10.1594/PANGAEA.882374
Bahr, André
André
Bahr
Kaboth, Stefanie
Stefanie
Kaboth
0000-0002-4449-2938
Hodell, David A
David A
Hodell
0000-0001-8537-1588
Zeeden, Christian
Christian
Zeeden
0000-0002-8617-0443
Fiebig, Jens
Jens
Fiebig
Friedrich, Oliver
Oliver
Friedrich
0000-0002-6046-7513
Temperature reconstruction for the Mid-Pleistocene Transition based on deep-dwelling foraminifera of IODP Site339-U1385
PANGAEA
2017
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
2011-11-25T00:00:00
en
Supplementary Publication Series of Datasets
10.1016/j.quascirev.2017.11.009
4 datasets
application/zip
Creative Commons Attribution 3.0 Unported
The mid-Pleistocene Transition (MPT; approx. 1.2-0.7 Ma), is characterized by growing Northern Hemisphere ice sheets and the shift from a 41 kyr to a 100 kyr glacial-interglacial cyclicity. Concomitant to the growth of large ice sheets, atmospheric and oceanic circulation pattern have changed. One key feature of the North Atlantic is the wind-driven Subtropical Gyre, a major provider of heat and moisture for continental Europe. Here, we investigate changes in the strength and spatial configuration of the Subtropical Gyre during the MPT and its impact on the continental moisture balance.
To reconstruct Subtropical Gyre dynamics, we conducted conducted paired d18O and Mg/Ca analyses on the deep-dwelling foraminifera Globorotalia inflata from Iberian Margin Site U1385 yielding thermocline temperature (Ttherm) variability between 1400-500 ka at the eastern boundary of the Subtropical Gyre.
Long-term trends of Ttherm at Site U1385 oppose the North Atlantic climatic evolution of progressively intensified glacials during the MPT. Particularly, glacials MIS 20 and 18 were marked by warm thermocline waters off Iberia. We infer that a southward shift of the (sub)polar front displaced the source region of thermocline waters within the Subtropical Gyre from high to mid-latitudes. In addition, a strong Mediterranean Outflow Water production during the MPT caused the advection of warm waters to Iberia. Humid conditions during MIS 20 and 18 in SE Europe indicate that atmospheric moisture derived from this warm water might have been advected deep into continental Europe and contributed to enhanced growth of Alpine glaciers.
Supplement to: Bahr, André; Kaboth, Stefanie; Hodell, David A; Zeeden, Christian; Fiebig, Jens; Friedrich, Oliver (2018): Oceanic heat pulses fueling moisture transport towards continental Europe across the mid-Pleistocene transition. Quaternary Science Reviews, 179, 48-58
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