Accueil > Actualités > Séminaires > Séminaire de Mark D. Ohman au LOCEAN


Titre : Zooplanktonology for the physical scientist
Nom du conférencier : Mark D. Ohman
Son affiliation : Scripps Institution of Oceanography
Laboratoire organisateur : LOCEAN
Date et heure : 18-12-2018 11h00
Lieu : Campus de Jussieu, salle de réunion LOCEAN, tour 45/55, 4eme étage
Résumé :

The free-drifting zooplankton of the open sea are key intermediaries in a variety of ocean biogeochemical processes, including C cycling and export, dissolved oxygen distributions, and net primary production.  They also determine critical prey-predator linkages and pelagic food web stability.  However, the zooplankton are often reduced to a single 'Z' term in pelagic ecosystem models and represented with simple parameterizations.  This presentation seeks to open the 'black box' of the Z term for the physical scientist. Topics will include the size span of zooplankton and the implications of allometry (size-scaling) and different Reynolds number regimes; fundamental differences between single- and multi-cellular zooplankton and consequences for the biological C pump; the implications of an AR1 Double Integration model for understanding biological responses to physical forcing; and the role of zooplankton grazing in accelerating C export at (sub)mesoscale fronts. This presentation will also touch briefly on our newly developed Zooglider, which employs optical imaging and dual-frequency active acoustics to autonomously resolve zooplankton contributions to ecosystem processes.

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