Résultats de recherche
Nombre de programmes trouvés : 12
Vidéocours
le
(4m53s)
EN - 15. The nitrogen cycle in Paris
...Sabine Barles, Professor of urban planning and development at the University of Paris 1 Panthéon-Sorbonne and researcher at the UMR Géographie-Cités, presents the nitrogen balance of the Paris conurbation by highlighting the flows in and out. She...
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Vidéocours
le
(6m1s)
EN - 14. Disturbances in the nitrogen cycle and related impacts
...Sabine Barles, Professor of Urban Planning and Development at the Université Paris 1 Panthéon-Sorbonne and researcher at the UMR Géographie-Cités, discusses the origin and extent of anthropogenic perturbations in the nitrogen cycle. She explains the...
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Vidéocours
le
(6m14s)
EN - 16. The environmental footprint explained through the example of Paris
...Sabine Barles, Professor of Urban Planning and Development at the University of Paris 1 Panthéon-Sorbonne and researcher at the UMR Géographie-Cités, presents the supply of food nitrogen in Paris, highlighting the regions of France and of the world...
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Vidéocours
le
(11m11s)
EN-5. Nitrous oxide: a natural cycle disrupted by human activity
...Nicolas Vuichard talks about nitrous oxide, a powerful greenhouse gas. He first shows the extent of the nitrogen cycle disruption by human activity, then he precisely examines the N2O emissions sources and the action leads to reduce these emissions....
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Vidéocours
le
(9m7s)
EN - 3. The limitations of the earth system - part 2
... consumption, nitrogen and phosphorus cycles, stratospheric ozone, aerosols, foreign substances, and ocean acidification....
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Documentaires
le
(38m27s)
Fabaceae
... gender Rhizobium, which reduce the atmospheric nitrogen N2 found in the soil to NH3 ammonia and then form amino acids for the plant. Thus, the clover allows the fixation of 400 kg of atmospheric nitrogen per hectare and per year. The leaves are...
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Conférences
le
(23m15s)
Interlocking Natural and Social Systems - Resilience, Governance and Research Policy Considerations
... the current situation of civilisation seems to be characterised by the quickly growing interference and to some extent control by humans over natural flows e.g. the carbon or nitrogen cycles to an extent not earlier seen in history. This development is...
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Vidéocours
le
(7m57s)
Atmospheric chemistry, pollution and climate change - Solène Turquety
How do atmospheric pollutants impact on the climate? What is the radiative impact of aerosols?Budget of the radiative impacts. What is the benefit to the climate of improving air quality? What impact does climate change have on air pollution?
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Clip pédagogique
le
(3m5s)
Une mise en évidence expérimentale de transfert d'azote
Pour subvenir à leurs besoins, plantes et champignons ont recours à la symbiose.Afin d'identifier les échanges d'éléments nutritifs qui ont lieu entre les deux organismes, des chercheurs procèdent à une expérience pour observer le transfert des isotopes 14 et 15 de l'azote naturellement présents dans les nitrates et l'ammonium dont se nourrit la plante.
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Conférences
le
(31m27s)
From Climate Models to Earth System Models
Complex climate models that describe the evolution of the coupled ocean atmosphere cryosphere system are gradually extended to “non physical” components of the earth system, and account for land vegetation dynamics, ocean biology, global biogeochemistry and atmospheric chemistry. In the future, these models will have to better represent the potential feedbacks with society and therefore to couple the natural bio-physical components with the socio-economic system. The paper will review the present status of complex climate and Earth system models, report some preliminary attempts to include societal aspects, and highlight challenges for future research.
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