Late glacial and Holocene glaciation history of North and Northeast Greenland
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Standard
Late glacial and Holocene glaciation history of North and Northeast Greenland. / Larsen, Nicolaj K.; Sondergaard, Anne Sofie; Levy, Laura B.; Strunk, Astrid; Skov, Daniel S.; Bjørk, Anders; Khan, Shfaqat A.; Olsen, Jesper.
I: Arctic, Antarctic, and Alpine Research, Bind 54, Nr. 1, 2022, s. 294-313.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Late glacial and Holocene glaciation history of North and Northeast Greenland
AU - Larsen, Nicolaj K.
AU - Sondergaard, Anne Sofie
AU - Levy, Laura B.
AU - Strunk, Astrid
AU - Skov, Daniel S.
AU - Bjørk, Anders
AU - Khan, Shfaqat A.
AU - Olsen, Jesper
PY - 2022
Y1 - 2022
N2 - Northeast Greenland is the place where the Greenland Ice Sheet (GrIS) experienced the largest areal changes since the Last Glacial Maximum. However, the age constraints of the last deglaciation are in some areas sparse. In this study, we use forty-seven new Be-10 cosmogenic exposure ages to constrain the deglaciation of the present-day ice-free areas in Northeast Greenland. Our results show that the outer coast region was deglaciated between 12.8 +/- 0.6 and 11.5 +/- 0.2 ka and the region close to the present ice margin was deglaciated 2 to 4 ka later between 9.2 +/- 0.3 to 8.6 +/- 0.3 ka. By combining our new results with previously published data from North and Northeast Greenland, we find that the ice sheet advanced to the shelf edge between 26 and 20 cal. ka BP. The outer coast was deglaciated between 12.8 and 9.7 ka and the present ice extent was reached between 10.8 to 5.8 ka. The ice margin continued to retreat farther inland during the Middle Holocene before it readvanced toward its Little Ice Age position. The deglaciation was probably forced by a combination of increased atmospheric and ocean temperatures, but local topography also played an important role. These results add to the growing knowledge about the glaciation history of the GrIS and add useful constraints for future ice sheet models.
AB - Northeast Greenland is the place where the Greenland Ice Sheet (GrIS) experienced the largest areal changes since the Last Glacial Maximum. However, the age constraints of the last deglaciation are in some areas sparse. In this study, we use forty-seven new Be-10 cosmogenic exposure ages to constrain the deglaciation of the present-day ice-free areas in Northeast Greenland. Our results show that the outer coast region was deglaciated between 12.8 +/- 0.6 and 11.5 +/- 0.2 ka and the region close to the present ice margin was deglaciated 2 to 4 ka later between 9.2 +/- 0.3 to 8.6 +/- 0.3 ka. By combining our new results with previously published data from North and Northeast Greenland, we find that the ice sheet advanced to the shelf edge between 26 and 20 cal. ka BP. The outer coast was deglaciated between 12.8 and 9.7 ka and the present ice extent was reached between 10.8 to 5.8 ka. The ice margin continued to retreat farther inland during the Middle Holocene before it readvanced toward its Little Ice Age position. The deglaciation was probably forced by a combination of increased atmospheric and ocean temperatures, but local topography also played an important role. These results add to the growing knowledge about the glaciation history of the GrIS and add useful constraints for future ice sheet models.
KW - Greenland Ice Sheet
KW - cosmogenic exposure dating
KW - deglaciation
KW - LATE QUATERNARY HISTORY
KW - CENTRAL EAST GREENLAND
KW - RELATIVE SEA-LEVEL
KW - ICE-SHEET
KW - STORE-KOLDEWEY
KW - SCORESBY SUND
KW - JAMESON LAND
KW - ENVIRONMENTAL HISTORY
KW - BE-10 CHRONOLOGY
KW - LATE PLEISTOCENE
U2 - 10.1080/15230430.2022.2094607
DO - 10.1080/15230430.2022.2094607
M3 - Journal article
VL - 54
SP - 294
EP - 313
JO - Arctic, Antarctic, and Alpine Research
JF - Arctic, Antarctic, and Alpine Research
SN - 1523-0430
IS - 1
ER -
ID: 317435143