. The influence of the upper MOW at Site U1386 was strongest during MIS 5 and MIS 1. Similar d18O variability can be seen in the Levantine IntermediateWater (LIW) originating from the Levantine Basin of the Eastern Mediterranean Sea. We found clear indication for a vertical shift of the MOW from the upper to the middle slope of the Gulf of Cadiz during sea level lowstands coinciding with MIS 4 and MIS 2 but also during MIS 3. Additionally, our results indicate an increased upper MOW flow correlated with Heinrich Events 7 to 10 and the Younger Dryas, and also inversely relate to precession-forced monsoonal freshwater inputs into the Eastern Mediterranean. In the context of Sapropel formation,we could not find conclusive evidence of the proposed MOW shutdown in our data.
Related to:
Barker, Stephen; Knorr, Gregor; Edwards, R Lawrence; Parrenin, Frédéric; Putnam, Aaron E; Skinner, Luke C; Wolff, Eric William; Ziegler, Martin (2011): 800,000 Years of abrupt climate variability. Science, 334(6054), 347-351, https://doi.org/10.1126/science.1203580
Hodell, David A; Crowhurst, Simon J; Skinner, Luke C; Tzedakis, Polychronis C; Margari, Vasiliki; Channell, James E T; Kamenov, George D; Maclachlan, Suzanne; Rothwell, Robin Guy (2013): Response of Iberian Margin sediments to orbital and suborbital forcing over the past 420 ka. Paleoceanography, 28(1), 185-199, https://doi.org/10.1002/palo.20017
Project(s):
Coverage:
Latitude: 36.828000 * Longitude: -7.755000
Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 48.05 m
Event(s):
339-U1386 * Latitude: 36.828000 * Longitude: -7.755000 * Elevation: -561.0 m * Campaign: Exp339 (Mediterranean Outflow) * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)
Comment:
Age control points used for the construction of the chronology at Site U1386 based on the tuning of normalized bromine (Br) (Br/total counts) at IODP Site 339-U1386 derived from XRF scanning to the planktonic G. bulloides d18O record from core MD01-2444 (Barker et al., 2011; Hodell et al., 2013).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Kaboth, Stefanie | Geocode – mcd | |
| 2 | Age model | Age model | ka | Kaboth, Stefanie | Age model, stable isotope stratigraphy |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
36 data points