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TICOPIC - Triple Isotopic Composition of Oxygen in Polar Ice Core to understand the links between climate change and water cycle

Summary information

Funding:FP6 - Marie Curie Actions
Ec contribution:172254
Start date:2005-11-01
End date:2007-01-31
Duration:15 months
Coordinator:Boaz Luz (
Organisation:Hebrew University of Jerusalem, Institute of Earth Sciences, Faculty of Science - Israël
Project name:TICOPIC - Triple Isotopic Composition of Oxygen in Polar Ice Core to understand the links between climate change and water cycle
Project summary:Abstract
Strong modifications of the water cycle favoured the major climate changes. Over the late Quaternary, the measurements of three water isotopes (H216O, HDO, H218O) in deep Antarctic and Greenland ice cores suggested a strong relationship between climate and water cycle over the succession of glacial and interglacial period and over the rapid climatic variability of the last glacial period.

Such a result comes from the different mass-dependent fractionation processes (equilibrium and kinetic) in the water cycle. However, even if a huge measurements and isotopic modelling effort was produced, no quantitative reconstruction of past changes of water cycle could be proposed (especially changes in temperature and humidity of evaporative regions). It therefore prevents correct description of the water cycle in global models to describe climate change mechanisms.

The last water isotope, H217O, as additional ice core tracer, should provide the missing information because of different equilibrium and kinetic fractionation coefficients (as shown by preliminar measurements and simple modelling studies). Its difficult analytical measurement with sufficient precision for that purpose is now possible at the Institute of Earth Sciences in Jerusalem.

After a first calibration part with laboratory experiment and existing sampling over polar transects, we propose to measure H217O in deep ice cores in Antarctica and Greenland where H218O and HD16O are available to understand quantitatively the links between climate and water cycle variations. The use of simple and GCM models including water isotopes will favour the interpretation.

My knowledge of isotopes in ice cores and of the European ice cores community, the unique expertise of the Institute of Earth Sciences in H217O measurements and the collaboration with Laboratoire des Sciences du Climat et de l'Environnement for isotopic modelling are great advantages for the success of the project.