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Séminaires

by Webmaster Legos last modified Feb 07, 2012 11:59 AM

Lundi 8 Juillet - Internal Waves: how is remote sensing adding to the picture?

by SEMSOU last modified Jun 12, 2019 03:11 PM
When Jul 08, 2019
from 02:00 PM to 03:00 PM
Where salle Coriolis
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Jorge Magalhaes

University of Porto, Portugal

 

 Title: Internal Waves: how is remote sensing adding to the picture?

 

Abstract: Remote sensing is becoming an increasingly valuable tool, whose global surveying abilities are far beyond those of traditional in situ measurements. It excels in acquiring and integrating multiple views of the ocean including synergies with numerical modelling and in situ data, and hence leverages our ability to document, understand, and predict a wide range of ocean phenomena. In particular, Internal Waves have been benefiting from several decades of satellite imagery, providing new answers for old questions as well as new questions for old problems.


Internal Solitary Waves off the Amazon River. Can you guess where they come from?


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Jeudi 4 Juillet - Estimation of the river Bankfull depth by the integration of a satellite observation and a river routing model

by SEMSOU last modified Jun 14, 2019 02:21 PM
When Jul 04, 2019
from 11:00 AM to 12:00 PM
Where salle Pyrénées
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Takuto SHIOZAWA

Institute of Industrial Science, University of Tokyo

 

Title: Estimation of the river Bankfull depth by the integration of a satellite observation and a river routing model

 

Abstract: A river bankfull depth, one of the important topographic parameters in a river routing model, was estimated efficiently by using the CaMa-Flood model and a satellite altimetry dataset. We applied the estimation method to the Amazon river basin, and, by an OSSE experiment, confirmed that river bankfull depth would be improved even if the uncertainty of runoff existed. In addition, by using a real satellite altimetry dataset, Hydroweb,  we estimated the river bankfull depth and confirmed this can make the inundation ratio in the basin estimated from the model closer to that from a SAR observation. Next challenges are to validate the method where cross-section data are available and to apply the method on a global scale.

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Vendredi 28 Juin - Submesoscale circulation modulates seasonality of marine ecosystem in the California Current System

by SEMSOU last modified Jun 13, 2019 09:34 AM
When Jun 28, 2019
from 11:00 AM to 12:00 PM
Where Salle Lyot
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Faycal Kessouri, Ph.D.

Southern California Coastal Water Research Project Authority &

University of California, Los Angeles


Title: Submesoscale circulation modulates seasonality of marine ecosystem in the California Current System


Abstract: Seasonal wind-driven upwelling supports phytoplankton blooms that turn the California Current into one of the most productive ecosystems of the ocean. Further offshore, mesoscale and submesoscale eddies counteract the upwelling by removing surface nutrients through subduction. I will demonstrate the role of the submesoscale circulation via three processes: First, submesoscale dynamics generated by increased frontogenesis during spring, controls up to 50% the vertical eddy transport of nutrients across the euphotic layer, reducing plankton productivity, and exporting biomass out of the euphotic layer. Second, in the offshore oligotrophic region, submesoscale eddies intensify the vertical velocities in winter, driving injection of nutrients from enriched thermocline to the depleted mixed layer and maintain productivity in the deep chlorophyll depth. Lastly, submesoscale eddies emphasize the generation of topographic wakes in Channel Islands leading to very high productivity as well as surfacing of unsaturated water of low pH.

Furthermore, upwelling system make this region vulnerable to ocean acidification and deoxygenation (OAD). Using these submesoscale-permitting simulations, UCLA, UW, NOAA and SCCWRP collaborate to investigate the potential exacerbation of local pollution on OAD in Southern California. The model demonstrates mechanistic linkages between physical and chemical drivers of OAD and their compression on pelagic and benthic habitats. Now, model simulations are used in ongoing discussions with local coastal managers to support local pollution and marine vulnerability assessments.

 

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