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Implementation of SWAN model with COSMO-CLM wind forcing for the Barents Sea storm events (case study)тезисы доклада
- Авторы: Vladimir PLATONOV, Stanislav MYSLENKOV
- Сборник: Book of abstracts of International Geographical Union Regional Conference “Geography, Culture and Society for Our Future Earth”, 17–21 August 2015, Moscow, Russia
- Серия: Thematic Session "Cultural Regionalism and Regional Identity"
- Тезисы
- Год издания: 2015
- Издательство: Izdatel'stvo Moskovskogo Gosudarstvennogo Universiteta im.M.V.Lomonosova/Publishing House of Moscow State University
- Местоположение издательства: Russian Federation
- Первая страница: 1452
- Последняя страница: 1452
- Аннотация: Polar lows are small, but fairly intense maritime cyclones, calling frequently extremely strong winds near seashores as well as storm surges, leading to considerable losses in coastal areas. Simulation and prediction of these severe weather events is very important and actual problem. A good resolving of such meso-scale objects and its dangerous consequences like extreme waves is possible using highresolution modeling only. It is relevant to regional atmospheric and wave models, which has resolution about first kilometers. Case study of polar low event and associated extreme waves in Barents Sea (region of Kara Strait) was examined using coupling between regional climate model COSMO-CLM and SWAN wave model. COSMO-CLM is non-hydrostatic limited-area atmospheric model has developed by DWD (Deutscher Wetterdienst, Germany Weather Service). The COSMO-Model is based on the primitive thermohydrodynamical equations describing compressible flow in a moist atmosphere. The model equations are formulated in rotated geographical coordinates and a generalized terrain following height coordinate. A variety of physical processes are taken into account by parameterization schemes. The wave modeling based on the SWAN (Simulating WAves Near shore) spectral wave model. This model simulates parameters of wind waves in the open sea and coastal areas successfully. Computations were performed by using special unstructured mesh, which include the Barents and Kara seas with spatial resolution around 3 km. We are expecting this high-resolution coupling could be a good opportunity for better and more accurate resolving the spatio-temporal distribution of wind and therefore, extreme wave parameters. It is associated with detailed description of orography, sub-grid atmospheric processes, especially in planetary boundary layer, turbulence etc. in regional atmospheric model in comparison with global model outputs or global reanalysis field. These features are very important for more realistic and extensive wave structure modeling, particularly the extreme ones. Experiments were realized using the Supercomputing Center of Lomonosov Moscow State University. The experiment was executed for the period of 26 October – 2 November 2000. Initially, the first regional climate model run was implemented on 18 km resolution over the large area of Barents, Baltic, Norway seas and surrounding waters. The comprehensive ERA-Interim reanalysis forcing used as driving fields. The next run was executed in downscaling mode from 18 km COSMO-CLM output to 2.8 km resolution domain over the Barents Sea area only. Then COSMO-CLM 2.8 km output wind forcing was used as driving fields for SWAN wave model. Simulation of this case has shown the significant improvement of some characteristics. For example, it was shown that COSMO-CLM forcing provides significant wave height higher than 5 m in comparison with the wave from reanalysis ERA-Interim, which is only 4 m. Thus, the technique of high-resolution coupling between regional atmospheric and wave models could well reproduce extreme events, such as polar lows, and its main features like strong winds, pressure and temperature as well as ocean wave distribution. The further development and adaptation of this technique and its approbation on other case studies will tend to improve simulation results.
- Добавил в систему: Платонов Владимир Сергеевич