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Nombre de programmes trouvés : 76
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le (17m29s)

Long Term Climate Variability: from Past to Future and from Data to Models

Data show that climate has always changed in the past, sometimes with a larger amplitude than what we experimented for two decades. But the main signatures of the anthopogenic forcing are the speed of the change and its globality. Paleodata at different scales are used to test the realism of climate model simulations and then their ability to simulate climates very different from the present one. They are used also to test impact models for water, forest resources. This talk aims to illustrate how paleoclimatology can bring a lot to global change studies, because it privileges interdisciplinary approaches.
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Conférences

le (17m29s)

Comparison of Simulated Tree-Ring Cellulose d180 at the European Scale

In order to investigate factors involved in the inter-annual variability of d180 in tree ring cellulose (d18OTRC), we simulated the d18OTRC from 1960 to 2001 over Europe. We used 1) simulated climate and water isotope fields of REMOiso, a meso-scale circulation model, 2) hypotheses of the distribution of roots and soil hydrology, and 3) a mechanistic model of oxygen-isotopes in tree ring cellulose (d18OTRC). Sensitivity tests show that relative humidity of the air and soil water d18O contribute differently to the d180 in tree ring cellulose according to regional climate. In the commonly observed hydrological situation, humidity of the air ...
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Conférences

le (17m43s)

The Intergenerational Equity: A Concept to Build for Sustainability, the Case of Global Warning

Defined as “the relation that each generation has with the last or future generations in the use... of the natural or cultural resources of planet”, Intergeneration equity (here I.E) imposes rules of optimal use of these resources on each generation. But it still remains a vague concept which needs a clear definition and poses some philosophical problems. Its emergence in right of the environment followed the scientific awakening on the ecological threats, in the years 1960 and led to a greater implication of the United Nations to coordinate international actions in environment field. The conferences of Stockholm in 1972 and ...
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