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Modelling surface currents in the Eastern Levantine Mediterranean using surface drifters and satellite altimetry

Abstract : We present a new and fast method for blending altimetry and surface drifters data in the Eastern Levantine Mediterranean. The method is based on a vari-ational assimilation approach for which the velocity is corrected by matching real drifters positions with those predicted by a simple advection model, while taking into account the wind effect. The velocity correction is done in a time-continuous fashion by assimilating at once a whole trajectory of drifters using a sliding time window. Except for the wind component, the velocity is constrained to be divergence free. We show that with few drifters, our method improves the the estimation of velocity in two typical situations: an eddy between the Lebanese coast and Cyprus, and velocities along the Lebanese coast.
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Submitted on : Tuesday, August 30, 2016 - 11:47:08 AM
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Leila Issa, Julien Brajard, Milad Fakhri, Daniel Hayes, Laurent Mortier, et al.. Modelling surface currents in the Eastern Levantine Mediterranean using surface drifters and satellite altimetry. Ocean Modelling, Elsevier, 2016, 104, pp.1-14. ⟨10.1016/j.ocemod.2016.05.006⟩. ⟨hal-01357669⟩

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