4,361 research outputs found

    The HyMeX (Hydrological cycle in the Méditerranean Experiment) program: The specific context of oceanography

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    Drobinski, Philippe ... et al.- 2 pages, 1 figurePeer Reviewe

    A primer on innovation and growth

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    Philippe Aghion emphasises that for Europe to stimulate innovation and growth, it is not enough to increase spending on research and development and the protection of intellectual property.

    First Mediterranean Assessment Report – Chapter 3.3: Resources – Energy transition

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    Chapter 3.3: Resources – Energy Transition of the First Mediterranean Assessment Report (MAR1) published by MedECC in November 2020. Current Mediterranean greenhouse gas emissions amount to a relatively low level of 6% of the global emissions, a proportion close to its proportion of the world population (7.4%). The expected impacts of climate and environmental changes necessitate an accelerated energy transition in the countries of this region to enable a secure, sustainable and inclusive development. The primary energy consumption in the Mediterranean Basin from 1980 to 2016 has steadily increased by approximate 1.7% annually. This trend is mostly related to a steady increase in the consumption of oil, gas, nuclear and renewables and is caused by changes in demographic, socioeconomic (lifestyle and consumption) and climatic conditions in the region. While the northern rim countries advance in gradually diversifying their energy mix, improving energy efficiency and increasing the fraction of renewable energy sources, the eastern and southern rim countries (SEMCs) still lack behind in these developments. The Mediterranean Basin, especially the SEMCs, has large potential for renewable energy, terrestrial as well as marine, including wind, solar, hydro, geothermal, bioenergy, waves and currents. With the increase of the share of renewables, the electricity transmission system will be more exposed to weather variations and may be threatened by specific weather conditions that are usually not considered as extremes.Preferred citation: Drobinski P, Azzopardi B, Ben Janet Allal H, Bouchet V, Civel E, Creti A, Duic N, Fylaktos N, Mutale J, Pariente-David S, Ravetz J, Taliotis C, Vautard R 2020 Energy transition in the Mediterranean. In: Climate and Environmental Change in the Mediterranean Basin – Current Situation and Risks for the Future. First Mediterranean Assessment Report [Cramer W, Guiot J, Marini K (eds.)] Union for the Mediterranean, Plan Bleu, UNEP/MAP, Marseille, France, pp. 265-322, doi:10.5281/zenodo.7101088

    Impact of terrain heterogeneity on near-surface turbulence structure

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    International audienceThis study investigates the impact of terrain heterogeneity on local turbulence measurements using 18 months of turbulence data taken on a 30 m tower at the SIRTA mixed land-use observatory under varying stability conditions and fetch configurations. These measurements show that turbulence variables such as the turbulent kinetic energy or momentum fluxes are strongly dependent on the upstream complexity of the terrain (presence of trees or buildings, open field). However, using a detection technique based on wavelet transforms which permits the isolation of the large-scale coherent structures from small-scale background fluctuations, the study shows that, for all stability conditions, whatever the upstream complexity of the terrain, the coherent structures display universal properties which are independent of the terrain nature: the frequency of occurrence, time duration of the coherent structures, the time separation between coherent structures and the relative contribution of the coherent structures to the total fluxes (momentum and heat) appear to be independent of the upstream roughness. This is an important result since coherent structures are known to transport a large portion of the total energy. This study extends to all stability conditions a numerical study by Fesquet et al. [Fesquet, C., Dupont, S., Drobinski, P., Barthlott, C., Dubos, T., 2008. Impact of terrain heterogeneities on coherent structures properties: experimental and numerical approaches. In: 18th Symposium on Boundary Layers and Turbulence. No. 11B.1. Stockholm, Sweden., Fesquet, C., Dupont, S., Drobinski, P., Dubos, T., Barthlott, C., in press. Impact of terrain heterogeneity on coherent structure properties: numerical approach. Bound.-Layer Meteorol.] conducted in neutral conditions which shows that a reason for such behavior is that the production of local active turbulence in an internal boundary layer associated with coherent structure originating from the outer layer and impinging onto the ground is not sensitive to the nature of the terrain

    Histoire de la Deuxième Guerre Mondiale (1992-1997) (09). Philippe Burrin (1) - face B

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    Séminaire organisé et enregistré par l'IHTP (Paris), entre 1992 et 1997 ; sous la direction de Jean-Pierre Azéma et Dominique Veillon. Communication de Philippe Burrin

    Histoire de la Deuxième Guerre Mondiale (1992-1997) (09). Philippe Burrin (1) - face A

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    Séminaire organisé et enregistré par l'IHTP (Paris), entre 1992 et 1997 ; sous la direction de Jean-Pierre Azéma et Dominique Veillon. Communication de Philippe Burrin

    Histoire de la Deuxième Guerre Mondiale (1992-1997) (10). Philippe Burrin (2) - face B

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    Séminaire organisé et enregistré par l'IHTP (Paris), entre 1992 et 1997 ; sous la direction de Jean-Pierre Azéma et Dominique Veillon. Communication de Philippe Burrin (suite)

    Histoire de la Deuxième Guerre Mondiale (1992-1997) (10). Philippe Burrin (2) - face A

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    Séminaire organisé et enregistré par l'IHTP (Paris), entre 1992 et 1997 ; sous la direction de Jean-Pierre Azéma et Dominique Veillon. Communication de Philippe Burrin (suite)
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