Agenda

03 Nov 2016 12:00

The isotopic composition of daily-collected snow samples at Dome C, East Antarctica

Campus Scientifico via Torino - edificio DELTA, Aula 0B

Giuliano Dreossi, Dipartimento di Scienze Ambientali, Informatica e Statistica - Università Ca’ Foscari Venezia

Abstract: The oxygen and hydrogen isotopic composition of precipitation shows a linear correlation with local surface temperature, at least at mid and high latitudes. During the last decades the isotopic records from ice cores have been widely used to reconstruct the temperature of the past, but the isotope-temperature relationship is site-specific and is characterized by significant variations. It is crucial to better understand the mechanisms influencing the isotopic content of precipitation and to assess the sensitivity of the isotope thermometer for one of the most important drilling sites of the Antarctic continent, home of the 800,000 year-long Epica Dome C ice core. Since 2008, precipitation samples have been collected daily on a support placed 800 m away from the French-Italian Concordia base, while an automatic weather station has been recording temperature since 1995. The correlation between the isotopic composition of precipitation and the temperature is very good, using both daily and mean monthly values, and shows some minor variations from one year to another for the 2008-2014 sampling period. The sampling is the first and so far only multi-year series of isotopes in precipitation in Antarctica.

Lingua

L'evento si terrà in italiano

Organizzatore

Dipartimento di Scienze Ambientali, Informatica e Statistica - Barbara Stenni

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