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Article Dans Une Revue Climate of the Past Année : 2009

Terrestrial climate variability and seasonality changes in the Mediterranean region between 15,000 and 4,000 years B.P. deduced from marine pollen records

Résumé

Pollen-based climate reconstructions were performed on two high-resolution pollen marines cores from the Alboran and Aegean Seas in order to unravel the climatic variability in the coastal settings of the Mediterranean region between 15 000 and 4000 years BP (the Lateglacial, and early to mid-Holocene). The quantitative climate reconstructions for the Alboran and Aegean Sea records focus mainly on the reconstruction of the seasonality changes (tempera-tures and precipitation), a crucial parameter in the Mediter-ranean region. This study is based on a multi-method approach comprising 3 methods: the Modern Analogues Technique (MAT), the recent Non-Metric Multidimensional Scal-ing/Generalized Additive Model method (NMDS/GAM) and Partial Least Squares regression (PLS). The climate signal inferred from this comparative approach confirms that cold and dry conditions prevailed in the Mediterranean region during the Oldest and Younger Dryas periods, while temperate conditions prevailed during the Bølling/Allerød and the Holocene. Our records suggest a West/East gradient of decreasing precipitation across the Mediterranean region during the cooler Late-glacial and early Holocene periods, similar to present-day conditions. Winter precipitation was highest during warm intervals and lowest during cooling phases. Several short-lived cool intervals (i.e. Older Dryas, another oscillation after this one (GI-1c2), Gerzensee/Preboreal Correspondence to: I. Dormoy (isabelle.dormoy@univ-fcomte.fr) Oscillations, 8.2 ka event, Bond events) connected to the North Atlantic climate system are documented in the Albo-ran and Aegean Sea records indicating that the climate oscillations associated with the successive steps of the deglacia-tion in the North Atlantic area occurred in both the western and eastern Mediterranean regions. This observation confirms the presence of strong climatic linkages between the North Atlantic and Mediterranean regions.
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hal-00419720 , version 1 (24-07-2020)

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Isabelle Dormoy, Odile Peyron, Nathalie Combourieu-Nebout, Simon Goring, Ulrich Kotthoff, et al.. Terrestrial climate variability and seasonality changes in the Mediterranean region between 15,000 and 4,000 years B.P. deduced from marine pollen records. Climate of the Past, 2009, 5, pp.615-632. ⟨10.5194/cp-5-615-2009⟩. ⟨hal-00419720⟩
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