The Alpine LGM in the boreal ice-sheets game

Scientific Reports
Giovanni MonegatoAndrea Piccin

Abstract

New chronologic and stratigraphic constraints from the Garda morainic amphitheater define the extension of the last glaciation in the Adige-Sarca system and improve the Alpine LGM dataset. Together with the available chronology of the Rhine and Tagliamento systems, our results indicate a synchronous maximum culmination of Alpine glaciers during the LGM, which anticipated by about 3.5 ka the maximum extension of the Eurasian Ice Sheet (EIS). This is ascribed to the sensitivity of Alpine glaciers to the availability of moisture from southerly circulation, as recently documented by speleothem δ18O curve from Sieben Hengste (7 H). According to global circulation models, the waxing of the North American Ice Sheet (NAIS) at 26-23 ka pushed the North Atlantic jet stream southwards. This enhanced precipitation rates in southern Europe by advection of moisture from the Mediterranean Sea, triggering expansion of the Alpine glaciers. NAIS waning after 23 ka led to the gradual re-establishment of westerly circulation and renewal of a moisture supply to northern Europe, feeding the EIS to its maximum volume. Reduced supply of moisture from the Mediterranean Sea sealed the fate of the Alpine glaciers, which entered a final recessional phase ...Continue Reading

References

Aug 8, 2009·Science·Peter U ClarkA Marshall McCabe
Oct 15, 2014·Proceedings of the National Academy of Sciences of the United States of America·Kurt LambeckMalcolm Sambridge

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Citations

Aug 17, 2019·Scientific Reports·Joscha GretzingerVerena J Schuenemann
Sep 12, 2020·American Journal of Physical Anthropology·Gregorio OxiliaEmanuela Cristiani
Oct 24, 2020·Scientific Reports·Federica BadinoStefano Benazzi
Apr 23, 2021·Current Biology : CB·Eugenio BortoliniStefano Benazzi

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