Long-Term Variability of Thermohaline Characteristics of the Azov Sea Based on the Numerical Eddy-Resolving Model

Mizyuk, A. I.; Korotaev, G. K.; Grigoriev, A.; Puzina, O. S.; Лишаев, П. Н.

doi:10.22449/1573-160x-2019-5-438-450

Cited by 10 publications

(8 citation statements)

References 13 publications

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“…Regional configuration of NEMO model [25] with high spatial resolution, which provides a reconstruction of meso-and submesoscale variability of hydrophysical fields in the Black Sea basin [26], is applied in the work. The computational domain is a quasi-regular grid covering a cascade of basins of the Marmara, Black and Azov Seas with 1 / 96° step in latitude and 1 / 69° in longitude.…”

Section: Methodsmentioning

confidence: 99%

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Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part

Puzina¹,

Kubryakov²,

Mizyuk³

2021

PhO

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Purpose. The study is aimed at investigating seasonal variability and vertical distribution of the sub-mesoscale currents energy (scales L = 1 … 10 km, T = 1 … 10 days) in the deep and shelf zones of the Black Sea. Methods and Results. The study is based on the spectral analysis of the results obtained from the NEMO model numerical calculations performed with high spatial resolution 1 km. The analysis shows that the seasonal variability of the submesoscale energy is significantly different in deep and shelf zones of the basin. At the same time, in both regions, seasonal variation of energy of the sub-mesoscale currents with scales L < 10 rm (Esp) is in good agreement with that of the density fluctuations on the same scales. In the central part of the sea, the high values of Esp are concentrated in the upper mixed layer throughout the whole year. The Esp peak is observed in winter at the depths 0–40 m, which indicates the important role of baroclinic instability induced by the inhomogeneous distribution of the mixed layer depth (MLD) in the generation of sub-mesoscale processes. At the same time, in February in the central part of the northwestern shelf, an absolute minimum of (Esp) is observed. This minimum is caused by the complete mixing and barotropization of the water column. The Esp maximum values are observed in the shelf in September – October. This is related to the intensification of the brackish water transport from the river mouths by mesoscale eddies. In the autumn period high values of Esp in the shelf and deep part of the basin are observed in the deeper layer, compare to summer months .Variability of the Esp vertical distribution coincides to the time variation of MLD. Variability of the submesoscale energy is of a pulsating character with the short-term intensifications and weakenings. Such variability is significantly related to the passing of the mesoscale fronts and the cross-shelf water transport caused by the eddies and upwellings, which lead to the increase of the baroclinic instability. Conclusions. Analysis of the seasonal and vertical variability of the submesoscale currents in the Black Sea deep and shelf zones evidences about the decisive role of the baroclinic instability triggered mainly by the heterogeneity of MLD on their dynamics.

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Section: Methodsmentioning

confidence: 99%

“…For the Sea of Marmara, the initial conditions are taken from the global reanalysis of CMEMS service. A more detailed description of the experiment is presented in [26].…”

Section: Methodsmentioning

confidence: 99%

Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part

Puzina¹,

Kubryakov²,

Mizyuk³

2021

PhO

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“…В работе используется региональная конфигурация модельного комплекса NEMO [25] с высоким пространственным разрешением, позволяющая вос-производить мезо-и субмезомасштабную изменчивость гидрофизических полей в бассейне Черного моря [26]. Расчетный домен представляет собой квазирегулярную сетку, покрывающую каскад бассейнов Мраморного, Черного и Азовского морей с шагами 1 /96° по широте и 1 /69° по долготе.…”

Section: данные и методыunclassified

“…Для Мраморного моря начальные условия взяты из глобального реанализа службы CMEMS. Более подробное описание эксперимента представлено в работе [26].…”

Section: данные и методыunclassified

Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in its Central Part

Puzina¹,

Kubryakov²,

Mizyuk³

2021

MGZh

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Purpose. The study is aimed at investigating seasonal variability and vertical distribution of the submesoscale currents energy (scales L = 1 ... 10 km, T = 1 ... 10 days) in the deep and shelf zones of the Black Sea. Methods and Results. The study is based on the spectral analysis of the results obtained from the NEMO model numerical calculations performed with high spatial resolution 1 km. The analysis shows that in the areas under investigation, seasonal variability of the sub-mesoscale currents energy is significantly different. At that, in both regions, seasonal variation of energy of the sub-mesoscale currents whose scale is less than 10 km (Esp) is in good agreement with that of the density fluctuations on the same scales. In the central part of the sea, the high values of (Esp) are concentrated in the upper mixed layer throughout the whole year. The (Esp) peak is observed in winter at the depths 0–40 m, which indicates the important role of baroclinic instability (induced by the inhomogeneous distribution of the upper mixed layer during this period) in generation of sub-mesoscale processes in the Black Sea. At the same time, in February in the central part of the northwestern shelf, an absolute minimum of (Esp) is observed due to complete mixing and barotropization of the water column. The (Esp) maximum values are noted in September – October, that is related to intensification of the desalinated water cross-shelf transport from the river mouths being affected by the synoptic eddies. At the same time, in the autumn period in this region, the (Esp) high values are observed in the layer, the thickness of which is higher than that in summer (as well as in the central part of the sea). Dynamics of the (Esp) values distribution corresponds to the time variation of the upper mixed layer thickness. Variability of the sub-mesoscale currents energy is of a pulsating character with the short-term intensifications and weakenings. Such variability is significantly related to passing of the synoptic fronts and the cross-shelf water transport being influenced by the eddies and upwellings, which lead to baroclinic instability of waters. Conclusions. Seasonal and vertical variability of the spectral energy in the Black Sea deep and shelf zones testifies in favor of the decisive role of the water baroclinic instability arising due to heterogeneity of the upper mixed layer.

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“…Simulation of the Don waters propagation in the Azov Sea without taking into account external influences was carried out in [5]. It was established that the runoff currents constitute an alongshore cyclonic stream encircling the Azov Sea.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Process of Salt Water Inflow to the Don Mouth from the Taganrog Bay

Chikin¹,

Чикина²

2021

PhO

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Purpose. Numerical study based on the model example is aimed at examining the process of the salt water inflow to the Stary Don sleeve from the Taganrog Bay due to the wind water surge. Methods and Results. Complex mathematical model of the flow and salt distribution in the open riverbed is described. The section of the River Don, consisting of the Stary Don sleeve and a part of the main channel was considered. Salt is delivered through the host reservoir – the Taganrog Bay. The model is described by the system of Saint-Venant equations and the convection-diffusion equation. The problem is solved by the finite-difference methods. The results of the numerically studied influence of the sea surface level in the Taganrog Bay both on the flow nature in the Don Delta area and the degree of salt penetration upstream of the river are obtained. It was numerically established that the flow rate did not significantly affect salt concentration in the Don main channel. Conclusions. The computational experiments showed that the decisive factor in the process of the salt water inflow to the Don Delta from the Taganrog Bay consisted in the sea level significant increase resulting from extreme wind surges; and the preceding runoffs enhanced this effect even greater. The represented model gives an idea of the general trend in the process of the Don Delta possible salinization as a result of the surge phenomena.

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Long-Term Variability of Thermohaline Characteristics of the Azov Sea Based on the Numerical Eddy-Resolving Model

Cited by 10 publications

References 13 publications

Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part

Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in Its Central Part

Seasonal and Vertical Variability of Currents Energy in the Sub-Mesoscale Range on the Black Sea Shelf and in its Central Part

Numerical Study of the Process of Salt Water Inflow to the Don Mouth from the Taganrog Bay

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