期刊
QUATERNARY SCIENCE REVIEWS
卷 255, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2021.106815
关键词
Glacial geomorphology; Paleoclimatology; ELA; Surface Exposure Dating; Cosmogenic Be-10; Late Pleistocene; Younger Dryas; Western Alps
资金
- University of Pisa [PRA-2020_60]
- University of Pisa
The study conducted a detailed reconstruction of glacier advances in the Gran Paradiso group in the Western Alps of Italy during the Egesen stadial, indicating that the relatively drier conditions in the area postdate the Last Glacial Maximum (LGM) and were already present during the Egesen stadial. The results support a strong positive Younger Dryas Arctic Oscillation index, leading to drier conditions in southern Europe.
The Late Pleistocene to Holocene transition in the Northern Hemisphere was characterized by abrupt millennial-scale climatic changes testified in the Alpine Chain by proxy records derived from glacial landforms and deposits. A detailed reconstruction of the paleo-glaciers during the deposition of the pre-Little Ice Age (LIA) moraines and newly obtained Be-10 exposure ages provide information on the timing of a glacier advance in the Gran Paradiso Group (Western Alps, Italy) related to the regional Egesen stadial as a response to the climatic deterioration at around 12.9-11.7 Ica (corresponding to the Younger Dryas in northern Europe and to the Greenland stadial 1 in the INTIMATE event stratigraphy). The study area represents a key site to define the behaviour of the Egesen paleo-glaciers, since they are located in a significant climatic area between the moister Maritime Alps and the Northern Alps. The ELA reconstructions and the comparison with other Alpine sectors provide evidence that current relatively drier conditions in the area postdate the LGM and were already present during the Egesen stadial. Our results support a strong positive YD Arctic Oscillation index, which led to drier conditions in southern Europe and caused negative winter precipitation anomalies. (C) 2021 The Author(s). Published by Elsevier Ltd.
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