The Alpine LGM in the boreal ice-sheets game

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 sy...

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Autores principales:	Giovanni Monegato, Giancarlo Scardia, Irka Hajdas, Francesca Rizzini, Andrea Piccin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/fcfe43195f7d474fb74c12c2f87662e2
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spelling	oai:doaj.org-article:fcfe43195f7d474fb74c12c2f87662e22021-12-02T12:32:29ZThe Alpine LGM in the boreal ice-sheets game10.1038/s41598-017-02148-72045-2322https://doaj.org/article/fcfe43195f7d474fb74c12c2f87662e22017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02148-7https://doaj.org/toc/2045-2322Abstract 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 after 22 ka and faded out after 17.5 ka.Giovanni MonegatoGiancarlo ScardiaIrka HajdasFrancesca RizziniAndrea PiccinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Giovanni Monegato Giancarlo Scardia Irka Hajdas Francesca Rizzini Andrea Piccin The Alpine LGM in the boreal ice-sheets game
description	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 after 22 ka and faded out after 17.5 ka.
format	article
author	Giovanni Monegato Giancarlo Scardia Irka Hajdas Francesca Rizzini Andrea Piccin
author_facet	Giovanni Monegato Giancarlo Scardia Irka Hajdas Francesca Rizzini Andrea Piccin
author_sort	Giovanni Monegato
title	The Alpine LGM in the boreal ice-sheets game
title_short	The Alpine LGM in the boreal ice-sheets game
title_full	The Alpine LGM in the boreal ice-sheets game
title_fullStr	The Alpine LGM in the boreal ice-sheets game
title_full_unstemmed	The Alpine LGM in the boreal ice-sheets game
title_sort	alpine lgm in the boreal ice-sheets game
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/fcfe43195f7d474fb74c12c2f87662e2
work_keys_str_mv	AT giovannimonegato thealpinelgmintheborealicesheetsgame AT giancarloscardia thealpinelgmintheborealicesheetsgame AT irkahajdas thealpinelgmintheborealicesheetsgame AT francescarizzini thealpinelgmintheborealicesheetsgame AT andreapiccin thealpinelgmintheborealicesheetsgame AT giovannimonegato alpinelgmintheborealicesheetsgame AT giancarloscardia alpinelgmintheborealicesheetsgame AT irkahajdas alpinelgmintheborealicesheetsgame AT francescarizzini alpinelgmintheborealicesheetsgame AT andreapiccin alpinelgmintheborealicesheetsgame
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The Alpine LGM in the boreal ice-sheets game

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