Presentation is loading. Please wait.

Presentation is loading. Please wait.

AMANDES research project PI: C. Jeandel-P.Seyler 4 french joint labs IRD/CNRS/Univ. Brasilian cooperations: UnB, UFF, USP (IO, IPEN) Processo CNPq n° 492685/2004-5.

Similar presentations


Presentation on theme: "AMANDES research project PI: C. Jeandel-P.Seyler 4 french joint labs IRD/CNRS/Univ. Brasilian cooperations: UnB, UFF, USP (IO, IPEN) Processo CNPq n° 492685/2004-5."— Presentation transcript:

1 AMANDES research project PI: C. Jeandel-P.Seyler 4 french joint labs IRD/CNRS/Univ. Brasilian cooperations: UnB, UFF, USP (IO, IPEN) Processo CNPq n° / Measures and models Weathered flux, LMTG Exchanged flux, LEGOS CEREGE Measures and models, POC, Legos/LA Amandes Andines OuestEst Impact of the Amazone discharge on the Atlantic chemistry?

2 AMANDES (AMazone-ANDES): Main questions OUR APPROACH: Coupling dynamic/ geochemistry/ modeling/ satellite data assimilation Continuum continent-estuary-shelf-ocean  Constrain the nature, transformations and dispersion into the ocean of the fluxes of “trace elements and isotopes (TEIs)” weathered from the Andine mountains  Improve the modeling of the dynamical circulation shelf/slope/open ocean In order to better quantify - fresh water transport and its impact on the regional circulation - tidal effects on this transport, re-suspension and sediment re-distribution - impact of these dynamics on the chemical element transformation/dispersion  Quantify the impact of these fluxes on the chemical composition of the open ocean waters off the Amazone mouth, simultaneously constrained by the coastal and western boundary current dynamics

3 Contribution of the time series HyBAm to AMANDES 1- Temporal variability of the TEIs at Obidos 2 - Propagation of the tide wave in the estuary, down Obidos Institut de Recherche pour le Développement

4 Area selected for the study of oceanic tide waves propagation. Triangular symbols indicate hydrometric stations. The longer side of the rectangle is about 1200 km long Study Area

5 Amandes project Hydrodynamics of the shelf/estuary/river system F. Lyard, Y. Le Bars, R. Belmiro LEGOS, CNRS, Toulouse Univ. Sao Paolo

6 Approach Multi-scale dynamics: from the global ocean circulation to the Amazon river flow and backward 2D/3D hydrodynamic model, unstructured grid modelling 1st step (2D): Tides, storm surges, river flow 2nd step (3D): Shelf circulation, river plume, open ocean outflow

7 Unstructured grid Necessary to describe the regional, estuary and river channels details

8 Amazon river’s shelf dynamical issues It is a macro-tidal zone It is connected to the north brazil current system It has the world-largest fresh-water discharge The estuary is 500 km wide, with complex channels connections and semi-permeable shores (mangroves) Tidal waves propagate inside the river up to Obidos (500 km upstream) due to the profound river bed Sediment transport and erosion is responsible for time-varying shorelines and bathymetry at the river mouth Bottom rugosity is strongly affected by sediment transport and re- suspension (mud lens)

9  CO 2, nutrients, oxygen: carbonate chemistry of the waters (N. Lefèvre, LOCEAN and T. Meziane, Lille)  Radium isotopes (226Ra, 228Ra and 224Ra, 233Ra): Tracers of continent-shelf-open ocean exchange process, submarine groundwater (Van Beek LEGOS, De Oliveira, USP) Nd and iron isotopes: Tracers of sources and exchange processes (Jeandel, Lacan, LEGOS) Lead isotopes: Tracers of sources and exchange processes (Hamelin, Claude, CEREGE) 210 Pb, 7 Be, 234 Th: Tracers sedimentation rates, coastal/open ocean processes (Radakovitch, CEREGE) 9 Be/ 10 Be: Tracers of weathering processes (Hamelin and Bourlès, CEREGE; Seyler, LMTG) Hg and REE speciation: tracers of processus and contaminants (J. Sonke, L.Maurice-B., P. Seyler, P. Moreira-T, LMTG; UnB, ANA (+ CPRM), UFRJ (COPPE) Which tracers will be measured?

10 ADCP de fond P1 P3 P4 P6P6 P7P7 P9 1x couranto+S+T 2x couranto+S+T Para-S0 Amaz-S0 Strategy and sampling, on the shelf: 4 cruises Oct-Nov 2007, jan 2008, march 2008, July 2008, R/V ANTEA, IRD  9 mooring lines, including 3 ADCP at the break of the shelf (100m depth)  Bathymetry (historical and new data)  Tide gauges (shelf and estuary)  Water sampling: dissolved and solid phases, filtration and ultra-filtration on board, 3 depths.  Large volumes: numerous TEIs  Multi-coring, interstitial waters  Radiometer

11 Our wishes, as a follow-up to Amandes …but no research vessel so far! Goal: quantify the impact of the Amazon inputs on the Atlantic ocean chemistry Could be part, or the starting point of a Geotraces section.


Download ppt "AMANDES research project PI: C. Jeandel-P.Seyler 4 french joint labs IRD/CNRS/Univ. Brasilian cooperations: UnB, UFF, USP (IO, IPEN) Processo CNPq n° 492685/2004-5."

Similar presentations


Ads by Google