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Author Cartier, Rosine ♦ Sylvestre, Florence ♦ Paillès, Christine ♦ Sonzogni, Corinne ♦ Couapel, Martine ♦ Alexandre, Anne M. ♦ Mazur, Jean-Charles ♦ Brisset, Elodie ♦ Miramont, Cécile ♦ Guiter, Frédéric
Source Hyper Articles en Ligne (HAL)
Content type Text
Publisher European Geosciences Union (EGU)
File Format PDF
Language English
Subject Keyword sdu ♦ Sciences of the Universe [physics]/Earth Sciences/Climatology ♦ Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Abstract In the Mediterranean area, the 4.2 ka BP event is recorded with contrasting expressions between regions. In the southern Alps, the high-altitude Lake Petit (Mercantour Massif, France; 2200 m a.s.l.) offers pollen and diatom-rich sediments covering the last 4800 years. A multi-proxy analysis recently revealed a detrital pulse around 4200 cal BP due to increasing erosion in the lake catchment. The involvement of a rapid climate change leading to increasing runoff and soil erosion was proposed. Here, in order to clarify this hypothesis , we measured the oxygen isotope composition of diatom silica frustules (δ 18 O diatom) from the same sedimen-tary core. Diatoms were analysed by laser fluorination isotope ratio mass spectrometry after an inert gas flow dehydration. We additionally enhanced the accuracy of the age-depth model using the Bacon R package. The δ 18 O diatom record allows us to identify a 500-year time lapse, from 4400 to 3900 cal BP, where δ 18 O diatom reached its highest values (> 31 ‰). δ 18 O diatom was about 3 ‰ higher than the modern values and the shifts at 4400 and 3900 cal BP were of similar amplitude as the seasonal δ 18 O diatom shifts occurring today. This period of high δ 18 O diatom values can be explained by the intensification of 18 O-enriched Mediterranean precipitation events feeding the lake during the ice-free season. This agrees with other records from the southern Alps suggesting runoff intensification around 4200 cal BP. Possible changes in other climatic parameters may have played a concomi-tant role, including a decrease in the contribution of 18 O-depleted Atlantic winter precipitation to the lake water due to snow deficit. Data recording the 4.2 ka BP event in the northwestern Mediterranean area are still sparse. In the Lake Pe-tit watershed, the 4.2 ka BP event translated into a change in precipitation regime from 4400 to 3900 cal BP. This record contributes to the recent efforts to characterize and investigate the geographical extent of the 4.2 ka BP event in the Mediterranean area.
ISSN 18149324
Educational Use Research
Learning Resource Type Article
Publisher Date 2019-01-01
e-ISSN 18149332
Journal Climate of the Past
Volume Number 15
Issue Number 1
Page Count 11
Starting Page 253
Ending Page 263