Le 7Be: une aide à l'estimation des précipitations annuelles sur les glaciers froids

Pourchet, M.; Debonnet, Elise; Preiss, Nicolas; Vincent, Christian

doi:10.1016/s1251-8050(99)80041-x

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…For both profiles, atmospheric 210 Pb fluxes as derived from the initial activity A 0 (Comedero 125 Bq m À2 yr À1 ; Rodeo 137.1 Bq m À2 yr À1 ) and total unsupported 210 Pb activity (Rodeo 4410 Bq m À2 ; Comedero 4010 Bq m À2 ) are comparable and similar to results found in adjacent Bolivia (Pourchet et al, 1995). Bioturbation might play a role in both lakes since no 7 Be (half-life time of 53.3 days) could be detected in the top sediments, and a plateau of unsupported 210 Pb was found in the uppermost three samples of Laguna Comedero (cumulative dry mass 0.22 g cm À2 ).…”

Section: Resultssupporting

confidence: 79%

Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Lupo

Bianchi

Aráoz³

et al. 2006

Quaternary International

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Section: Resultssupporting

confidence: 79%

Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Lupo

Bianchi

Aráoz³

et al. 2006

Quaternary International

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“…The flow of the MBM glaciers has been the subject of numerous in situ or remotely sensed velocity measurements (e.g. Gagliardini and Meyssonnier, 1997; Berthier and others, 2005; Fallourd and others, 2011) in order to better characterize the dynamics of warm- and cold-based glaciers (Pourchet and others, 1998; Suter and Hoelzle, 2002), with particular emphasis on hazard assessment (e.g. Le Meur and Vincent, 2006; Margreth and others, 2011; Dematteis and others, 2021).…”

Section: Study Area: the Mont-blanc Massifmentioning

confidence: 99%

Ice aprons on steep high-alpine slopes: insights from the Mont-Blanc massif, Western Alps

et al. 2023

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Ice aprons are defined as very small ice bodies covering steep rock slopes. They have only been the subject of increased scientific interest for a few years, despite the fact that they are a condition for mountaineering and obvious elements in the high-alpine landscapes. However, very little is known about their distribution, evolution and physical characteristics. In this paper, we review the existing knowledge on ice aprons, which have almost exclusively been investigated in the Mont-Blanc massif, Western Alps. We supplement this review with novel results from recent surveys of ice aprons. We used a wide array of methodologies, from remote sensing (multi-source imagery) to in situ (stakes and thermal monitoring) and laboratory (radiocarbon dating and texture analysis) glaciological investigations. In the Mont-Blanc massif, ice aprons occupy 4.2 km2 within the alpine permafrost zone. Temperature measured at the ice–rock interface is indeed largely negative. Thinness of ice aprons coupled with the cold context implies a quasi-stationary shear regime without basal Sliding. Only ice at the surface can possibly melt in warm periods. After a shrinking period from the end of the Little Ice Age to the mid-to-late-1960s, ice aprons experienced a short period of expansion, followed by an accelerated shrinkage since the beginning of the 21st century. This shrinkage now favours rockfall triggering and poses a serious threat to a glaciological heritage since ice aprons host several-thousand-year-old ice. Finally, we synthesize this information to assess the existing definition of ice aprons, and propose some future research directions.

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Lead-210 and radon-222 anomalies in Mont Blanc snow, French Alps

Pourchet

Richon

Sabroux

2000

Journal of Environmental Radioactivity

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Le 7Be: une aide à l'estimation des précipitations annuelles sur les glaciers froids

Cited by 3 publications

References 9 publications

Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Climate and human impact during the past 2000 years as recorded in the Lagunas de Yala, Jujuy, northwestern Argentina

Ice aprons on steep high-alpine slopes: insights from the Mont-Blanc massif, Western Alps

Lead-210 and radon-222 anomalies in Mont Blanc snow, French Alps

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