Mediterranean Outflow Water variability during the early Pleistocene

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doi: 10.5194/cp-13-1023-2017
Author(s): Kaboth, Stefanie; Grunert, Patrick; Lourens, Lucas
Author Affiliation(s): Primary:
National Taiwan University, Department of Earth Sciences, Taipei City, Taiwan
Other:
Utrecht University, Netherlands
University of Graz, Austria
Volume Title: Climate of the Past
Source: Climate of the Past, 13(8), p.1023-1035. Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1814-9324
Note: In English. 79 refs.; illus., incl. 2 tables, sketch maps
Summary: Gaining insights into the evolution of Mediterranean Outflow Water (MOW) during the Early Pleistocene has been so far hampered by the lack of available palaeoclimatic 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.
Year of Publication: 2017
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 24 Surficial Geology, Quaternary Geology; Age; Atlantic Meridional Overturning Circulation; Atlantic Ocean; Benthic taxa; Biostratigraphy; C-13/C-12; Carbon; Cenozoic; Chronology; Climate change; Controls; Corrections; Cyclic processes; Expedition 339; Foraminifera; Glacial environment; Grain size; Granulometry; Gulf of Cadiz; IODP Site U1389; Integrated Ocean Drilling Program; Interglacial environment; Isotope ratios; Isotopes; Lower Pleistocene; Measurement; Mediterranean Outflow Water; Microfossils; North Atlantic; O-18/O-16; Ocean circulation; Oxygen; Paleoclimatology; Paleomagnetism; Pleistocene; Precession; Quaternary; Sedimentation; Sedimentation rates; Spectra; Stable isotopes; Upper Pleistocene; Variations
Coordinates: N362530 N362531 W0071641 W0071641
Record ID: 2017103742
Copyright Information: GeoRef, Copyright 2018 American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany