MEDITERRANEAN VEGETATION, LAKE LEVELS AND PALEOCLIMATE AT THE LAST GLACIAL MAXIMUM

International audience THE apparent conflict between pollen evidence for widespread Artemisia steppe1-6 (implying semi-arid conditions) and geomorphological evidence for high lake levels4,7-11 has produced controversy about the ice-age palaeoclimate of the Mediterranean region. Here we use a water-b...

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Bibliographic Details
Published in:Nature
Main Authors: Prentice, Ic, Guiot, Joel, Harrison, Sp
Other Authors: Institut Méditerranéen d'Ecologie et de Paléoécologie (IMEP), Université Paul Cézanne - Aix-Marseille 3-Centre National de la Recherche Scientifique (CNRS)-Avignon Université (AU)-Université de Provence - Aix-Marseille 1
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 1992
Subjects:
envir
geo
North Atlantic
Online Access:https://doi.org/10.1038/360658a0
https://hal.archives-ouvertes.fr/hal-01457557
Description
Summary:International audience THE apparent conflict between pollen evidence for widespread Artemisia steppe1-6 (implying semi-arid conditions) and geomorphological evidence for high lake levels4,7-11 has produced controversy about the ice-age palaeoclimate of the Mediterranean region. Here we use a water-balance model12 (to predict catchment runoff ) and a biome model13 (to predict vegetation type) to reconstruct the palaeoenvironment around Lake Ioannina-a type locality for the northern Mediterranean region. We show that both sets of evidence are compatible with a summer-dry, winter-wet regime with seasonal temperature anomalies similar to those predicted by atmospheric model simulations of the Last Glacial Maximum14-18. The drying effect of the cold North Atlantic Ocean may have been counteracted in winter by increased storm frequency under a southward-shifted jet stream, as shown by several atmospheric models16-18.

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