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Theses

Different soil study tools to better understand the dynamics of carbon in soils at different spatial scales, from a single soil profile to the global scale

Abstract : Soils are the major components ofthe terrestrial ecosystems and the largest organiccarbon reservoir on Earth, being very reactive tohuman disturbance and climate change. Despiteits importance within the carbon reservoirs, soilcarbon dynamics is an important source ofuncertainties for future climate predictions. Theaim of the thesis was to explore different aspectsof soil carbon studies (Experimentalmeasurements, modeling, and databaseevaluation) at different spatial scales (from thescale of a profile to the global scale). Wehighlighted that the estimation of the global soilcarbon stocks is still quite uncertain.Consequently, the role of soil carbon in theclimate dynamics becomes one of the majoruncertainties in the Earth system models (ESMs)used to predict future climate change. Thesecond part of thesis deals with the presentationof a new version of the IPSL-Land SurfaceModel called ORCHIDEE-SOM, incorporatingthe 14C dynamics in the soil. Several tests doneassume that model improvements should focusmore on a depth dependent parameterization,mainly for the diffusion, in order to improve therepresentation of the global carbon cycle inLand Surface Models, thus helping to constrainthe predictions of the future soil organic carbonresponse to global warming.
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Submitted on : Wednesday, June 6, 2018 - 5:22:06 PM
Last modification on : Friday, August 21, 2020 - 5:03:46 AM
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  • HAL Id : tel-01809523, version 1

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Marwa Tifafi. Different soil study tools to better understand the dynamics of carbon in soils at different spatial scales, from a single soil profile to the global scale. Climatologie. Université Paris Saclay (COmUE), 2018. Français. ⟨NNT : 2018SACLV021⟩. ⟨tel-01809523⟩

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