Artículo| Año: | 2017 |
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| Autor(es): | G. Jordà, A. Sánchez-Román, D. Gomis |
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| Título: | Reconstruction of transports through the Strait of Gibraltar from limited observations |
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| Revista: | CLIMATE DYNAMICS |
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| ISSN: | 0930-7575 |
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| JCR Impact Factor: | 3.774 |
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| Volumen: | 48 |
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| Número: | 3-4 |
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| Páginas: | 851-865 |
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| D.O.I.: | 10.1007/s00382-016-3113-8 |
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| Web: | https://link.springer.com/article/10.1007/s00382-016-3113-8 |
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| Resumen: | Observing
the water transports through the Strait of Gibraltar is a difficult
task. Here we present a methodology aimed to obtain the inflow, outflow
and net transport of water from the limited set of available
observations, currently consisting of an upward looking ADCP deployed at
Espartel sill, two tide gauges located at each side of the Strait and
radars monitoring the surface velocities. More precisely, we reconstruct
the velocity field over a vertical section across the Strait using a
reduced order optimal interpolation technique fed with the spatial
covariance patterns deduced from high resolution numerical simulations.
As a first step we carry out some sensitivity experiments with synthetic
data that demonstrate the high potential of the approach. The
reconstruction methodology can reproduce very satisfactorily the
variability of the transports with estimated correlations for the
inflow, outflow and net over 0.9 in all the cases and estimated RMS
errors of 0.03, 0.08 and 0.05 Sv, respectively. However, we have also
found that the reconstruction is sensible to bias problems, mostly due
to the sensitivity of the method to the differences between the
statistics of the actual and modeled velocity profiles. The sensitivity
experiments have been used to tune the parameters of the method and a
reconstruction of actual monthly transports has been performed for the
period 2004–2010 along with an estimate of the associated uncertainty.
This reconstruction provides for the first time a multiannual time
series of the inflow and the net transports solely based on in situ
observations. Therefore it can be used as an independent estimate for
the validation of numerical models and surface freshwater fluxes in the
Mediterranean. |
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Personal relacionadoDamià Gomis BoschAntonio Jesus Sanchez RomanGrupos de investigación relacionadosTecnologías Marinas, Oceanografía Operacional y Costera
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