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Proceedings of the 9th International Conference on Physical and Mathematical Modelling of Earth and Environmental Processes. PMMEEP 2023

ISSN:2524342

2024

10.1007/978-3-031-54589-4_2

Based on the hydrodynamic model of the MHI, adapted to the conditions of the Black Sea coastal area with open boundaries, a numerical experiment was carried out to reconstruct the fields of currents and beryllium concentration with the assimilation of hydrological data and satellite sea surface temperature in the summer of 2016. We used a high spatial resolution (horizontal grid ~500 × 500 m). A higher spatial resolution allowed to reconstruct a submesoscale structure of the current fields in the upper and deep layers and to obtain quantitative and qualitative characteristics of the eddies and currents more accurately compared to calculations on a ~1.6 km grid. An increased radionuclide content was reproduced in the field of beryllium-7 concentration in the coastal zone of Yalta and in the Feodosiya Bay, associated in the first case with atmospheric precipitation, and in the second case with submesoscale dynamics. Reduced values were detected at the periphery of the Rim Current and near Cape Sarych. At the same time, it was possible to reconstruct the decrease in beryllium content near the southern tip of the Crimea, recorded by in-situ measurements, only with the help of the model with a resolution of ~500 m. The decrease in the concentration of beryllium-7 was associated with the formation of coastal upwelling, not reproduced by the model with a resolution of ~1.6 km.

Assimilation of observational data, Beryllium-7, Black Sea, High spatial resolution, Numerical modeling, Submesoscale eddies

2024-08-22 12:08:02