DATE2019-01-08 12:44:22
IDABSTRACT2014/103
CONTACTregattieri@dst.unipi.it
PRESENTATIONORAL
INVITED0
IDSESSION1
TITLEMIS 5 HYDROLOGICAL VARIABILITY FROM D18O COMPOSITION OF SPELEOTHEMS AND LAKES CARBONATES FROM APENNINE SITES (ITALY)
AUTHORSEleonora Regattieri (1,2)|Giovanni Zanchetta (1,2,4,5)|Russell Neil Drysdale (3,6)|Biagio Giaccio (4)|Ilaria Isola (5)|John C Hellstrom (7)|Sebastien Nomade (8)|Chiara Boschi (2)
AFFILIATIONS
  1. Dipartimento di Scienze della Terra, University of Pisa, Pisa, Italy
  2. Istituto di Geoscienze e Georisorse IGG-CNR, Pisa, Italy
  3. Department of Resource Management and Geography, University of Melbourne , Melbourne, Australia
  4. Istituto di Geologia Ambientale e Geoingegneria, IGAG-CNR, Monterotondo Roma, Italy
  5. Istituto Nazionale di Geofisica e Vulcanologia, INGV , Pisa, Italy
  6. EDYTEM, UMR CNRS 5204, Université de Savoie, Le Bourget du Lac Cedex, France
  7. School of Heart Sciences, University of Melbourne, Melbourne, Australia
  8. Laboratoire des Sciences du Climat et de l’Environnement, IPSL, CEA/CNRS/UVSQ, Gif- Sur-Yvette, France
ABSTRACT There are few highly resolved, chronologically well-anchored continental records documenting the MIS5 climatic instability over Mediterranean area, particularly for montane sites. Understanding rapid climate changes in high-altitude areas is of particular relevance because water availability in the Mediterranean basin is generally scarce and unevenly distributed, and mostly dependent on runoff from mountain areas. We present a comparison of the hydrological variability emerged from a N-S transect over the Apennine (Italy) for early to late MIS5 (ca. 130 to 90 ka). Investigated stable isotope records comprise speleothems from the Apuan Alps (Corchia Cave and Tana che Urla Cave, Tuscany, northern Italy) and a lacustrine succession from the Sulmona basin (Abruzzo, southern Italy). All three records are independently dated by means of U/Th dating for speleothems and by 40Ar/39Ar dating and tephras correlations for lake carbonates. The observed variability, both on orbital to sub-orbital time scales, is interpreted in terms of changes in the amount and source of the precipitation and is consistent among the three sites, indicating a spatially consistent pattern of hydrological variability over the central and northern Apennines during MIS 5. The observed features correlate well also with Greenland /interstadials from GI27 to GI22 and with North Atlantic cold events from C28 to C22, indicating a strong Mediterranean-North Atlantic climate teleconnection during this period. Moreover, different amplitude of hydrological variability with respect to regional temperature records and correlations with pollen records, allow to disentangle the seasonality pattern of the precipitation for late MIS5 and to relate it to precessional forcing.
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