14 C‐dated fluctuations of the western flank of the Scandinavian Ice Sheet 45–25 kyr BP compared with Bølling–Younger Dryas fluctuations and Dansgaard–Oeschger events in Greenland

• Published in: Boreas
• Main Authors: MANGERUD, JAN, GULLIKSEN, STEINAR, LARSEN, EILIV
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2010
• Subjects: Austnes; Boreas; Greenland; Norway; Dansgaard-Oeschger events; Greenland ice core; ice core; Ice Sheet; NGRIP
• Online Access: http://dx.doi.org/10.1111/j.1502-3885.2009.00127.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.2009.00127.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.2009.00127.x

Mangerud, J., Gulliksen, S. & Larsen, E. 2009: 14 C‐dated fluctuations of the western flank of the Scandinavian Ice Sheet 45–25 kyr BP compared with Bølling–Younger Dryas fluctuations and Dansgaard–Oeschger events in Greenland. Boreas , 10.1111/j.1502‐3885.2009.00127.x. ISSN 0300‐9483. We present 32 accelerator mass spectrometry (AMS) 14 C dates obtained on well‐preserved bones from caves in western Norway. The resulting ages of 34–28 14 C kyr BP demonstrate that the coast was ice‐free during the so‐called Ålesund Interstadial. New AMS 14 C dates on shells aged 41–38 14 C kyr BP are evidence of an earlier (Austnes) ice‐free period. The Ålesund Interstadial correlates with Greenland interstadials 8–7 and the Austnes Interstadial with Greenland interstadials 12–11. Between and after the two interstadials, the ice margin reached onto the continental shelf west of Norway. These events can be closely correlated with the Greenland ice core stratigraphy, partly based on identification of the Laschamp and Mono Lake palaeomagnetic excursions. We found that the pattern of the NGRIP δ 18 O curves for the two periods Greenland Interstadial (GI) 8 to Greenland Stadial (GS) 8 and GI 1–GS 1 (Bølling–Younger Dryas) were strikingly similar, which leads us to suggest that the underlying causes of these climate shifts could have been the same. We therefore discuss some aspects of glacial fluctuations during the Bølling–Younger Dryas in order to elucidate processes during Dansgaard–Oeschger events.