Internal Tidal Hydrodynamics and Ambient Characteristics of the Adriatic (ITHACA)
Technical rept. 12 Apr-31 Dec 2005
ZAGREB UNIV (CROATIA)
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Analysis of historical data has shown that in the middle Adriatic area strong cyclonic activity supports different weather types in winter, with frequent exchange of Sirocco and Bora events. During summer, this area is under the influence of subtropical high-pressure belt and consequently warm and dry weather conditions prevail. Sea temperatures at various depths of the Split-Gargano transect are characterized by isothermal conditions in late autumn and winter and rather small changes at 100 meters where the temperature does not fall below l20 deg C. Salinities are minimal in the surface layer, most so in May and July. Analytical modeling, based on separate equations for the barotropic and baroclinic modes of the two-layer fluid contained in rectangular channel with a step-like topography, has allowed for both the progressive and standing surface waves. It pointed to the relationship between amplitude of internal tides on one hand and amplitude of surface tides, depth of the shelf and deep-sea regions, pycnocline depth and density difference between the two layers on the other. The results described in the present report have helped to define the precise positions of the ITHACA measurement points and thus to prepare for the start of experimental work in February 2006.
- Physical and Dynamic Oceanography