scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
Study of recent delta-D time series from Antarctica, Andes and Greenland ice cores.
Pacini Alessandra 1 , Evangelista Heitor 2 , Echer Ezequiel 3
1 National Institute for Space Research / University of Rio de Janeiro State / University of Oulu, 2
University of Rio de Janeiro State, 3 National Institute for Space Research
The relative abundance of fractioned stable isotopes in the water molecule allows the
reconstruction of past climate, which improves the actual knowledge on the terrestrial climate
dynamics. Analysis of the ice-cores isotopic composition, through the measurements of the
ratio between the hydrogen and its isotope deuterium (H/D or delta-D) and between the stable
oxygen and its isotope ( 16 O/ 18 O or delta- 18 O) may allow information on physical process
involved in the global hydrological cycle, considering their sensitivity to each step of this
process (evaporation from the sea surface, air mass mixture and long range transport, water
vapour condensation and snow freezing). Identify the main source of its temporal variations
could be the key of the climatic changes studies. Through the spectral and coherence analysis
of five recent delta-D time series measured at di
fferent locations, we discuss the solar cycle information inside its spectral features, as well as
the imprints of large-scale atmospheric circulation on the isotopic data.