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| activités | bourse | liens | membres | contact | ||
date |
Mercredi, 15 novembre 2006 |
lieu |
Pavillon
Vachon (salle 3068), Université Laval |
| heure
|
11h00 |
| Rafel
Simo Institut
de Ciències del Mar, Espagne
|
|
Ups
and downs in the plankton/sulfur/solar radiation feedback?
|
The
hypothesis that oceanic plankton influence climate through the production
and emission of the cloud precursor dimethylsulfide (DMS) has fostered
intensive research on the cycle of biogenic sulfur in the ocean.
Because of the cross-scale nature of the hypothesis, DMS research
has to be conducted at multiple temporal and spatial scales and with
a big load or multidisciplinariety. Over recent years, the incorporation
of molecular tools for single-cell analysis of biogeochemical processes,
the performance of ecosystem-scale perturbation experiments, and
the use of new-generation satellite sensors for global observation,
have yielded important advances in the knowledge of the DMS cycle.
In this talk, I will present very recent work conducted in our group
on single-cell sulfur biogeochemistry as well as global observation
and modeling of the bidirectional links between oceanic DMS, cloud-forming
aerosols and solar radiation. |
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