Istituto di Geoscienze e Georisorse     
Magny M., Peyron O., Sadori L., Ortu E., Zanchetta G., Vannière B., Tinner W. Contrasting patterns of precipitation seasonality during the holeocene in the south- and north-central Mediterranean. In: Journal of Quaternary Science, vol. 27 (3) pp. 290 - 296. Willey, 2012.
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.
URL: http://www.interscience.wiley.com/jpages/0267-8179
Subject Mediterranean
modern analogues technique
precipitation seasonality
sapropel 1

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