A SYNTHESIS OF THE LEVANTINE BASIN CIRCULATION AND HYDROGRAPHY, 1985-1990

The Levantine Basin circulation derived from recent data consists of a series of sub-basin-scale to mesoscale eddies interconnected by jets. The basin-scale circulation is masked by eddy variability that modula tes and modifies it on seasonal and interannual time scales. Long-term qualitative changes in the circulation are reflected in the bifurcati on patterns of the mid-basin jets, relative strengths of eddies and th e hydrographic properties at the core of these eddies. Confinement wit hin the Basin geometry strongly influences the co-evolution of the cir culation features. Surface measurements, satellite images and the mass field indicate an entire range of scales of dynamical features in the region. The complexity of the circulation is consistent with the basi n-wide and mesoscale heterogeneity of the hydrographic properties. The interannual variability of LIW (Levantine Intermediate Water) formati on in the region appears correlated with the changes in the circulatio n. Wintertime convective overturning of water masses reach intermediat e depths and constitute a dominant mechanism of LIW formation, especia lly in anticyclonic eddies and along the coasts of the northern Levant ine Basin.