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Actualités et séminaires

  • 26 May Séminaire
    A paleolimnological perspective on avian population dynamics and their effect on lake productivity in a rapidly warming Arctic

    Rapid warming since the 19th century is transforming the Arctic, including its freshwater ecosystems as warmer temperatures and greater nutrient inputs from a greening landscape are increasing lake and pond productivity. However, nutrients from growing avian nesting colonies can have a much greater effect on aquatic primary production, as undisturbed Arctic catchments have relatively low nutrient inputs. Therefore, a more complete assessment of climate warming’s influence on Arctic aquatic primary production should consider how warming may influence avian population dynamics.

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  • 16 May Séminaire
    Evolutions futures des ressources en eau en France et conséquences possibles sur l’irrigation
  • 28 Mar Séminaire
    Structure and hydrogeology of the Ox Bel’Ha karstic system, Mexico

    The Ox Bel’Ha and Sac Actun karstic systems are among the longest coastal cave systems in the world. These systems are located around and below the city of Tulum on the east side of the Yucatan peninsula. Divers have explored and mapped them for years and obtained detailed topographical information. The caves are mainly shallow (15-30 m below surface) and form a dense network of submerged caves directly outflowing to the ocean. The rapid urban development of Tulum goes with decreasing groundwater quality in the karstic system and a new threat for the coral reef and its biodiversity.

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  • 21 Mar Séminaire
    Mieux prendre en compte la courte durée de vie du méthane sur le changement climatique. Implications pour l’évaluation de l’impact climatique du système agrialimentaire européen

    Le méthane est un gaz à effet de serre à courte durée de vie. Cela le distingue fondamentalement du gaz carbonique et raisonner en équivalent CO2 comme le font la plupart des calculs d’empreinte carbone est une approximation dont la simplicité d’usage peut conduire à des interprétations erronées concernant l’impact climatique des émissions de méthane d’un secteur d’activités. Pour un gaz à courte durée de vie comme le méthane, la dynamique temporelle des émissions sur plusieurs décennies importe plus que leur niveau absolu à un moment donné.

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  • 17 Mar Séminaire
    Near-Surface Geophysical Insights into Geyser Structure and Dynamics, Yellowstone National Park, WY

    Hydrothermal geysers are visually engaging geomorphic features that represent a rapid and occasionally violent release of energy manifested as hydrothermal fluids/vapors launched skyward. Although not completely rare worldwide, hydrothermal geysers intrigue humans now and throughout history. Fortunately for us, Yellowstone National Park is home to roughly 500 geysers, making it the most concentrated geyser field in the world. Yet, the dynamics of geyser eruptions are uncertain. Much of this uncertainty stems from a lack of knowledge of their subsurface structure.

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