Modeling meso- and sub-mesoscale circulation along the eastern Crimean coast using numerical calculations

Демышев, С. Г.; Evstigneeva, N. A.

doi:10.1134/s0001433816050042

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…In this approach, important features of coastal zones are not taken into account at the grid nodes located close to the coast. This introduces inaccuracy in the modeling results [7]. Therefore, the refinement of data on the sea depths for more accurate description of hydrophysical fields seems to be an urgent task.…”

Section: Introductionmentioning

confidence: 99%

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

Дымова¹,

Miklashevskaya²

2019

PhO

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Accuracy of the reconstructed hydrophysical fields calculated using different data on bottom topography is estimated in order to determine the depth array corresponding to the modern tasks of the Black Sea circulation modeling with high spatial resolution. Methods and Results. Two numerical experiments on modeling the circulation were carried out based on the Marine Hydrophysical Institute, Russian Academy of Sciences (MHI RAS) ocean model. Horizontal resolution was 1.6 km, 27 irregular z-horizons were preset vertically and the SKIRON/Eta data (2011) were used as the atmospheric forcing for both cases. Difference between the experiments consisted in application of different bathymetry. In the first experiment, the bottom topography was preset in accordance with the Black Sea depths from the MHI Ocean Data Bank with the 5-minute resolution; in the second onebased on the European Marine Observation and Data Network (EMODnet) depth array with the 1/8ꞌ resolution. The calculated hydrophysical fields were compared with the temperature and salinity measurements, and satellite images of the sea surface temperature. The analysis showed that application of the depths data of higher resolution permitted to improve accuracy of thermohydrodynamic characteristics of the Black Sea circulation in the 30-300 m layer. The integral values of the eddy kinetic energy and the mean current kinetic energy for two experiments were also considered for both of the experiments. The results of the comparative analysis demonstrate the fact that, at the bottom topography with higher resolution taken into account, in the simulated system the mechanisms of energy redistribution between currents and eddies changed during intensive storm impacts. Conclusions. The results of the present research permit to conclude that in the experiment with a smoother bottom relief, increase of kinetic energy both of the eddies and currents was due to barotropic instability. In case of more complex bathymetry, the eddy kinetic energy increased mainly owing to the processes associated with baroclinic instability.

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Section: Introductionmentioning

confidence: 99%

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

Дымова¹,

Miklashevskaya²

2019

PhO

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“…Submesoscale dynamics are actively investigated in the Black Sea using in-situ [4,15], satellite [9,10,[16][17][18][19][20][21], and numerical modeling data [22][23][24]. These investigations demonstrate that the orbital velocity of small SEs with a radius of 1-5 km may reach 0.1-0.2 m/s, while their Rossby number is about 1f [4,10], which can sometimes reach more than 10f according to drone measurements [6].…”

Section: Introductionmentioning

confidence: 99%

Accumulation and Cross-Shelf Transport of Coastal Waters by Submesoscale Cyclones in the Black Sea

Kubryakov,

Aleskerova,

Plotnikov

et al. 2023

Remote Sensing

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High- and medium-resolution satellite optical imagery show that submesoscale cyclonic eddies (SCEs) trap coastal waters and induce their rapid cross-shelf transport. Due to the presence of a rigid boundary, the convergence is observed in the coastal part of SCEs. It causes accumulation of suspended matter, which spins inward in a spiral motion toward the SCE core. Small SCEs with a radius of 1–10 km transport waters with local anomalies in the concentration of chlorophyll, total suspended matter and temperature to a distance of up to 150 km and are observed for more than 10 days. Lagrangian calculations based on realistic NEMO numerical model are used to estimate the fate of the coastal waters in such SCEs. The eddy entrains the largest number of particles during its separation from the coast when its vorticity reaches the maximum. Then, the SCE weakens, which is accompanied by the flattening of initially risen isopycnals and deepening of the trapped coastal waters. The described mechanism shows that coastal SCEs may cause intense short-period cross-shelf transport of the biological and chemical characteristics, and is another process affecting the functioning of the marine ecosystems.

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“…В дальнейшем с увеличением разрешающей способности модели МГИ [1, 6] проводилась интерполяция массива на более мелкую сетку. При таком подходе в узлах сетки, близких к берегу, не учитываются важные особенности прибрежных зон, что вносит здесь неточность в результаты моделирования [7]. Поэтому актуальной задачей представляется уточнение данных о глубинах моря для более точного описания гидрофизических полей.…”

Section: Introductionunclassified

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

Дымова¹,

Miklashevskaya²

2019

MGZh

View full text Add to dashboard Cite

Accuracy of the reconstructed hydrophysical fields calculated using different data on bottom topography is estimated in order to determine the depth array corresponding to the modern tasks of the Black Sea circulation modeling with high spatial resolution. Methods and Results. Two numerical experiments on modeling the circulation were carried out based on the Marine Hydrophysical Institute, Russian Academy of Sciences (MHI RAN) ocean model. Horizontal resolution was 1.6 km, 27 irregular z-horizons were preset vertically and the SKIRON/Eta data (2011) were used as the atmospheric forcing for both cases. Difference between the experiments consisted in application of different bathymetry. In the first experiment, the bottom topography was preset in accordance with the Black Sea depths from the MHI Ocean Data Bank with the 5-minute resolution; in the second onebased on the European Marine Observation and Data Network (EMODnet) depth array with the 1/8ꞌ resolution. The calculated hydrophysical fields were compared with the temperature and salinity measurements, and satellite images of the sea surface temperature. The analysis showed that application of the depths data of higher resolution permitted to improve accuracy of thermohydrodynamic characteristics of the Black Sea circulation in the 30-300 m layer. The integral values of the eddy kinetic energy and the mean current kinetic energy for two experiments were also considered for both of the experiments. The results of the comparative analysis demonstrate the fact that, at the bottom topography with higher resolution taken into account, in the simulated system the mechanisms of energy redistribution between currents and eddies changed during intensive storm impacts. Conclusions. The results of the present research permit to conclude that in the experiment with a smoother bottom relief, increase of kinetic energy both of the eddies and currents was due to barotropic instability. In case of more complex bathymetry, the eddy kinetic energy increased mainly owing to the processes associated with baroclinic instability.

show abstract

Modeling meso- and sub-mesoscale circulation along the eastern Crimean coast using numerical calculations

Cited by 6 publications

References 5 publications

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

Accumulation and Cross-Shelf Transport of Coastal Waters by Submesoscale Cyclones in the Black Sea

Accuracy Estimation of the Black Sea Circulation Modeling Results Obtained at Different Bottom Topography

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