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

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

doi:10.3390/rs10020239

Cited by 17 publications

(25 citation statements)

References 80 publications

(117 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The strong anticyclonic eddy that moved southwestward played an important role in the process of splitting the cyclonic eddy. Generally, a cyclonic (anticyclonic) eddy corresponds to a cold (warm) core in the SST signature due to upwelling (downwelling) of centric water (Kubryakov et al, 2018). Consequently, the splitting case based on the SLA maps can be validated through the corresponding SSTA maps derived from AVHRR data, as shown in Fig.…”

Section: Case Of An Eddy Splittingmentioning

confidence: 98%

“…Le presented an angular momentum eddy detection and tracking algorithm (AMEDA) for detecting and tracking eddies in the Mediterranean Sea; this procedure identified the merging and splitting events and provided a complete dynamical evolution of the detected eddies during their lifetime. Similarly, Laxenaire et al (2018) proposed an original assessment on Agulhas rings, whose novelty lies in the detection of eddy splitting and merging events, and they found these events are abundant and significantly impact the concept of a trajectory associated with a single eddy. Such studies simply considered an eddy at one moment as a single eddy entity, which was then split into two separate eddies at the next moment, without consideration of eddy-eddy interaction processes.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

et al. 2019

View full text Add to dashboard Cite

Abstract. This study investigated the statistics of eddy splitting and merging in the global oceans based on 23 years of altimetry data. Multicore structures were identified using an improved geometric closed-contour algorithm of sea surface height. Splitting and merging events were discerned from continuous time series maps of sea level anomalies. Multicore structures represent an intermediate stage in the process of eddy evolution, similar to the generation of multiple nuclei in a cell as a preparatory phase for cell division. Generally, splitting or merging events can substantially change (by a factor of 2 or more) the eddy scale, amplitude, and eddy kinetic energy. Specifically, merging (splitting) generally causes an increase (decrease) of eddy properties. Multicore eddies were found to tend to split into two eddies with different intensities. Similarly, eddy merging is not an interaction of two equal-intensity eddies, and it tends to manifest as a strong eddy merging with a weaker one. A hybrid tracking strategy based on the eddy overlap ratio, considering both multicore and single-core eddies, was used to confirm splitting and merging events globally. The census revealed that eddy splitting and merging do not always occur most frequently in eddy-rich regions; e.g., their frequencies of occurrence in the Antarctic Circumpolar Current and western boundary currents were found to be greater than in midlatitude regions (20–35∘) to the north and south. Eddy splitting and merging are caused primarily by an unstable configuration of multicore structures due to obvious current– or eddy–topography interaction, strong current variation, and eddy–mean flow interaction.

show abstract

Section: Case Of An Eddy Splittingmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Generally, a cyclonic (anticyclonic) eddy corresponds to a cold (warm) core in the SST signature due to upwelling (downwelling) of centric water (Kubryakov et al, 2018). Consequently, the splitting case based on the SLA maps can be validated through the corresponding SST anomaly (SSTA) maps derived from AVHRR data, as shown in Figure 4.…”

Section: Case Of An Eddy Splittingmentioning

confidence: 99%

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

Cui¹,

Wang²,

Zhang³

et al. 2018

Preprint

View full text Add to dashboard Cite

Abstract. This study investigated the statistics of eddy splitting and merging in the global oceans based on 23 years’ altimetry data. Multicore structures were identified using an improved threshold-free closed-contour algorithm of sea surface height. Splitting and merging events were discerned from continuous time series maps of sea level anomalies. Multicore structures represent an intermediate stage in the process of eddy evolution, similar to the generation of multiple nuclei in a cell as a preparatory phase for cell division. Generally, splitting or merging events can change substantially (by a factor of two or more) the eddy scale, amplitude, and eddy kinetic energy. Specifically, merging (splitting) generally causes an increase (decrease) of eddy properties. Multicore eddies were found to tend to split into two eddies with different intensities. Similarly, eddy merging is not an interaction of two equal-intensity eddies, and that it tends to manifest as a strong eddy merging with a weaker one. A hybrid tracking strategy based on the eddy overlap ratio, considering both multicore and single-core eddies, was used to confirm splitting and merging events globally. The census revealed that eddy splitting and merging do not always occur most frequently in eddy-rich regions, e.g., their frequencies of occurrence in the Antarctic Circumpolar Current and western boundary currents were found obviously higher than mid-latitude regions (20°–35°) north and south. Eddy splitting and merging are caused primarily by an unstable configuration of multicore structures due to obvious current– or eddy–topography interaction, strong current variation, and eddy–mean flow interaction.

show abstract

“…The field of current velocities is reconstructed as a result of cloudless image sequence processing of under the assumption that the image brightness is transferred by the currents. In this case, the transport-diffusion equation is usually used [11][12][13][14] in order to describe the transfer of contrasts in the radiation field.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the Black Sea Upper Layer Based on Satellite Data: Gridded Altimetry versus High Resolution IR Images

Mizyuk¹,

Korotaev²

2019

PhO

View full text Add to dashboard Cite

Marine Hydrophysical Institute of RAS, Sevastopol, Russian Federation * artem.mizyuk@mhi-ras.ruPurpose. During more than 20 years, very detailed notions of the sea level variability in the World Ocean and its particular parts have been obtained based on satellite altimetry observations. Their advantage consists in possibility of a fairly rapid assessment of the surface currents' velocities at meso scales. The alternative method for studying surface dynamics is motion estimation using a sequence of visible/infrared (IR) satellite images of the sea surface. The purpose of the present study is to compare the results obtaineds from application of two described methods used to analyze general circulation of the Black Sea surface layer. Methods and Results. The structure of the current fields in the northwestern Black Sea in winter, 1999 is investigated using the results of analysis of the IR image sequence from the NOAA/AVHRR sensors, as well as the gridded sea level anomaly (SLA) data (processing level L4) and the along-track measurements (level processing L3) from the Copernicus Marine Environment Monitoring Service. The surface currents' velocities are estimated based on the sea level field, which is calculated using two versions of mean dynamic topography. To compare the gridded altimetry and the results of the image sequence processing, a simple procedure is proposed for reconstructing the sea level using the current velocities' components.The results of reconstructing the surface circulation features by two methods were compared and demonstrated, in particular, the anticyclonic eddy locations in the northwestern part of the Black Sea. It is noted that the locations of the eddy center in the sea level fields reconstructed from the altimetry data and by processing of the IR image sequence are different. Evolution of the eddy is investigated using the SLA data. It is shown that its motion is rather intermittent in time that can be a result of applying the procedure of optimal interpolation. Conclusions. It is noted that the gridded satellite altimetry product from the CMEMS, being applied to the Black Sea basin, should be used with due regard for the provided information on the mapping errors.

show abstract

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

Cited by 17 publications

References 80 publications

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

Multicore structures and the splitting and merging of eddies in global oceans from satellite altimeter data

Dynamics of the Black Sea Upper Layer Based on Satellite Data: Gridded Altimetry versus High Resolution IR Images

Contact Info

Product

Resources

About