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Contrasting patterns of precipitation seasonality during the holeocene in the south- and north-central Mediterranean (Articolo in rivista)

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Contrasting patterns of precipitation seasonality during the holeocene in the south- and north-central Mediterranean (Articolo in rivista) (literal)

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Magny M. [1]; Peyron O.[1]; Sadori L. [2]; Ortu E. [1]; Zanchetta G. [3]; Vannière B. [1]; Tinner W. [4] (2012)
Contrasting patterns of precipitation seasonality during the holeocene in the south- and north-central Mediterranean
in Journal of quaternary science (Online); WILEY-BLACKWELL, MALDEN 02148,MA (Stati Uniti d'America)
(literal)

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Magny M. [1]; Peyron O.[1]; Sadori L. [2]; Ortu E. [1]; Zanchetta G. [3]; Vannière B. [1]; Tinner W. [4] (literal)

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[1] Laboratoire de Chrono-Environnement, UMR 6249 du CNRS, UFR des Sciences et Techniques, 16 route de Gray, 25 030 Besançon, France [2] Dipartimento di Bilogia Ambientale, Universita \"La Sapienza\", Roma, Italy [3] Dipartimento di Scienze della Terra, and IGC-CNR, Pisa, Italy [4] Paleoecology, Institute of Plant Sciences and Oeschger Center for Climate Change Research, University of Bern, Bern, Switzerland (literal)

Titolo

Contrasting patterns of precipitation seasonality during the holeocene in the south- and north-central Mediterranean (literal)

Abstract

Pollen-based quantitative estimates of seasonal precipitation from Lake Pergusa and lake-level data from Lake Preola in Sicily (southern Italy) allow three successive periods to be distinguished within the Holocene: an early Holocene period before ca. 9800 cal a BP with rather dry climate conditions in winter and summer, a mid-Holocene period between ca. 9800 and 4500 cal a BP with maximum winter and summer wetness, and a late Holocene period after 4500 cal a BP with declining winter and summer wetness. This evolution observed in the south-central Mediterranean shows strong similarities to that recognized in the eastern Mediterranean. But, it contrasts with that reconstructed in north-central Italy, where the mid-Holocene appears to be characterized by a winter (summer) precipitation maximum (minimum), while the late Holocene coincided with a decrease (increase) in winter (summer) precipitation. Maximum precipitation at ca. 10 000-4500 cal a BP may have resulted from (i) increased local convection in response to a Holocene insolation maximum at 10 000 cal a BP and then (ii) the gradual weakening of the Hadley cell activity, which allowed the winter rainy westerlies to reach the Mediterranean area more frequently. After 4500 cal a BP, changes in precipitation seasonality may reflect non-linear responses to orbitally driven insolation decrease in addition to seasonal and inter-hemispheric changes of insolation. Copyright (C) 2011 John Wiley & Sons, Ltd. (literal)

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