References

Ocean Science

Ocean Sci.

1812-0792

Copernicus Publications

Göttingen, Germany

10.5194/os-7-793-2011

Operational forecast of hydrophysical fields in the Georgian Black Sea coastal zone within the ECOOP

Kordzadze

A. A.

¹ Demetrashvili

D. I.

M. Nodia Institute of Geophysics, Iv. Javakhishvili Tbilisi State University, 1, M. Alexidze Str., 0173 Tbilisi, Georgia

25 11 2011

7 6 793 803

2011

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One of the parts of the Black Sea Nowcasting/Forecasting System is the regional forecasting system for the easternmost part of the Black Sea (including the Georgian water area), which has been developed within the context of the EU International projects ARENA and ECOOP. A core of the regional system is a high-resolution baroclinic regional model of the Black Sea dynamics developed at M. Nodia Institute of Geophysics (RM-IG). This model is nested in the basin-scale model of Marine Hydrophysical Institute (MHI, Sevastopol/Ukraine). The regional area is limited to the Caucasian and Turkish coastal lines and the western liquid boundary coinciding with the meridian 39.36° E. Since June 2010 we have regularly been computing 3 days' forecasts of current, temperature and salinity for the easternmost part of the Black Sea with 1 km spacing. In this study the results of two forecasts are presented. The first forecast corresponds to summer season and covers the prognostic interval from 00:00 h, 6 August to 00:00 h, 9 August 2010. The second one corresponds to autumn season and covers the prognostic interval from 00:00 h, 26 October to 00:00 h, 29 October 2010. Data needed for the forecasts – the initial and prognostic hydrophysical fields on the open boundary, also 2-D prognostic meteorological fields at the sea surface – wind stress, heat fluxes, evaporation and precipitation rates for our regional area are being placed on the MHI server every day and we are available to use these data operatively. Prognostic hydrophysical fields are results of forecast by the basin-scale model of MHI and 2-D meteorological boundary fields represent the results of forecast by regional atmospheric model ALADIN. All these fields are given on the grid of basin-scale model with 5 km spacing and with one-hour time step frequency for the integration period. The analysis of predicted fields shows that to use the model with high resolution is very important factor for identification of nearshore eddies of small sizes. It should be noted the very different character of regional circulation in summer and autumn seasons in the easternmost part of the Black Sea.

References 1

Berlyand, G. G.: Method of climatological calculation of the net radiation (in Russian), Meteorologia i gidrologia, Moscow, 6, 9–12, 1960.

Besiktepe, S. T.: Development of the regional forecasting system for the Black Sea, Proceed. of the "Second International Conference on Oceanography of Eastern Mediterranean and Black Sea: Similarities and Differences of Two Interconnected Basins", Ankara, Turkey, 14–18 October, 2002, 297–306, 2003.

Demetrashvili, D. I., Kvaratskhelia, D. U., and Gvelesiani, A. I.: On the vortical motions in the Black Sea obtained by the 3-D hydrothermodynamical numerical model, Adv. Geosci., 14, 295–299, <a href="http://dx.doi.org/10.5194/adgeo-14-295-2008">https://doi.org/10.5194/adgeo-14-295-2008</a>, 2008.

Demyshev, S. G. and Korotaev, G. K.: Numerical energy-balanced model of baroclinic currents in the ocean with bottom topography on the C-grid, in: Numerical Models and Results of Intercalibration Simulations in the Atlantic Ocean, edited by: Sarkisyan, A., Moscow, 163–231, 1992 (in Russian).

Jaoshvili, Sh. V.: The river alluvium and the beach formation of the Georgian Black Sea coast, Tbilisi, 155 pp., 1986 (in Russian).

Kordzadze, A. A.: Mathematical Problems of Solving Problems of Ocean Dynamics, VTs SO AN SSSR, Novosibirsk, 148 pp., 1982 (in Russian).

Kordzadze, A. A.: Mathematical modelling of sea currents (theory, algorithms, numerical experiments), Moscow, OVM AN SSSR, 218 pp., 1989 (in Russian).

Kordzadze, A. A. and Skiba, Yu. N.: Numerical calculations of the Black Sea with a three-dimensional model, Preprint, Computer Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, 32 pp., 1973 (in Russian).

Kordzadze, A. A. and Demetrashvili, D. I.: Numerical modeling of inner-annual variability of the hydrological regime of the Black Sea with taking into account of alternation of different types of the wind above its surface, Proceed. of Intern. Conference: "A year after Johanesburg-Ocean Governance and Sustainable Development: Ocean and Coasts – a Glimpse into the Future". Kiev, Ukraine, October 27–30, 2003, 495–505, 2004.

Kordzadze, A. and Demetrashvili, D. I.: Simulation and forecast of hydrophysical fields in the part of the Georgian Black Sea coastal zone, J. Georgian Geoph. Soc., 12, 7–16, 2008.

Kordzadze, A. and Demetrashvili, D. I.: Modeling of dynamical processes in the Black Sea, Georgian Electronic Scientific Journal (GESJ): Physics, 1, 25–45, <a href="http://gesj.internet- academy.org.ge/phys/">http://gesj.internet- academy.org.ge/phys/</a>, 2010.

Kordzadze, A. A., Demetrashvili, D. I., and Surmava, A. A.: Numerical modeling of hydrophysical fields of the Black Sea under the conditions of alternation of atmospheric circulation processes, Izvestiya RAS, Atmospheric and Oceanic Physics, 44, 213–224, 2008.

Korotaev, G. K. and Eremeev, V. N.: Introduction in operative oceanography of the Black Sea, Sevastopol, HPC "EKOCI-Gidrofizika", 382 pp., 2006 (in Russian).

Korotaev, G., Oguz, T., Nikiforov, A., and Koblinsky, C.: Seasonal, interannual, and mesoscale variability of the Black Sea upper layer circulation derived from altimeter data, J. Geophys. Res., 108, 3122, <a href="http://dx.doi.org/10.1029/2002JC001508">https://doi.org/10.1029/2002JC001508</a>, 2003.

Korotaev, G., Cordoneanu, E., Dorofeev, V., Fomin, V., Grigoriev, A., Kordzadze, A., Kubriakov, A., Oguz, T., Ratner, Yu., Trukhchev, D., and Slabakov, H.: Near-operational Black Sea nowcasting/forecasting system, in: European Operational Oceanography: Present and Future, 4th EuroGOOS Conference, 6–9 June 2005, Brest, France, 269–275, 2006.

Kubryakov, A., Grigoriev, A., Kordzadze, A., Korotaev, G., Trukhchev, D., and Fomin, V.: Nowcasting/Forecasting subsystem of the circulation in the Black Sea nearshore regions, in: European Operational Oceanography: Present and Future, 4th EuroGOOS Conference, 6–9 June 2005, Brest, France, 605–610, 2006.

Marchuk, G. I.: Numerical methods in weather prediction, Leningrad Gidrometeoizdat, 353 pp., 1967 (in Russian).

Marchuk, G. I.: Numerical Solution of Problems of Atmospheric and Oceanic Dynamics, Gidrometeoizdat, Leningrad, 303 pp., 1974 (in Russian).

Marchuk, G. I. and Kordzadze, A. A.: Perturbation theory and the formulation of inverse problems of ocean dynamics, Proceedengs of Tbilisi State University, Mathematica, Mekhanica, Astronomia, 259, 49–65, 1986 (in Russian).

Marchuk, G. I., Kordzadze, A. A., and Skiba, Yu. N.: Calculation of major hydrological fields of the Black Sea on the basis of the splitting method, Izvestiya USSR, Atmos. Ocean. Phys., 11, 379–393, 1975.

Marchuk, G. I., Kordzadze, A. A., and Zalesnyi, V. B.: Problem of mathematical modelling of sea and ocean currents, in: Differential and Integral Equations: Boundary-Value Problems, Tbilisi, 99–151, 1979 (in Russian).

Marchuk, G. I., Kochergin, V. P., Sarkisyan, A. S., Bubnov M. A., Zalesny, V. B., Klimok, V. I., Kordzadze, A. A., Kuznetsov, V. I., Protasov, A. B., Sukhorukov, B. A., Tsvetova, E. A., and Scherbakov, A. B.: Mathematical models of ocean circulation , Nauka, Novosibirsk, 288 pp., 1980 (in Russian).

Oguz T., Latun, V. S., Latif, M. A., Vladimirov, V. V., Sur, H. I., Markov, A. A., Ozsoy, E., Kotovshchikov, B. B., Eremeev, V. V., and Unluata, U.: Circulation in the surface and intermediate layers in the Black Sea, Deep. Sea Res., 40, 1597–1612, 1993.

Stanev, E., Truhchev, D., and Roussenov, V.: The Black Sea circulation and its numerical modelling, Sofia, Kliment Ohridski, 222 pp., 1988 (in Russian).

Sukhonosov, V. I.: On the correctness as a whole of a 3D problem of ocean dynamics, in: Mechanics of Inhomogeneous Continuous media, Computer Center, Siberian Branch of Russian Academy of Sciences, Novosibirsk, 52, 37–53, 1981 (in Russian).

Zilitinkevich, S. S. and Monin, A. S.: Turbulence in Dynamic Models of the Atmosphere, Nauka, Leningrad, 41 pp., 1971 (in Russian).