Dynamics of Batumi Anticyclone from the Satellite Measurements

Kubryakov, A. A.; Stanichny, S.V.

doi:10.22449/1573-160x-2015-2-59-68

Cited by 9 publications

(9 citation statements)

References 9 publications

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“…The lifetime of this anticyclonic formation is more than six months, the speed of movement is about 2 cm/s. The results obtained are consistent with the data of satellite observations of the Batumi anticyclone dynamics given in [17].…”

Section: Results Of the S1 And S2 Numerical Experimentssupporting

confidence: 91%

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2018

PhO

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The present paper represents the results of two experiments on numerical modeling (within the framework of the two-layer eddy-resolving model) of the Black Sea large-scale circulation under the influence of the seasonally-variable wind. The actual bottom topography is taken into account in the model. The motion is excited only by the tangential wind stress with a non-zero vorticity. The energy loss is due to the bottom friction, the friction at the layers' interface and the horizontal turbulent viscosity. In one of the experiments under consideration, the wind stress vorticity changes its sign depending on the season (in winter it is cyclonic, in summer-anticyclonic), but remains constant in space. In the other experiment, the field of the tangential wind stress is preset (according to the modern notions on its spatial variability) in such a way that over the sea western half there is the zone of anticyclonic vorticity, the area and intensity of which vary throughout the year. In both cases, the circulation in the Black Sea is periodically divided into two large cyclones-the "Knipovich glasses". However, due to the western intensification of currents caused by the β-effect, the wind stress with spatially uniform vorticity results in formation of a cyclonic cycle of extremely high intensity in the southwestern part of the basin. In the other experiment that takes into account spatial variability of the wind stress vorticity above the sea, namely, anticyclonic vorticity of the wind tangential stress over the basin western part, the obtained circulation quite corresponds to the observational data.

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Section: Results Of the S1 And S2 Numerical Experimentssupporting

confidence: 91%

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2018

PhO

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“…According to the assimilation results of altimetric measurements in the Black Sea circulation model [83], the anticyclonic eddy here is formed mainly in March and exists until the end of October -beginning of November. However, as the analysis of IR-images and visible spectral ranges shows, various eddies (one or several) are observed here in all seasons [84]. The Batumi anticyclone is not stationary.…”

Section: Long-living Eddies and Their Impact On Temporal Dynamics mentioning

confidence: 56%

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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“…Interestingly, it is situated in the so-called Batumi anticyclone zone. Recent studies based on satellite altimetry [23,76] have shown that in contrast to the summer situation, when powerful anticyclones are often observed here, in winter strong cyclones are formed in this zone. Some more mesoscale features are observed on the SST map: anticyclonic movement in the northeast (A1) and south (A2) of the map and a cyclonic eddy in the southwest (C2) (Figure 4a,b).…”

Section: Scene 4: System Of Eddies In the Southeastern Black Seamentioning

confidence: 64%

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

2018

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Two remote sensing methods, satellite altimetry and 4D-Var assimilation of satellite imagery, are used to compute surface velocity fields in the Black Sea region. Surface currents derived from the two methods are compared for several cases with intense mesoscale and large-scale dynamics during low wind conditions. Comparison shows that the obtained results coincide well quantitatively and qualitatively. However, satellite imagery provides more reasonable results on the spatial variability of coastal dynamics than altimetry data. In particular, this is related to the reconstruction of eddy coastal dynamics, such as Black Sea near-shore anticyclones. Current streamlines in these eddies are not closed near the coast in altimetry data, which we relate to the extrapolation during mapping procedure in the absence of coastal along-track measurements. On the other hand, in offshore areas, imagery-derived currents can be underestimated due to the absence of thermal contrasts and smoothing during the procedure of the 4D-Var assimilation. Wind drift currents are another source of inconsistency, as their impact is directly observed in satellite imagery but absent in altimetry data. The advantage of the 4D-Var method for reconstructing coastal dynamics is used to compute surface currents in the Marmara Sea on the base of 250 m resolution Modis optical data. The results reveal the very complex dynamics of the basin, with a large number of mesoscale and sub-mesoscale eddies. 4D-Var assimilation of Modis imagery is used to obtain information about dynamic characteristics of these small eddies with radiuses of 4-10 km.

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Dynamics of Batumi Anticyclone from the Satellite Measurements

Cited by 9 publications

References 9 publications

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Effect of Mesoscale Eddy Dynamics on Bioproductivity of the Marine Ecosystems

Reconstructing Large- and Mesoscale Dynamics in the Black Sea Region from Satellite Imagery and Altimetry Data—A Comparison of Two Methods

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