Contrasting patterns of precipitation seasonality during the Holocene in the south- and north-central Mediterranean
Version of Record online: 4 NOV 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Journal of Quaternary Science
Volume 27, Issue 3, pages 290–296, 1/27 April 2012
How to Cite
Magny, M., Peyron, O., Sadori, L., Ortu, E., Zanchetta, G., Vannière, B. and Tinner, W. (2012), Contrasting patterns of precipitation seasonality during the Holocene in the south- and north-central Mediterranean. J. Quaternary Sci., 27: 290–296. doi: 10.1002/jqs.1543
- Issue online: 10 APR 2012
- Version of Record online: 4 NOV 2011
- Manuscript Accepted: 28 AUG 2011
- Manuscript Revised: 26 AUG 2011
- Manuscript Received: 30 MAY 2011
- modern analogues technique;
- precipitation seasonality;
- sapropel 1
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 © 2011 John Wiley & Sons, Ltd.