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The surface distribution of light attenuation due to particles (c) as well as chlorophyll-a and gelbstoff fluorescence (F_ch and F_cd, respectively) were recorded during an OMEGA (EU funded, MAST III project) cruise in the northwestern Alborán Sea through a high spatial (zonally separated by 10 km and virtually meridionally continuous) and temporal (about 3 days between each of the three repeated surveys made in the zone) resolution sampling design. The distributions obtained for these variables were tightly linked to the physical forcing at the different scales that the sampling design was able to resolve. Low values dominate the quasi permanent anticyclonic gyre occupying the western Alborán Sea, whereas the frontal zone directly affected by the entrance of the Atlantic jet depicts much higher records for c, F_ch and F_cd.

High geostrophic Froude numbers in the jet, and the subsequent increase in turbulence …