TY - JOUR
T1 - Southwest Greenland shelf glaciation during MIS 4 more extensive than during the Last Glacial Maximum
AU - Seidenkrantz, Marit-Solveig
AU - Kuijpers, Antoon
AU - Olsen, Jesper
AU - Pearce, Christof
AU - Lindblom, Sofia
AU - Ploug, Johan
AU - Przybylo, Piotr
AU - Snowball, Ian
N1 - Funding Information:
The authors highly acknowledge the UNESCO-supported, international ‘Training-Through-Research’ (TTR) programme and the Geological Survey of Denmark and Greenland (GEUS) for funding the collection of the cores during the TTR-13 cruise campaign of RV ‘Prof. Logachev’. The ship’s crew and TTR scientific party headed by the late Mikael Ivanov, Moscow State University, are sincerely thanked for their engagement while being at sea. XRF core scanning was carried out at the Royal Netherlands Institute for Sea Research, Texel, NL and Rineke Gieles is thanked for her valuable help. Isotope analyses were carried out at the Woods Hole Oceanographic Institution and we are very grateful to Delia Oppo for providing this valuable service. Sediment core laboratory analyses were financially supported by various grants from the Danish Natural Science Research Council received by A.K. and M.-S.S. since 2003, most recently the Independent Research Fund Denmark/Natural Science project G-Ice (project no 7014–00113B).
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - Although geological and modelling evidence indicate that the last glacial inception in North America was in NE Canada, little is known about the glacial response of the nearby western Greenland Ice Sheet (GIS) during the glacial advance of marine oxygen isotope stage 4 (MIS4). Our multi-proxy study of a marine sediment core collected about 60 km southwest of the Outer Hellefisk Moraines demonstrates that in the southern Davis Strait region the most extreme Greenland shelf glaciation of the last glacial cycle occurred during MIS 4, with another prominent glacial advance at 37–33 kyr BP. During those periods the GIS likely reached the Outer Hellefisk Moraines in this area. Except for these two periods, our data suggest significant advection of relatively warm Irminger Sea Water by the West Greenland Current since MIS 4. This advection likely limited the extent of the MIS2 glaciation on the SW Greenland shelf. Decreased precipitation over southwestern Greenland predicted by atmospheric models as a downstream effect of a much larger MIS2 Laurentide Ice Sheet may have played an additional role.
AB - Although geological and modelling evidence indicate that the last glacial inception in North America was in NE Canada, little is known about the glacial response of the nearby western Greenland Ice Sheet (GIS) during the glacial advance of marine oxygen isotope stage 4 (MIS4). Our multi-proxy study of a marine sediment core collected about 60 km southwest of the Outer Hellefisk Moraines demonstrates that in the southern Davis Strait region the most extreme Greenland shelf glaciation of the last glacial cycle occurred during MIS 4, with another prominent glacial advance at 37–33 kyr BP. During those periods the GIS likely reached the Outer Hellefisk Moraines in this area. Except for these two periods, our data suggest significant advection of relatively warm Irminger Sea Water by the West Greenland Current since MIS 4. This advection likely limited the extent of the MIS2 glaciation on the SW Greenland shelf. Decreased precipitation over southwestern Greenland predicted by atmospheric models as a downstream effect of a much larger MIS2 Laurentide Ice Sheet may have played an additional role.
UR - http://www.scopus.com/inward/record.url?scp=85074287474&partnerID=8YFLogxK
U2 - 10.1038/s41598-019-51983-3
DO - 10.1038/s41598-019-51983-3
M3 - Article
SN - 2045-2322
VL - 9
JO - Scientific Reports
JF - Scientific Reports
M1 - 15617
ER -
