Suspended-Matter Distribution Near the Western Coast of Crimea under the Impact of Strong Winds of Various Directions

Aleskerova, A. A.; Kubryakov, A. A.; Goryachkin, Yu. N.; Stanichny, S. V.; Garmashov, Anton

doi:10.1134/s0001433819090044

Cited by 10 publications

(6 citation statements)

References 21 publications

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“…On 10 September 2004, strong northeast winds with a velocity of 8-12 m/s hit the west coast of Crimea. Wave-driven erosion of the clay cliffs causes a release of a high amount of suspended matter off west Crimea [45]. TSM in the coastal zone after this storm in several places reached 10 mg/L, and was higher than 1 mg/L.…”

Section: Case 2 September 2004mentioning

confidence: 96%

“…Highly turbid jet with a width of 10 km is seen near the western coast of Crimea. This jet was formed due to the action of the strong northeast winds, which cause upwelling and intense along-shore currents, transporting turbid coastal waters to the south [45]. Rapid change in the coastline orientation causes the separation of the jet from the coast, accompanied by its instability and the formation of SCEs [10,46].…”

Section: Convergence In the Coastal Part Of Submesoscale Cyclonesmentioning

confidence: 99%

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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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Section: Case 2 September 2004mentioning

confidence: 96%

Section: Convergence In the Coastal Part Of Submesoscale Cyclonesmentioning

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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“…The accompanying storm waves cause clay cliff abrasion resulting in a dramatic increasing of coastal water turbidity. These waters are entrained into a strong frontal current formed on the periphery of the upwelling and directed to the south [32].…”

Section: Datamentioning

confidence: 99%

Submesoscale Currents from UAV: An Experiment over Small-Scale Eddies in the Coastal Black Sea

et al. 2022

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A commercial unmanned aerial vehicle (UAV) is used for coastal submesoscale current estimation. The measurements were conducted in the Black Sea coastal area with a DJI Mavic quadcopter operated in self-stabilized mode at different look geometry (200–500-m altitude, 0–30∘ incidence angle). The results of four flights during 2020–2021 are reported. Some scenes captured a train of or individual eddies, generated by a current flowing around a topographic obstacle (pier). The eddies were optically visible due to the mixing of clear and turbid waters in the experiment area. Wave dispersion analysis (WDA), based on dispersion shell signature recognition, is used to estimate the sea surface current in the upper 0.5-m-thick layer. The WDA-derived current maps are consistent with visible eddy manifestations. The alternative method, based on 4D-variational assimilation (4DVAR), agrees well with WDA and can complement it in calm wind conditions when waves are too short to be resolved by the UAV sensor. The error of reconstructed velocity due to the uncontrolled UAV motions is assessed from referencing to static land control points. At a 500-m altitude and 7–10 m s−1 wind speed (reported by a local weather station for 10-m height), the UAV drift velocity, or the bias of the current velocity estimate, is about 0.1 m s−1, but can be reduced to 0.05 m s−1 if the first 10 s of the UAV self-stabilization period are excluded from the analysis. The observed anticyclonic eddies (200–400 m in diameter with 0.15–0.30 m s−1 orbital velocity) have an unexpectedly high Rossby number, Ro∼15, suggesting the importance of nonlinear centrifugal force for such eddies and their significant role in coastal vertical transport.

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“…Локальные узкие фронты в основном выходят из состояния геострофического баланса, влияющего на более крупные вихри, что приводит к развитию вторичной циркуляции в верхних слоях океана с очень большими локализованными вертикальными скоростями. Это, в свою очередь, стимулирует обмен между поверхностью и глубинными слоями [5] и может увеличивать концентрацию и перенос взвеси в этих областях конвергенции [6][7][8]. Таким образом, эти фронты являются «горячими точками» для биологических процессов [9] и дрейфующих загрязнений [10], включая микропластик и морские водоросли.…”

Section: фронтальная динамика верхнего слояunclassified

Studies of Sub-Mesoscale Variability of the Ocean Upper Layer Based on Satellite Observations Data

Chapron¹,

Kudryavtsev²,

Collard³

et al. 2020

MGZh

Self Cite

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The approach represented in the article is applied to analysis of satellite scanner optical images of high spatial resolution for identifying and quantitative determining the characteristics of the sub-mesoscale dynamic processes in the ocean upper layer. Methods and Results. The Envisat AATSR and MERIS SAR-images are used as the satellite data, which permit to determine the ocean surface temperature and surface brightness in the visible range, respectively. Variations in the sea surface glitter contrasts are associated with modulations of the sea surface roughness (rms slope of short waves) on the currents. It is shown that the surface roughness contrasts correlate with the spatial inhomogeneities of the ocean surface temperature, tracing submesoscale processes in the ocean (spiral eddies, filaments, local shears of currents). The described model of formation of surface manifestations is based on interaction between the Ekman current and the main flow vorticity. Conclusions. Possibility of detecting and quantitative assessing the intense current gradients in the vicinity of sub-mesoscale fronts is shown. These gradients are manifested in the optical satellite images through the ocean surface roughness modulations. The proposed approach makes it possible to study and to assess quantitatively the dynamic processes taking place in the vicinity of the submesoscale fronts. These processes, in their turn, affect the exchange of momentum, heat and gases between the ocean and the atmosphere. The prospects of applying the sub-mesoscale variability defined from the satellite measurements, to development of the models and the systems for the ocean global observations and monitoring are discussed.

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Suspended-Matter Distribution Near the Western Coast of Crimea under the Impact of Strong Winds of Various Directions

Cited by 10 publications

References 21 publications

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

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

Submesoscale Currents from UAV: An Experiment over Small-Scale Eddies in the Coastal Black Sea

Studies of Sub-Mesoscale Variability of the Ocean Upper Layer Based on Satellite Observations Data

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