Insight into summer drought in southern Italy: palaeohydrological evolution of Lake Pergusa (Sicily) in the last 6700 years - Université de Tours Accéder directement au contenu
Article Dans Une Revue Journal of Quaternary Science Année : 2022

Insight into summer drought in southern Italy: palaeohydrological evolution of Lake Pergusa (Sicily) in the last 6700 years

Résumé

The Sicily region (central Mediterranean) is at high risk of drying and desertification caused by current warming and land management. The aim of this study is to place current climatic changes within the past trajectories and natural climatic variability of the Holocene. For this we reexamine a sediment core retrieved at Lake Pergusa covering the last ca. 6700 years. A multiproxy investigation, and in particular the oxygen isotope composition of lacustrine carbonate (δ 18 O c), allowed us to reconstruct decadal-to centennial-scale hydrological changes. The wettest period occurred between ca. 6700 and 6000 cal a BP. The δ 18 O c record indicates a new period of wetter conditions between ca. 3700 and 2400 cal a BP. In particular, a δ 18 O c minimum between 2850 and 2450 cal a BP overlaps with the period of the 'Great Solar Minimum' and corresponds to a dramatic reduction of arboreal pollen (AP%) and to an increase in synanthropic pollen, marking the onset of Greek colonization in the region. The longest driest interval corresponds to the Medieval Climate Anomaly, whereas the highest δ 18 O c values are recorded in the last 150 years. The trend of the last 3000 years suggests that, considering future climate projections, the area will experience unprecedented drying exacerbated by human impact.
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hal-03907558 , version 1 (20-12-2022)

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Giovanni Zanchetta, Ilaria Baneschi, Michel Magny, Laura Sadori, Rosa Termine, et al.. Insight into summer drought in southern Italy: palaeohydrological evolution of Lake Pergusa (Sicily) in the last 6700 years. Journal of Quaternary Science, 2022, 37, pp.1280 - 1293. ⟨10.1002/jqs.3435⟩. ⟨hal-03907558⟩
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