Glacier fluctuations during the Late Glacial and Holocene on the Ariège valley, northern slope of the Pyrenees and reconstructed climatic conditions

Jomelli, Vincent; Chapron, Emmanuel; Favier, Vincent; Rinterknecht, Vincent; Braucher, Régis; Tournier, Nicolas; Gascoin, Simon; Marti, Renaud; Galop, Didier; Binet, Stéphane; Deschamps-Berger, Cesar; Tissoux, Helene; Aumaitre, Georges; Bourlès, Didier L.; Keddadouche, Karim (2020). Glacier fluctuations during the Late Glacial and Holocene on the Ariège valley, northern slope of the Pyrenees and reconstructed climatic conditions. Mediterranean Geoscience Reviews, 2(1), pp. 37-51. 10.1007/s42990-020-00018-5

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The glacier evolution from two valleys located near Vicdessos, French Pyrenees, is deciphered from 17 in situ cosmic ray exposure (CRE) dating. In the Picot valley, Late Glacial glacier advances were documented during Heinrich Stadial 1 (HS1), while a rock glacier developed or was reactivated during the mid-Holocene. In the upper Médécourbe valley, the largest visible ice extent occurred during the Younger Dryas (YD) or earlier. At least two moraines formed during the early Holocene were dated, while an undated moraine located close to the head of the catchment may have been formed either during the Late Holocene or the Little Ice Age. A mass balance model suggests that a temperature about 5.1 °C cooler than today, without precipitation change, would be necessary to form a moraine at the base of the Picot catchment during HS1 at 2000 m a.s.l. A temperature about 3.9 °C cooler than today is necessary to explain a moraine formed during the Late Glacial–YD transition at Médécourbe at 2200 m. Comparing CRE dating from Picot and Médécourbe with those in the Pyrenees and the Alps highlights original glacial patterns. In the Picot catchment whose summit is below the current regional ELA, the absence of YD and Late Holocene moraines is consistent with the general low-altitude deglaciation trend documented in the northern and southern slope of the Pyrenees, but differs from high-altitude Pyrenean and Alpine records. However, due to specific geomorphological conditions, the glacial evolution of the Médécourbe valley took place differently compared to other low-altitude catchments in the Pyrenees.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Quaternary Geology

UniBE Contributor:

Tournier, Nicolas Michel Bruno

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

2661-863X

Language:

English

Submitter:

Nicolas Michel Bruno Tournier

Date Deposited:

03 Mar 2021 16:18

Last Modified:

03 Mar 2021 16:35

Publisher DOI:

10.1007/s42990-020-00018-5

BORIS DOI:

10.48350/152727

URI:

https://boris.unibe.ch/id/eprint/152727

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