Physical mechanisms of submesoscale eddies generation: evidences from laboratory modeling and satellite data in the Black Sea

Зацепин, А. Г.; Kubryakov, A. A.; Aleskerova, A. A.; Elkin, Dmitry; Kukleva, O. N.

doi:10.1007/s10236-018-1239-4

Cited by 42 publications

(33 citation statements)

References 71 publications

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“…В работе [15] на основе контактных измерений показано, что скорости в субмезомаштабных вихрях радиусом 3-5 км могут достигать значений 0,25-0,5 м/с, что свидетельствует о высоких числах Россби в этих образованиях. Описание механизмов генерации субмезомасштабных вихрей и их анализ при помощи спутниковых данных и лабораторного моделирования в Черном море приведены в работе [16]. Авторы этой работы демонстрируют, что важным механизмом образования вихрей является баротропная неустойчивость течения, вызванная сдвигом скорости на фронтах синоптических антициклонов при взаимодействии с топографическими особенностями, интенсивном воздействии ветра.…”

Section: Seasonal and Vertical Variability Of Currents Energy 1 введениеunclassified

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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Section: Seasonal and Vertical Variability Of Currents Energy 1 введениеunclassified

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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“…The latter is frequently reported in literature (e.g. Zatsepin et al, 2019) and is attributed to horizontal shear instability of anticyclonic flows very effective to produce submesoscale cyclones (McWilliams, 2016). Analysis of the reconstructed current velocity and the filament length scale clearly shows submesoscale nature of these features with vertical vorticity being about three times the Coriolis frequency.…”

mentioning

confidence: 72%

Brief Communication: Mesoscale and submesoscale dynamics of marginal ice zone from sequential SAR observations

Kozlov

Plotnikov

Manucharyan

2020

Preprint

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“…In fact, the periphery of the anticyclone is a frontal zone characterized by pinching out of isopycnals to the sea surface and the presence of an intense shear current, where submesoscale cyclonic eddies are formed. In such structures the vertical velocity directed to the surface reaches very high values [7,64]. Sometimes this leads to an annular distribution of Chl on the eddy surface.…”

Section: Anticyclonic and Lens-like Eddiesmentioning

confidence: 99%

“…In the shelf and slope zones, sub-mesoscale processes are of great importance. Their dynamics is determined by strong vorticity and high deformation rates that occur on a scale of 0.1-10.0 km [5][6][7]. They can generate vertical velocities up to 100 m⋅day −1 and play a decisive role in the transport of biogenic elements to the photic zone.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mesoscale Eddy Dynamics on Bioproductivity of the Marine Ecosystems

Mikaelyan¹,

Zatsepin²,

Kubryakov³

2020

PhO

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Different types of mesoscale eddy dynamics are considered in the paper from the viewpoint of their effect on the plankton (mainly phytoplankton) amount and its taxonomic structure. The eddy structures of all types, including cyclonic, anticyclonic, water-body anticyclonic and frontal ones, as well as the dipole structures, actively affect plankton. Theoretical schemes of the influencing mechanisms, which are illustrated by the examples of such an impact on the plankton in the Black Sea, are examined. The analyzed responses of the marine plankton ecosystems to the eddy dynamics and the scientific literature review unambiguously testify the important role of these processes in formation of biological productivity in the seas and oceans. A cyclonic eddy forms the isopycnals rise (a dome-like bend) in its core both in the thermocline and in the pycno-halocline that elevates nitrocline; it promotes bioproductivity increase. In the center of the anticyclonic eddy, the thermocline and pycno-halocline deepen (deflection) which negatively affects bioproductivity. At the same time, the rise of the isopycnals occurs at the eddy periphery that, on the contrary, contributes to increase in primary production. In contrast to a regular anticyclone, a water-body (or lens-like) eddy induces the water rise in a layer above the depth of the maximum orbital velocity of the eddy, in other words, in its upper part it often acts like a cyclone. Thus, in any eddy there are the areas where the thermocline rises to the surface and, therefore, the prerequisites for the bioproductivity increase are formed. Strong winds not only enhance the effect of the eddies on biota, but can completely change the nature of this impact. When exposed to wind, the intensity of the biogenic elements transport to the photic layer in the cyclones can decrease, whereas in the lens-like anticyclones it can increase. The important point is that the long-living eddies change the influencing mechanisms depending on the stage of their evolution. At last, the eddy structures often promote changing in the dominant phytoplankton species that can significantly alter the flow of organic matter to the bottom and affect the global carbon cycle.

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Physical mechanisms of submesoscale eddies generation: evidences from laboratory modeling and satellite data in the Black Sea

Cited by 42 publications

References 71 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

Brief Communication: Mesoscale and submesoscale dynamics of marginal ice zone from sequential SAR observations

Effect of Mesoscale Eddy Dynamics on Bioproductivity of the Marine Ecosystems

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