Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
doi:10.5194/cp-2017-13
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 Feb 2017
Review status
This discussion paper is under review for the journal Climate of the Past (CP).
Mediterranean Outflow Water variability during the Early Pleistocene climate transition
Stefanie Kaboth1, Patrick Grunert2, and Lucas J. Lourens1 1Department of Earth Sciences, Faculty of Geosciences, Utrecht University, Heidelberglaan 2, 3584 CS, Utrecht, The Netherlands
2Institute of Earth Sciences, University of Graz, NAWI Graz, Heinrichstra├če 26, 8010 Graz, Austria
Abstract. Gaining insights into the evolution of Mediterranean Outflow Water (MOW) during the Early Pleistocene climate transition has been so far hampered by the lack of available paleoclimatic archives. Here we present the first benthic foraminifera stable oxygen and carbon isotope records and grain-size data from IODP Expedition 339 Site U1389 presently located within the upper core of the MOW in the Gulf of Cadiz for the time interval between 2.6 and 1.8 Ma. A comparison with an intermediate water mass record from the Mediterranean Sea strongly suggest an active MOW supplying Site U1389 on glacial-interglacial timescales during the Early Pleistocene. We also find indication that the increasing presence of MOW in the Gulf of Cadiz during the investigated time interval aligns with the progressive northward protrusion of Mediterranean sourced intermediate water masses into the North Atlantic, possibly modulating the intensification of the North Atlantic Meridional Overturning Circulation at the same time. Additionally, our results suggest that MOW flow strength was already governed by precession and semi-precession cyclicity during the Early Pleistocene against the background of glacial-interglacial variability dominated by the obliquity cycle of Earth`s inclination axis.

Citation: Kaboth, S., Grunert, P., and Lourens, L. J.: Mediterranean Outflow Water variability during the Early Pleistocene climate transition, Clim. Past Discuss., doi:10.5194/cp-2017-13, in review, 2017.
Stefanie Kaboth et al.
Stefanie Kaboth et al.
Stefanie Kaboth et al.

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Short summary
This study is devoted to reconstruct Mediterranean outflow water (MOW) variability, and the interplay between the Mediterranean and North Atlantic climate systems during the Early Pleistocene. We find indication that the increasing production of MOW aligns with the intensification of the North Atlantic overturning circulation, highlighting the potential of MOW to modulate the North Atlantic salt budget. Our results are based on new stable isotope and grain-size data from IODP 339 Site U1389.
This study is devoted to reconstruct Mediterranean outflow water (MOW) variability, and the...
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