Pollen and oxygen isotope analyses on late- and post-glacial sediments of the Tourbière de Chirens (Dauphiné, France)期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Pollen and oxygen isotope analyses on late- and post-glacial sediments of the Tourbière de Chirens (Dauphiné, France)

Authors:	U Eicher U Siegenthaler S Wegmüller

Institution:	Physikalisches Institut, Universität Bern, Bern, Switzerland;Systematisch-Geobotanisches Institut, Universität Bern, Bern, Switzerland

Abstract:	The sequence of vegetation phases in the late Glacial was studied in a sediment section from the bog Tourbière de Chirens by means of pollen analysis. $^{18} O^{16} O$ ratios of samples of lacustrine marl, obtained from the same profile, reflect variations of $^{18} O^{16} O$ in precipitation and thus provide an additional, independent paleoclimatic record. The observed $^{18} O^{16} O$ variations agree well with the climatic history as deduced from pollen analysis. The climatic transition from the Oldest Dryas to the Bølling period sensu lato, as well as the beginning and end of the Younger Dryas cold phase, is marked by abrupt changes in the $^{18} O^{16} O$ ratio which were observed also in other regions of the Alps. These drastic climatic changes probably took place simultaneously over large areas of Central Europe and occurred within short time spans.

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