Mediterranean outflow water variability during the early Pleistocene climate transition

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http://meetingorganizer.copernicus.org/EGU2017/EGU2017-5149.pdf
Author(s): Kaboth, Stefanie; Grunert, Patrick; Lourens, Lucas J.
Author Affiliation(s): Primary:
Utrecht University, Utrecht, Netherlands
Other:
University of Graz, Austria
Volume Title: European Geosciences Union general assembly 2017
Source: Geophysical Research Abstracts, Vol.19; European Geosciences Union general assembly 2017, Vienna, Austria, April 23-28, 2017. Publisher: Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau, Germany. ISSN: 1029-7006
Note: In English
Summary: 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. [Copyright Author(s) 2017. CC Attribution 3.0 License: https://creativecommons.org/licenses/by/3.0/legalcode]
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Atlantic Ocean; Cenozoic; Currents; Expedition 339; IODP Site U1389; Integrated Ocean Drilling Program; Lower Pleistocene; Mediterranean Sea; Mediterranean region; North Atlantic; Ocean circulation; Ocean currents; Pleistocene; Quaternary
Coordinates: N362530 N362531 W0071641 W0071641
Record ID: 2018031398
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from European Geosciences Union, Munich, Germany