Analysis of riverine suspended particulate matter fluxes (Gulf of Lion, Mediterranean Sea) using a synergy of ocean color observations with a 3-D hydrodynamic sediment transport model
| Type | : | ACL |
|---|---|---|
| Nature | : | Production scientifique |
| Au bénéfice du Laboratoire | : | Oui |
| Statut de publication | : | Publié |
| Année de publication | : | 2015 |
| Auteurs (3) | : | LE FOUEST Vincent CHAMI Malik VERNEY Romaric |
| Revue scientifique | : | Journal of Geophysical Research-Oceans |
| Volume | : | 120 |
| Fascicule | : | 2 |
| Pages | : | 942-957 |
| DOI | : | 10.1002/2014jc010098 |
| URL | : | <go to isi>://wos:000352154800022 |
| Abstract | : | The export of riverine suspended particulate matter (SPM) in the coastal ocean has major implications for the biogeochemical cycles. In the Mediterranean Sea (France), the Rhone River inputs of SPM into the Gulf of Lion (GoL) are highly variable in time, which severely impedes the assessment of SPM fluxes. The objectives of this study are (i) to investigate the prediction of the land-to-ocean flux of SPM using the complementarity (i.e., synergy) between a hydrodynamic sediment transport model and satellite observations, and (ii) to analyze the spatial distribution of the SPM export. An original approach that combines the MARS-3D model with satellite ocean color data is proposed. Satellite-derived SPM and light penetration depth are used to initialize MARS-3D and to validate its predictions. A sensitivity analysis is performed to quantify the impact of riverine SPM size composition and settling rate on the horizontal export of SPM. The best agreement between the model and the satellite in terms of SPM spatial distribution and export is obtained for two conditions: (i) when the relative proportion of "heavy and fast'' settling particles significantly increases relative to the "light and slow'' ones, and (ii) when the settling rate of heavy and light SPM increases by fivefold. The synergy between MARS-3D and the satellite data improved the SPM flux predictions by 48% near the Rhone River mouth. Our results corroborate the importance of implementing satellite observations within initialization procedures of ocean models since data assimilation techniques may fail for river floods showing strong seasonal variability. |
| Mots-clés | : | northern adriatic sea rhone river organic-matter term changes part i water coastal ecosystem impact shelf Oceanography |
| Commentaire | : | ISI Document Delivery No.: CE9HM Times Cited: 0 Cited Reference Count: 53 Le Fouest, Vincent Chami, Malik Verney, Romaric French space agency "Centre National d'Etudes Spatiales-CNES'' Vincent Le Fouest was supported by a research fellowship from the French space agency "Centre National d'Etudes Spatiales-CNES''. The authors also wish to thank, by alphabetic order, David Doxaran, Bernard Gentili, Claire Neil, and Thomas Lorthiois from the Laboratoire d'Oceanographie de Villefranche for having kindly provided in situ data and satellite image processing and Fabrice Ardhuin (IFREMER) for providing WW3 wave archive. IFREMER and NASA are gratefully acknowledged for having provided the MARS-3D model and the MODIS level 1 data. We are grateful to the reviewers for their relevant comments and suggestions which were helpful to improve the quality of the manuscript. The data for this study are available from the corresponding author at email address: vincent.le_fouest@univ-lr.fr. 0 Amer geophysical union Washington Oceanography |
| Tags | : | - |
| Fichier attaché | : | - |
| Citation | : |
Le Fouest V, Chami M, Verney R (2015) Analysis of riverine suspended particulate matter fluxes (Gulf of Lion, Mediterranean Sea) using a synergy of ocean color observations with a 3-D hydrodynamic sediment transport model. J Geophys Res-Oceans 120: 942-957 | doi: 10.1002/2014jc010098
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