Seminario "Paleoclimate reconstructions from polar ice core records"
Luogo e orario: ore 13
Aula 6202, C3A
Via E. Mach, 1 - 38010 San Michele all'Adige
All'interno del corso "Tracciabilità della filiera viti-enologica e metabolomica applicata" - corso di laurea in Viticoltura ed Enologia, la prof.ssa Barbara Stenni [Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice] terra un seminario dal titolo:
Paleoclimate reconstructions from polar ice core records
Polar ice sheets are among the most powerful natural archives preserving climate information ranging in time from our “recent” past to the last glacial/interglacial cycles. Deep ice cores, drilled both in Greenland and Antarctica in the last decades, are documenting the natural climate variability experienced by the high latitude regions over the late Pleistocene. It is well known that the isotopic ratios (18O/16O and 2H/1H), measured in polar ice cores, allow paleotemperature reconstructions to be derived. The main key factors controlling the oxygen and hydrogen isotope composition of present-day Antarctic precipitation are mainly related to the condensation temperature of the precipitation and the origin of the moisture. The deuterium excess, d = d2H – 8*d18O, is a second-order isotopic parameter, containing information about climate conditions prevailing in the source regions of Antarctic precipitation. We can consider the water stable isotopes as integrated tracers of the atmospheric water cycle.
Here I will present the isotopic records provided by both deep ice cores recovered in Antarctica and in Greenland covering the past climate cycles as well more recent temperature reconstructions obtained in the framework of the PAGES Antarctica2k project covering the past 2000 years. Moreover, I will present the results of a multiyear survey that has been carried out in the inland plateau site of Dome C (75°06’S 123°21’E; 3233 m; T=-54.5°C; snow acc. rate 25 kg m-2 yr-1) in East Antarctica, where precipitation samples have been collected over the last decade.