Manifestation of Spiral Structures under the Action of Upper Ocean Currents

Shomina, Olga V.; Danilicheva, Olga A.; Tarasova, Tatiana V.; Kapustin, Ivan A.

doi:10.3390/rs14081871

Cited by 10 publications

(4 citation statements)

References 77 publications

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“…Optical images also show irregularities that can additionally be caused by algal blooms, redistribution of suspended matter, and other processes that affect water color (see, for example, [6]). The prospects for solving the inverse problem, namely, retrieval of the characteristics of sea currents from remote sensing data, are described in [7][8][9]. One promising approach is associated with coherent imaging of the sea surface [10]; however, the spatial resolution of the resulting data may be insufficient to observe smaller-scale current irregularities, such as those related to internal waves (IWs).…”

Section: Introductionmentioning

confidence: 99%

Manifestation of Internal Waves in the Structure of an Artificial Slick Band

Ermoshkin,

Shomina,

Molkov

et al. 2023

Remote Sensing

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The results of a field experiment devoted to observing slick-band shape variations occurring due to the action of heterogeneous currents related to the passage of internal waves are presented and analyzed on the basis of numerical simulation. The spatiotemporal structure of a train of five solitons of internal waves has been retrieved. Their evolution in the coastal area is demonstrated based on the analysis of propagation characteristics. It is shown that the first soliton, characterized by the higher values of amplitude and width, collapsed when entering shallow water near the observation platform. The parameters of an artificial slick band affected by the passage of internal waves are determined. It is shown that the direction and width of the slick band are related to the direction and magnitude of the upper-ocean horizontal current, which contains a component related to the internal wave. The results of numerical simulation are qualitatively and quantitatively consistent with experimental data at short distances from the platform. An analysis of the conditions responsible for different regimes of slick-band response to the upper-ocean currents generated by propagating internal waves has been performed.

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Section: Introductionmentioning

confidence: 99%

Manifestation of Internal Waves in the Structure of an Artificial Slick Band

Ermoshkin,

Shomina,

Molkov

et al. 2023

Remote Sensing

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“…The high spatiotemporal variability of submesoscale/mesoscale gyres/eddies in seas and oceans makes satellite imagery an appropriate tool for observing the size and distribution of such coherent circulations [6,[14][15][16]. In particular, Synthetic Aperture Radar (SAR) imagery is often used to detect mesoscale/submesoscale circulation patterns (e.g., [17][18][19][20][21]).…”

Section: Introductionmentioning

confidence: 99%

Monitoring Mesoscale to Submesoscale Processes in Large Lakes with Sentinel-1 SAR Imagery: The Case of Lake Geneva

et al. 2022

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As in oceans, large-scale coherent circulations such as gyres and eddies are ubiquitous features in large lakes that are subject to the Coriolis force. They play a crucial role in the horizontal and vertical distribution of biological, chemical and physical parameters that can affect water quality. In order to make coherent circulation patterns evident, representative field measurements of near-surface currents have to be taken. This, unfortunately, is difficult due to the high spatial and temporal variability of gyres/eddies. As a result, few complete field observations of coherent circulation in oceans/lakes have been reported. With the advent of high-resolution satellite imagery, the potential to unravel and improve the understanding of mesoscale and submesoscale processes has substantially increased. Features in the satellite images, however, must be verified by field measurements and numerical simulations. In the present study, Sentinel-1 SAR satellite imagery was used to detect gyres/eddies in a large lake (Lake Geneva). Comparing SAR images with realistic high-resolution numerical model results and in situ observations allowed for identification of distinct signatures of mesoscale gyres, which can be revealed through submesoscale current patterns. Under low wind conditions, cyclonic gyres manifest themselves in SAR images either through biogenic slicks that are entrained in submesoscale and mesoscale currents, or by pelagic upwelling that appears as smooth, dark elliptical areas in their centers. This unique combination of simultaneous SAR imagery, three-dimensional numerical simulations and field observations confirmed that SAR imagery can provide valuable insights into the spatial scales of thus far unresolved mesoscale and submesoscale processes in a lake. Understanding these processes is required for developing effective lake management concepts.

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“…In recent years, phytoplankton distribution monitoring by various techniques (satellite image processing [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ], radar probing [ 11 ], laser remote sensing [ 12 , 13 , 14 , 15 , 16 , 17 ] and contact measurements with sample analysis [ 18 , 19 , 20 , 21 ]) has revealed an increased contamination of freshwater [ 22 , 23 ] and seawater areas [ 24 ] by blue–green algae. Phytoplankton blooms deplete dissolved oxygen, thus suppressing biodiversity in shallow waters and also poisoning them with biotoxins.…”

Section: Introductionmentioning

confidence: 99%

Laser Remote Sensing of Lake Kinneret by Compact Fluorescence LiDAR

Першин

Katsnelson

Grishin

et al. 2022

Sensors

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Harmful algal blooms in freshwater reservoirs became a steady phenomenon in recent decades, so instruments for monitoring water quality in real time are of high importance. Modern satellite remote sensing is a powerful technique for mapping large areas but cannot provide depth-resolved data on algal concentrations. As an alternative to satellite techniques, laser remote sensing is a perspective technique for depth-resolved studies of fresh or seawater. Recent progress in lasers and electronics makes it possible to construct compact and lightweight LiDARs (Light Detection and Ranging) that can be installed on small boats or drones. LiDAR sensing is an established technique; however, it is more common in studies of seas rather than freshwater reservoirs. In this study, we present an experimental verification of a compact LiDAR as an instrument for the shipborne depth profiling of chlorophyll concentration across the freshwater Lake Kinneret (Israel). Chlorophyll depth profiles of 3 m with a 1.5 m resolution were measured in situ, under sunlight conditions. A good correlation (R2 = 0.89) has been established between LiDAR signals and commercial algae profiler data. A non-monotonic algae depth distribution was observed along the boat route during daytime (Tiberias city–Jordan River mouth–Tiberias city). The impact of high algal concentration on water temperature laser remote sensing has been studied in detail to estimate the LiDAR capability of in situ simultaneous measurements of temperature and chlorophyll concentration.

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Manifestation of Spiral Structures under the Action of Upper Ocean Currents

Cited by 10 publications

References 77 publications

Manifestation of Internal Waves in the Structure of an Artificial Slick Band

Manifestation of Internal Waves in the Structure of an Artificial Slick Band

Monitoring Mesoscale to Submesoscale Processes in Large Lakes with Sentinel-1 SAR Imagery: The Case of Lake Geneva

Laser Remote Sensing of Lake Kinneret by Compact Fluorescence LiDAR

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