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Séminaires

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

Vendredi 15 Février - GEOVIDE: The French GEOTRACES North Atlantic Transect (GA01). Insights into the main results

by SEMSOU last modified Jan 30, 2019 12:28 PM
When Feb 15, 2019
from 10:00 AM to 11:00 AM
Where Salle Jules Verne
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Géraldine Sarthou

Directrice de Recherche CNRS au LEMAR, France

 

Title: GEOVIDE: The French GEOTRACES North Atlantic Transect (GA01). Insights into the main results.


Abstract: The GEOVIDE cruise, a collaborative project within the framework of the international GEOTRACES programme, was conducted along the French‐led section in the North Atlantic Ocean (Section GA01), between 15 May and 30 June 2014. In this talk, I will present an overview of the main results from GEOVIDE, including physical oceanography and trace element and isotope cyclings. The main GEOVIDE results have helped to improve our understanding of the TEI cycles in the North Atlantic. The strong physical oceanography background of the GEOVIDE project was a strength for interpreting our data. For many TEIs, a strong link was observed between their distributions and water masses. On the other hand, TEIs also helped to constrain oceanic circulation, notably in the subpolar gyre and Labrador Sea. Important sources (sediments, fluvial, and meteoric) and sinks (biological uptake and scavenging) of TEIs were highlighted. The biological carbon pump was studied and showed different efficiencies in the various studied regions.

 

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Jeudi 14 Février - Satellite dataset integration for terrestrial water cycle analysis and water storage change reconstruction

by SEMSOU last modified Jan 14, 2019 09:18 AM
When Feb 14, 2019
from 11:00 AM to 12:00 PM
Where salle Jules Verne
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Victor Pellet

Post-doctorant au LERMA-Observatoire de Paris et Estellus, Paris


Titre : Satellite dataset integration for terrestrial water cycle analysis and  water storage change reconstruction

 

Résumé : During the last decades, Earth Observations (EO) have increasingly been used to study global hydrology. However, using EO to study the water cycle is still a challenge, at the regional as at the global scale: EO suffer from numerous systematic and/or random errors and they are often not coherent with each other (Pellet and Aires. 2018). In particular, they generally do not close the water cycle budget. It is however possible to optimally merge several datasets for each component of the terrestrial water cycle to close this budget at the basin scale, using only EO and no model assimilation (Aires et al. 2014; Munier et al. 2015). When considering enough basins and associated river discharges to constrain a closed domain such as the Mediterranean region, it is possible to develop a dedicated integration technique that closes simultaneously the terrestrial, oceanic and atmospheric water cycle budgets (Pellet et al. 2019). Once a reference dataset is obtained to describe the water cycle in a hydrologically coherent way, it is possible to design an independent and simple calibration of each satellite dataset to reduce the overall budget residual, over long time series, and with the original EO spatial resolution. We show that this global calibration transforms the original datasets towards a consensus that is hydrologically more coherent, with reduced budget residuals (Pellet et al. 2019). This allows for instance for the reconstruction of a missing water component such (Munier et al. 2017). This approach has opened new perspectives to generate for example long-term estimate of the water storage change in the large Himalayan river basins (Pellet et al. in preparation). In this presentation, we will introduce these merging techniques and illustrates the concepts over the Mediterranean region and some major Asian basins.

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Vendredi 18 Janvier - Le SCOR, ses missions et les enjeux de l’Objectif Développement Durable 14

by SEMSOU last modified Dec 17, 2018 02:52 PM
When Jan 18, 2019
from 11:00 AM to 12:00 PM
Where salle Coriolis
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Marie-Alexandine Sicre

Présidente du SCOR &

Directrice de recherche CNRS au LOCEAN

 

Le SCOR, ses missions et les enjeux de l’Objectif Développement Durable 14 

 

Résumé: Le SCOR (Scientific Committee on Oceanic Research) est un comité interdisciplinaire de l’académie des sciences internationale (ex-ICSU devenu l’ISC) dont la mission est de promouvoir la recherche internationale en océanographie. Sa déclinaison française, le CNFRO, comité interdisciplinaire de l’académie des sciences en France, assure le lien entre le niveau national et international au sein du Cofusi. Dans la première partie de mon exposé je présenterai le SCOR, ses activités et notamment ses grands programmes de recherche (Geotraces, Imber, Solas mais aussi IQOE et IIEO-2), ses groupes de travail et ses partenariats sur l’observation de l’océan. J’aborderai ensuite ses actions de renforcement de capacité dans les pays en émergence et de diffusion de l’information scientifique. Je finirai par les enjeux à venir et notamment ceux de l’Objectif Développement Durable 14 (ODD14) de l’Agenda 2030 des Nations Unies, son implémentation à travers des mécanismes comme le Knowledge Action Network (KAN) de Future Earth-Ocean et la mise en place de La décennie de l’océan (2021-2030) par la commission océanographique intergouvernementale (IOC).

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