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Modélisation des bilans hydrologiques continentaux: variabilité interannuelle et tendances. Comparaison aux observations

Abstract : The work carried out during this thesis consisted in examining a broad range of processes related to the continental branch of the water cycle using the land surface model ORCHIDEE (ORganising Carbon and Hydrology In Dynamic EcosystEms), and in situ and satellite observations. By using data from the altimetry mission Topex/Poséidon and the gravimetric mission GRACE (Gravity Recovery And Climate Experiment), I showed that the ORCHIDEE model was able to reproduce the seasonal and interannual variations of water reservoirs on the continents. I provided, for the first time, a validation at global scale of water assessment estimated in this model. The important role of the tropical areas in the variability of the climate was also underlined. During the thesis, to study low frequency variations (decadal/multi-decadal), I built a new, long-period atmospheric forcing data set, called NCC (National Centers for Environmental Prediction/National Center for Atmospheric Research Corrected by Climate Research Unit), for land surface models. NCC extends from 1948 to 2000 with a spatial resolution of 1°x1° and a 6-hourly temporal resolution. The NCC data set was validated by discharges of the world's largest rivers and proved to be very useful in the study of the evolution of continental water storage during the past 50 years. One of the applications of NCC was to study the contribution of continental water to sea level variations. I showed that an increase in ocean temperature led to more water stored on the continents, leading to a negative feedback on sea level changes.
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Contributor : Thanh Ngo-Duc <>
Submitted on : Wednesday, January 18, 2006 - 10:39:53 AM
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Thanh Ngo-Duc. Modélisation des bilans hydrologiques continentaux: variabilité interannuelle et tendances. Comparaison aux observations. Sciences de la Terre. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011408⟩



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