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Modélisation atmospherique régionale du cycle des isotopes stables de l'eau

Abstract : Climate change has recently become a major concerning among scientists and the general public. A better
knowledge of past climates helps forecasting the future evolution of climate. Stable water isotopes stand as
an outstanding paleo-climate proxy. Physical properties of heavy stable water isotopes (H182 O; HDO) cause
fractionation processes related to temperature and degree of distillation. If the isotopic signal is correctly
inverted, past climate change can be inferred from isotopic archives.
Andean ice-cores offer a unique records of tropical climate and its variability through time. However, the
interpretation of the isotopic signal is difficult because of complex atmospheric dynamic over South America.
For this purpose, we developed a module handling the stable water isotope fractionation processes within the
regional circulation model REMO and applied it to South America.
The manuscript outlines the major milestones of the present PhD. We first introduce the research topic
in the wider scope of climate change; the description of the stable water isotope enabled regional circulation
model REMOiso; an initial validation of REMOiso over Europe; an investigation of the seasonal variations
of precipitation, atmospheric circulation and isotopic signal over South America; and at last the recording of
the south American monsoon system (SAMS) by stable water isotope diagnostics.
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Contributor : Kristof Sturm <>
Submitted on : Friday, September 16, 2005 - 3:39:39 AM
Last modification on : Thursday, November 19, 2020 - 3:54:26 PM
Long-term archiving on: : Friday, April 2, 2010 - 10:20:19 PM


  • HAL Id : tel-00010157, version 1



Kristof Sturm. Modélisation atmospherique régionale du cycle des isotopes stables de l'eau. Hydrology. Université Joseph-Fourier - Grenoble I; Université de Hambourg, 2005. English. ⟨tel-00010157⟩



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