The experimental data collected in course of the present study will be used for comparative analysis of 3 approaches to the Ocean Acoustic Tomography, namely: Traditional (Moored) Tomography, Dynamic Tomography and Matched Field Tomography using multi-element arrays. The particular topics of research are:
The initial Work Programme of the present project submitted to INTAS in 1993 provided for 2-year research which included both field experiments on 3 different approaches to the Ocean Acoustic Tomography, and data inversion and comparison of the results. The project finally supported by INTAS included only the first part. The outcome of this investigation is presented in the current report. We plan to continue the study along the above mentioned lines. For this purpose we plan to apply for continuation of this project and hope that its second year, which originally was not approved, will really take place. The work will be also continued in the framework of domestic Russian project RFBR # 95-05-14616.
The scientific contacts and fruitful cooperation established between Russian and European partners in course of this project will be continued. The same team (with minor replacements) has submitted a research proposal to the Joint INTAS and RFBR Call of 1995. The proposal entitled ``A new, full-field approach to acoustic tomography of ocean currents in the coastal zone'' is devoted to acoustic monitoring of water fluxes between the Atlantic ocean and the Mediterranean through the Strait of Gibraltar. The application was approved for funding, the project reference number is INTAS-RFBR 95-1002.
One more area of planned collaboration is related with analysis of the collected CTD and IR data and further studies of the observed Weddy. The inhomogeneity surveyed during our trial proved to be an interesting mezoscale feature, which, to our present knowledge, has not been observed before in the area and season of the measurements. Its origin and life-span, as well as contribution of such eddies to the circulation processes in the Western Mediterranean basin should be studied. The work is carried on by the Russian oceanographic team (Drs. E. A. Plakhin, D. L. Aleynik with contribution from acousticians of P.P.Shirshov Institute) and our French colleagues Drs. C. Millot and J.-L. Fuda. On the first stage, the analysis of the in situ and remotely sensed data already collected about the Weddy will be finished. The results of the 2 methods will be compared to develop the optimal scenario of the future search. The second step will be to conduct a dedicated at-sea experiment to catch a new event of such inhomogeneity.