circulation patterns of the southern bay of biscay during a winter-spring transition period

CIRCULATION PATTERNS OF THE SOUTHERN BAY OF BISCAY DURING A WINTER-SPRING

TRANSITION PERIOD

Paula Conde PardoInstituto Español de Oceanografía. Centro Oceanográfico de A Coruña

Area Galician - Cantabrian Shelf & Slope

Resolution aimed at ecosystem studies (1-2 km). High-resolution forcing.

Impact on ecosystems.

Operational forecasts (ESEOO project).

paulaadm

SASEMARAccidentes en barcos (hombre al agua) suelta de alijos

Complex bathymetry• Water masses

• Upwelling / Downwelling processes

• Mesoscale structures

• Slope Current

paulaadm

Spanish Deep Standard Sections

ROMS (Regional Ocean Modelling System, Haidvogel et al., 2002) with nesting capability (Penven et al., 2004).

Three grids with 15Km, 5Km and 1.8Km.

30 vertical s-layers.

OSU tidal inverse model (Egbert and Erofeeva, 2002).

Wind forcing & Heat fluxes (MM5: 30Km, 1h; HIRLAM02: 22km, 6h; NCEP 2º, 6h).

paulaadm

Ongoing nesting in diferent grids with other modelsmeteorological forcing : also INM has HIRLAM016 freq 1h

River run-off

Slope Current

Interaction Coastal – Ocean dynamics Mesoscale features

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IEO Local Model (ROMS)

ESEOO Project

• Participants:

• Main Objective:

Data Analysis:

Operational Oceanographic System

Numerical Models:

Historical

Real Time

Physical variables Trajectories Regional & Local

paulaadm

Answer to emergencies in the ocean (oil spills, mooring objets..). Combination of services.Historical Data & Real time DataPrediction of Oceanographic and Metereological variables (wind, currents, SST, waves, Sea Level). Trends (Trajectories) of oill spills or mooring objects.

Exercise Gijón

ESEOO Project

• Emergency state

• Operational model

forecasts

• Cruises

• Lagrangian Buoys

USYP

paulaadm

USYP Prevention and Surveying UnitWe are able to produce Operational model forecastingLagrangian buoys testing modelsCruises to study in more ditail and after the exercise the model results

Exercise Gijon: Cruises

On board IEO RV “José Rioja”

28 CTD stations

Cruise I 24th – 25th May

Cruise II 28th – 29th May

Cruise I: 24th-25th May

** Hourly meteorological forecasts: - MM5 30 km during spin-up (3 months before) - NCEP & HIRLAM02 (INM) during the exercise

Wind stress over the shelf

Salinity

paulaadm

Estimations for Nalon river based in April dataTidal forcing: OSU tidal inverse model (Egberta nad Erofeeva, 2002) Nested grid approach at the OB. Ongoing effort in nesting to ESEOOATRelaxation of a westerly wind pulsePoleward surface slope flow relaxesRiver plumes confine to the inner shelf during the pulse and expand in the relaxation

Cruise I: Vertical Sections

SalinityTemperature

Cruise I: CTD Profiles

SlopeOuter ShelfIntermediate ShelfInner Shelf

Cruise II: 28th-29th MayWind stress over the shelf

Salinity

Cruise II: Vertical SectionsSalinityTemperature

Cruise II: CTD Profiles

SlopeOuter Shelf

Intermediate Shelf

Inner Shelf

Exercise Gijon : Lagrangian BuoysWind stress over the shelf

Wind stress over the shelf

Currents: Boya Cape Peñas

Conclusions:

Bathymetry

Wind Forcing

River Plumes

Water masses

Accurate Bathymatry Data in the Shelf

Spreading / Confinement River Plumes

High Frecuency (6h, 1h)

Climatological Run-off. Need for daily values

Effects in Dynamics

Slope Current Strength

Upwelling / Downwelling events

Shelf dynamics

Upwelling / Downwelling events IPC – River run-off interaction

OB Bathymetry

Climatology Higher Resolution Bathimetry

circulation patterns of the southern bay of biscay during a winter-spring transition period

Documents

vertical slayers

relaxation cruise

ctd stations cruise

bathymetry wind

model resultsexercise

paulaadm ongoing nesting

highresolution forcing

nalon river