Séminaire de Alex ANESIO : mardi 14 mars 2017 à 10h, salle Lliboutry
par- 20 janvier 2017 ( maj : 15 mars 2017 )
Texte en français
Abstract : It is now recognised that large expanses of ice in the polar regions are inhabited by active microbial communities forming one of the biomes of Earth. Microbes on ice are diverse, play an important role in the cycling of nutrients and can also modify the physical environment they live. For instance, microbial processes at the surface of glaciers and ice sheets can lead to the accumulation of labile dissolved and particulate organic carbon and this in turn have consequences to the delivery of nutrients to adjacent ecosystems. Furthermore, the accumulation of cells often seen at the surface of the ice clearly results in ‘biological darkening’ of glacier surfaces. Such darkening increases the amount of incident shortwave radiation available for ice ablation, and could be a contributing element to glacier thinning and wastage.
M. Alex Anesio is Professor of Biogeochemistry in the Bristol Glaciology Centre at the University of Bristol. He is the Director of the Bristol Glaciology Centre.
Séminaire animé par : Aurélien Domergue.
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