| AFFILIATIONS | - Earth Sciences Department, Pisa, Italy
- IGG-CNR, Pisa, Italy
- IGAG-CNR, Rome, Italy
- LSCE-CNRS, Gif sur Yvette, France
- University of Bern, Bern, Switzeland
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| ABSTRACT | The recovery of high-resolution records of climate variability from ice, marine and terrestrial archives has fundamentallychanged our perspective on global climate change by revealing the existence of very rapid and intense climate changes inthe past. As we are currently living in an interglacial period, the recognition of short term (i.e. multidecadal to millennial),global-scale climate variability within past interglacial is fundamental to better frame the background of natural variabilityin which human induced changes operate. (Tzedakis et al., 2009). The Marine Isotope Stage (MIS19), spanning the ca. 790-760 ka period is considered the best orbital analogue of the present interglacial over the last 1 Ma. Exploring patterns,causes and expression of its variability is important for framing Holocene climate into a historical-natural context and forprojecting its future in the light of both anthropogenic and natural forcing.Here we present an high resolution, multiproxy biogeochemical record (oxygen stable isotope composition, elemental andmineralogical composition, biogenic silica) from carbonatic endogenic lacustrine sediments hosted in the Sulmona Basin(central Italy) and covering the interglacial portion of MIS19. The record shows significant variability at the centennial tomillennial time scale. Sediments from the Sulmona Basin faithfully record regional hydrological and environmentalconditions, which can be linked to Mediterranean and North Atlantic conditions thanks to well-known climateteleconnections (e.g. Giaccio et al., 2015, Regattieri et al., 2016). The robust 40*Ar/39*Ar chronology developed onvolcanic ash layers (tephra) interbedded in the sediment allows to firmly place this variability onto an independent timescale. We investigate expression, pacing and periodicities of the short-term climate change and then compare it to theclimatic framework apparent from several North Atlantic marine records, to unravel potential forcing and mechanisms forintra-interglacial climate variability.Tzedakis, P. C., Raynaud, D., McManus, J. F., Berger, A., Brovkin, V., & Kiefer, T. (2009). Interglacial diversity. NatureGeoscience, 2(11), 751-755.Giaccio, B., Regattieri, E., Zanchetta, G., Nomade, S., Renne, P. R., Sprain, C. J., ... & Sposato, A. (2015). Duration anddynamics of the best orbital analogue to the present interglacial. Geology, 43(7), 603-606.Regattieri, E., Giaccio, B., Galli, P., Nomade, S., Peronace, E., Messina, P., ... & Gemelli, M. (2016). A multi-proxy record ofMIS 11–12 deglaciation and glacial MIS 12 instability from the Sulmona Basin (central Italy). Quaternary Science Reviews,132, 129-145. |