Search results for "Clima"
showing 10 items of 6069 documents
Effects of microclimate on nest site selection and breeding success of lesser kestrel Falco naumanni in the Gela Plain (Sicily)
2013
Quel statut pour les espaces de montagne durant l'âge du Bronze ? Regards croisés sur les approches société-environnement dans les Pyrénées occidenta…
2005
After having been neglected for some time, mountain environments have now become an important research area for the study of anthropogenic impact on the environment and the interactions of societies with their environments. The recent development of several interdisciplinary programs in the Alps and in the Pyrenees reveals the interest and the scientific questions associated with these domains. In the Pyrenees, the work undertaken in the Basque Country illustrates the utility of the development of multidisciplinary research on a large scale, which is both diachronic and has a high resolution chronology. Combining environmental and archaeological data, allows us to present an image of popula…
Biogeographic patterns of base-rich fen vegetation across Europe
2014
International audience; Questions: What is the distribution of base-rich fen vegetation and the specia- list species along European biogeographic regions? How do the gradients in spe- cies composition correlate to geography and climate at continental scale? What are the implications of such patterns for the classification of these habitats?Location: Fifteen countries of Central, Western and Northern Europe.Methods: We compiled a vegetation plot database of base-rich fens and related communities including vascular plants and bryophytes. The initial data set with 6943 plots was filtered according to the presence of specialists using discriminant analysis. We used DCA to analyse the correlatio…
Greater mitochondrial energy production provides resistance to ocean acidification in "winning" hermatypic corals
2021
Coral communities around the world are projected to be negatively affected by ocean acidification. Not all coral species will respond in the same manner to rising CO2 levels. Evidence from naturally acidified areas such as CO2 seeps have shown that although a few species are resistant to elevated CO2, most lack sufficient resistance resulting in their decline. This has led to the simple grouping of coral species into “winners” and “losers,” but the physiological traits supporting this ecological assessment are yet to be fully understood. Here using CO2 seeps, in two biogeographically distinct regions, we investigated whether physiological traits related to energy production [mitochondrial e…
CNO and pep solar neutrino measurements and perspectives in Borexino
2015
International audience; The detection of neutrinos emitted in the CNO reactions in the Sun is one of the ambitious goals of Borexino Phase-II. A measurement of CNO neutrinos would be a milestone in astrophysics, and would allow to solve serious issues in current solar models. A precise measurement of the rate of neutrinos from the pep reaction would allow to investigate neutrino oscillations in the MSW transition region. The pep and CNO solar neutrino physics, the measurement in Borexino Phase-I and the perspectives for the new phase are reviewed in this proceeding.
Measurement of Solar pp-neutrino flux with Borexino: results and implications
2015
International audience; Measurement of the Solar pp-neutrino flux completed the measurement of Solar neutrino fluxes from the pp-chain of reactions in Borexino experiment. The result is in agreement with the prediction of the Standard Solar Model and the MSW/LMA oscillation scenario. A comparison of the total neutrino flux from the Sun with Solar luminosity in photons provides a test of the stability of the Sun on the 10(5) years time scale, and sets a strong limit on the power production by the unknown energy sources in the Sun.
Modelización de riesgos climáticos y sistemas de vigilancia y alerta en la Comunitat Valenciana
2013
El primer objetivo de esta Tesis está relacionado con el desarrollo e implementación de diferentes sistemas de vigilancia y alerta para el territorio de la Comunitat Valenciana: un sistema de predicción meteorológica en tiempo real basado en el modelo atmosférico de mesoescala Regional Atmospheric Modeling System (RAMS) y un sistema de previsión del Índice UV (UVI), basado en el modelo Santa Barbara DISORT Atmospheric Radiative Transfer (SBDART). Además, se propone una metodología que proporciona un entorno computacional adecuado para la administración y coordinación de los diferentes procesos implicados en ambos sistemas de vigilancia. La principal mejora de la predicción UVI es la utiliza…
Interactions, spillovers de connaissance et croissance des économies modernes. Faut-il préférer la globalisation ou la proximité géographique ?
2009
Globalisation and metropolisation in modern economies induce some locational strategies of knowledge based activities towards cities and deeply increase trade and move of ideas across cities. In that context, we study the way knowledge spillovers have influenced the economic growth of 82 European Metropolises over the 1990-2005 period. We model knowledge spillovers across cities according to three specific interaction patterns depending either on geography or on global advanced services or thought a combination of these patterns. We show that the mixed pattern matters the best for economic growth of cities in Europe.
Estimation du rayonnement solaire dans le sud-ouest de l’océan Indien et a la Réunion : modélisation régionale du climat.
2014
6 pages; International audience; On analyse ici la capacité du modèle climatique régional RegCM4 à simuler les champs radiatifs, la températurede surface et les précipitations sur un domaine couvrant l’Afrique australe et le sud-ouest de l’océan Indien (0-40°S ; 0-100°E), centré sur La Réunion. Les données produites par le modèle sont confrontées aux données d’observations CERESpour les paramètres du rayonnement (ondes courtes et longues) et GPCP pour les précipitations, et aux données desréanalyses ERA-Interim pour la température. Six simulations ont été conduites, chacune avec un schéma de convectiondifférent, afin de tester la sensibilité des résultats à la physique du modèle.Le schéma m…
Impact du climat sur la santé : modélisation régionale des poussières pour les épidémies de méningites au Sahel.
2014
6 pages; International audience; Les épidémies des méningites bactériennes constituent encore à l’heure actuelle un problème de santé publiquemajeur en Afrique de l’Ouest. Chaque année, au coeur de la saison sèche (de janvier à mars), 25 000 à 250 000 cas sontenregistrés par l’Organisation Mondiale de la Santé (OMS) dans la zone latitudinale 10-15°N, plus communément appelée« ceinture de la méningite ». L’importance des facteurs sociétaux dans l’expansion des épidémies est indéniable. Cependant,une série d’études récentes a permis de mettre en lumière le rôle important du climat. Ainsi, l’intensité des épidémies sembleliée à des conditions de circulation atmosphérique spécifiques quelques m…