VANIMEDAT project
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VANIMEDAT project : Decadal and interdecadal sea-level variability in the Mediterranean sea and northeastern Atlantic ocean. A. Pascual 1 , M. Marcos 2 , S. Ruiz 1 , D. Gomis 1 , S. Monserrat 1 , E. Alvarez 3 , B. Pérez 3 , M. G. Sotillo 3 , G. Larnicol 4 , M. N. Tsimplis 2

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Vanimedat project

VANIMEDAT project:

Decadal and interdecadal sea-level variability in the Mediterranean sea and northeastern Atlantic ocean

A. Pascual1, M. Marcos2, S. Ruiz1, D. Gomis1, S. Monserrat1, E. Alvarez3, B. Pérez3, M. G. Sotillo3, G. Larnicol4, M. N. Tsimplis2

e-mail: [email protected]

1 IMEDEA (CSIC-UIB), Balears, SPAIN,

2 NOC, National Oceanographic Center, Southampton, UK

3 Puertos del Estado, Madrid, SPAIN

4 CLS Space Oceanography Division, Toulouse, FRANCE

1. Objectives of VANIMEDAT project

3. Preliminary results

GENERAL OBJECTIVE:

Study of decadal and interdecadal sea-level variability in the seas surrounding the Iberian peninsula. (Project funded by the Spanish Ministry of Science and Education)

SPECIFIC OBJECTIVES:

a) Characterization of the spatial and temporal sea-level variability.

b) Quantification, at a regional scale, of the different mechanisms that drive sea-level variability.

c) Estimation of ocean mass increase.

MODEL INTERCOMPARISON (1993-2001)

HAMSOM

MOG2D

Barotropic sea level variance from each model.

TIDE GAUGE VARIANCE REDUCTION (1993-2001)

2. Data and models

Ratio of variance reduction at tide gauges

([Var(TG-IB)-Var(TG-model)]/Var(TG-IB), in %, for all frequencies (left), LF (>20 days, centre) and HF (<20 days, right).

  • Tide gauge data:

  • Hourly and monthly data.

  • Period:(~1900-2006).

  • Tides are filtered and atmospheric correction

    (IB/MOG2D/HAMSOM) is applied.

TIDE GAUGES VS ALTIMETRY (1993-2001)

HAMSOM

(Top) Position of gauges (hourly data) used for the comparison with altimetry.

MOG2D

  • Altimetry data:

  • Along-track processing:

    • Atmospheric correction: (IB/MOG2D/HAMSOM)

    • Usual other corrections

  • Objective analysis:

    • Long wavelength error corrected.

    • Weekly maps, 1/4º.

    • Period: 1993-present

Left: Dubrovnik tide gauge (blue) and altimetry (red) time series corrected by HAMSOM (top) and MOG2D (bottom). Right: Ratio of variance reduction of the differences between altimetry and tide gauge

([Var(TG-alti)|model-Var(TG-alti)|]/Var(TG-alti)|IB.

TP

Jason

ERS-1/2

SEA LEVEL TRENDS FROM ALTIMETRY

ALTI_MOG2D

1993-2006

ALTI_MOG2D

1993-2001

ENVISAT

Barotropic sea level models:HAMSOM

MOG2D

Baroclinic model:

to be run in the framework of VANIMEDAT project.

mean = 5.63 mm/yr mean = 2.90 mm/yr

ALTI_HAMSOM

1993-2001

ALTI_IB

1993-2001

mean = 5.39 mm/yr mean = 5.48 mm/yr

4. Ongoing and future work

Configuration of the barotropic models.

  • Combination of tide gauge and altimetry data to reconstruct sea level in the last century.

  • Characterization of heat fluxes from REMO.

  • To run a baroclinic numerical model to extract the steric component.

  • Use of GRACE and GOCE data to extract the mass component.

GRACE

GOCE


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