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Relevant bibliographies by topics / Meso and submesoscale

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Dissertations / Theses
Book chapters
Conference papers

Academic literature on the topic 'Meso and submesoscale'

Author: Grafiati

Published: 25 May 2024

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Journal articles on the topic "Meso and submesoscale"

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Yu, Xiaolong, Alberto C. Naveira Garabato, Adrian P. Martin, Christian E. Buckingham, Liam Brannigan, and Zhan Su. "An Annual Cycle of Submesoscale Vertical Flow and Restratification in the Upper Ocean." Journal of Physical Oceanography 49, no. 6 (June 2019): 1439–61. http://dx.doi.org/10.1175/jpo-d-18-0253.1.

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AbstractNumerical simulations suggest that submesoscale turbulence may transform lateral buoyancy gradients into vertical stratification and thus restratify the upper ocean via vertical flow. However, the observational evidence for this restratifying process has been lacking due to the difficulty in measuring such ephemeral phenomena, particularly over periods of months to years. This study presents an annual cycle of the vertical velocity and associated restratification estimated from two nested clusters of meso- and submesoscale-resolving moorings, deployed in a typical midocean area of the northeast Atlantic. Vertical velocities inferred using the nondiffusive density equation are substantially stronger at submesoscales (horizontal scales of 1–10 km) than at mesoscales (horizontal scales of 10–100 km), with respective root-mean-square values of 38.0 ± 6.9 and 22.5 ± 3.3 m day−1. The largest submesoscale vertical velocities and rates of restratification occur in events of a few days’ duration in winter and spring, and extend down to at least 200 m below the mixed layer base. These events commonly coincide with the enhancement of submesoscale lateral buoyancy gradients, which is itself associated with persistent mesoscale frontogenesis. This suggests that mesoscale frontogenesis is a regular precursor of the submesoscale turbulence that restratifies the upper ocean. The upper-ocean restratification induced by submesoscale motions integrated over the annual cycle is comparable in magnitude to the net destratification driven by local atmospheric cooling, indicating that submesoscale flows play a significant role in determining the climatological upper-ocean stratification in the study area.

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Steffen, Elizabeth L., and Eric A. D'Asaro. "Meso- and Submesoscale Structure of a Convecting Field." Journal of Physical Oceanography 34, no. 1 (January 2004): 44–60. http://dx.doi.org/10.1175/1520-0485(2004)034<0044:massoa>2.0.co;2.

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Karimova, S. "OBSERVING SURFACE CIRCULATION OF THE WESTERN MEDITERRANEAN BASIN WITH SATELLITE IMAGERY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W2 (November 16, 2017): 97–104. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w2-97-2017.

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In this article, the benefits of using satellite imagery of different types (namely thermal infrared, visible-range, and synthetic aperture radar (SAR) images) for observing surface circulation of marine basins are being discussed. As a region of interest, we use the Western Mediterranean Basin. At first, the areas with sharpest thermal and chlorophyll-a gradients within the region of interest were defined on a seasonal base using the data provided by Aqua Moderate Resolution Imaging Spectrometer (MODIS). After that, mesoscale eddies were detected using different sea surface temperature (SST) products and, finally, submesoscale vortices were observed with Envisat Advanced SAR imagery. Thus found locations of eddies were compared with locations of the sharpest fronts discovered in the first part of the study, which showed that the biggest, mostly anticyclonic, eddies tended to correspond to locations of main surface currents; smaller cyclonic eddies were mostly attributed to thermal fronts, while submesoscale eddies were distributed quite homogeneous. The observations performed in that way revealed quite prominent basin-, meso- and submesoscale eddy activity in the region of interest. Additionally, significant seasonal variability in the type of surface water stirring was noted. Thus, the maximum of both meso- and submesoscale eddy activity seems to happen during the warm season, while during winter, presumably due to low Richardson numbers typical for the upper water layer, the turbulent features are still undeveloped and of the smaller spatial scale than during the warm period of year.

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Lin, Hongyang, Zhiyu Liu, Jianyu Hu, Dimitris Menemenlis, and Yongxiang Huang. "Characterizing meso- to submesoscale features in the South China Sea." Progress in Oceanography 188 (October 2020): 102420. http://dx.doi.org/10.1016/j.pocean.2020.102420.

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C. Pérez, Juan G., and Paulo H. R. Calil. "Regional turbulence patterns driven by meso- and submesoscale processes in the Caribbean Sea." Ocean Dynamics 67, no. 9 (July 21, 2017): 1217–30. http://dx.doi.org/10.1007/s10236-017-1079-7.

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Thomalla, Sandy J., Marie-Fanny Racault, Sebastiaan Swart, and Pedro M. S. Monteiro. "High-resolution view of the spring bloom initiation and net community production in the Subantarctic Southern Ocean using glider data." ICES Journal of Marine Science 72, no. 6 (June 8, 2015): 1999–2020. http://dx.doi.org/10.1093/icesjms/fsv105.

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Abstract In the Southern Ocean, there is increasing evidence that seasonal to subseasonal temporal scales, and meso- to submesoscales play an important role in understanding the sensitivity of ocean primary productivity to climate change. This drives the need for a high-resolution approach to resolving biogeochemical processes. In this study, 5.5 months of continuous, high-resolution (3 h, 2 km horizontal resolution) glider data from spring to summer in the Atlantic Subantarctic Zone is used to investigate: (i) the mechanisms that drive bloom initiation and high growth rates in the region and (ii) the seasonal evolution of water column production and respiration. Bloom initiation dates were analysed in the context of upper ocean boundary layer physics highlighting sensitivities of different bloom detection methods to different environmental processes. Model results show that in early spring (September to mid-November) increased rates of net community production (NCP) are strongly affected by meso- to submesoscale features. In late spring/early summer (late-November to mid-December) seasonal shoaling of the mixed layer drives a more spatially homogenous bloom with maximum rates of NCP and chlorophyll biomass. A comparison of biomass accumulation rates with a study in the North Atlantic highlights the sensitivity of phytoplankton growth to fine-scale dynamics and emphasizes the need to sample the ocean at high resolution to accurately resolve phytoplankton phenology and improve our ability to estimate the sensitivity of the biological carbon pump to climate change.

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Дымова, Ольга Алексеевна, and Olga Dymova. "Modeling of the meso- and submesoscale dynamic processes in the Black sea coastal zones." Proceedings of the Karelian Research Centre of the Russian Academy of Sciences, no. 8 (August 30, 2017): 21. http://dx.doi.org/10.17076/mat585.

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Flexas, Mar M., Martina I. Troesch, Steve Chien, Andrew F. Thompson, Selina Chu, Andrew Branch, John D. Farrara, and Yi Chao. "Autonomous Sampling of Ocean Submesoscale Fronts with Ocean Gliders and Numerical Model Forecasting." Journal of Atmospheric and Oceanic Technology 35, no. 3 (March 2018): 503–21. http://dx.doi.org/10.1175/jtech-d-17-0037.1.

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ABSTRACTSubmesoscale fronts arising from mesoscale stirring are ubiquitous in the ocean and have a strong impact on upper-ocean dynamics. This work presents a method for optimizing the sampling of ocean fronts with autonomous vehicles at meso- and submesoscales, based on a combination of numerical forecast and autonomous planning. This method uses a 48-h forecast from a real-time high-resolution data-assimilative primitive equation ocean model, feature detection techniques, and a planner that controls the observing platform. The method is tested in Monterey Bay, off the coast of California, during a 9-day experiment focused on sampling subsurface thermohaline-compensated structures using a Seaglider as the ocean observing platform. Based on model estimations, the sampling “gain,” defined as the magnitude of isopycnal tracer variability sampled, is 50% larger in the feature-chasing case with respect to a non-feature-tracking scenario. The ability of the model to reproduce, in space and time, thermohaline submesoscale features is evaluated by quantitatively comparing the model and glider results. The model reproduces the vertical (~50–200 m thick) and lateral (~5–20 km) scales of subsurface subducting fronts and near-bottom features observed in the glider data. The differences between model and glider data are, in part, attributed to the selected glider optimal interpolation parameters and to uncertainties in the forecasting of the location of the structures. This method can be exported to any place in the ocean where high-resolution data-assimilative model output is available, and it allows for the incorporation of multiple observing platforms.

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Ivanov, L. M., C. A. Collins, P. Marchesiello, and T. M. Margolina. "On model validation for meso/submesoscale currents: Metrics and application to ROMS off Central California." Ocean Modelling 28, no. 4 (January 2009): 209–25. http://dx.doi.org/10.1016/j.ocemod.2009.02.003.

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Gil, Julio. "Macro and mesoscale physical patterns in the Bay of Biscay." Journal of the Marine Biological Association of the United Kingdom 88, no. 2 (March 2008): 217–25. http://dx.doi.org/10.1017/s0025315408000490.

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The study area for this work includes all the southern edge of the Bay of Biscay, from the north-west Iberian Peninsula to the southern half of the French shelf. The principal aim of this article is to provide a complete overview of the physical oceanography of the area, mainly in its mesoscale aspects, of which there are few published studies, and the implications for early fish life history stages. The results showed the existence of two space and temporal scales for most of the physical processes that occur in the Bay of Biscay, a macroscale for seasonal time periods and a meso and submesoscale for the periods between seasons. The importance of local phenomena, such as upwelling or the variability of the Poleward Current, was observed. The interaction of both scales on these physical processes is discussed and the need for sampling at the submesoscale level to determine the distribution of ichthyoplankton is considered. Moreover, the mesoscale physical oceanography study is essential to improve the knowledge of interactions between strategies and environmental conditions that result in a significant mortality reduction in fish early stages.

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Dissertations / Theses on the topic "Meso and submesoscale"

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Thomsen, Sören [Verfasser]. "Meso- and submesoscale variability within the Peruvian upwelling regime : mechanisms of oxygen supply to the subsurface ocean. / Sören Thomsen." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/109622089X/34.

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Tchilibou, Michel Lionel. "Dynamique méso-sousmésoéchelle et marée interne dans le Pacifique tropical : implications pour l'altimétrie et la mer des Salomon." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30292/document.

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Ce travail de thèse est une contribution à la description des signaux océaniques de fines échelles dans les tropiques, fines échelles objet de la futur mission altimétrique SWOT. Ces fines échelles spatiales concernent à la fois des phénomènes dits de méso et sous mésoéchelle, produits par la dynamique océanique (tourbillons, filaments) mais aussi des ondes internes (dont la marée barocline ou marée interne). Les fines échelles sont une source importante de mélange pour l'océan. La méso et sous mésoéchelle océanique traduisent une dynamique turbulente associée à des cascades d'énergie donnant lieu à des pentes spectrales sur des spectres en nombre d'onde de niveau de la mer ou d'énergie cinétique tourbillonnaire. Les pentes spectrales des spectres du niveau de la mer altimétrique sont calculées dans la bande 250-70 km, ces pentes sont très plates dans les tropiques. Par conséquence, elles sont en désaccord aussi bien avec les théories de la turbulence qu'avec les pentes des spectres du niveau de la mer des modèles numériques. Cette thèse vise à élucider ces désaccords dans le Pacifique tropical (20°S-20°N), en quantifiant les niveaux d'énergie et les longueurs d'onde relatives à la dynamique méso-échelle et aux ondes internes. L'importance de la marée interne dans les tropiques est illustrée dans le contexte régional de la mer des Salomon, où cette marée contribue à un fort mélange dans une zone de connexion entre la région subtropicale et la région équatoriale. La première partie de la thèse est une analyse spectrale 3D (fréquence, longueurs d'ondes zonales et méridiennes) de la dynamique tropicale à partir d'un modèle au 1/12°. La région équatoriale (10°N-10°S) se caractérise par une dynamique grande échelle zonale associée aux ondes équatoriales et une dynamique fine échelle (< 600 km) marquée par des mouvements préférentiellement méridiens en lien avec les ondes tropicales d'instabilité. Dans les régions non équatoriales (entre 10° et 20° de latitude) la fine échelle est davantage isotropique, concentrée dans la bande 300-70 km, et connectée à la grande échelle zonale par un continuum d'énergie traduisant l'importance de la cascade inverse. Les pentes des spectres en nombre d'onde de niveau de la mer relatives à la méso/sous-méso échelle des différentes régions sont curieusement proches des pentes théoriques typiques des moyennes latitudes,mais restent en désaccord avec celles issues des observations altimétriques. [...]
This thesis work contributes to our understanding of the fine scale oceanic signals in the tropics, that are the focus of attention for the future altimeter mission SWOT. These fine scales concern meso and submesoscale due to ocean dynamics (eddies, filaments) and internal waves such as the barocline or internal tide. Fines scales are important source of ocean mixing. Meso and submesoscale reflect turbulent dynamic associated with energy cascades giving rise to sea surface height or eddie kinetic wavenumber spectrum slope. The observed altimetric sea surface height spectral slope evaluated in the band 250-70 km are very flat in the tropics. They disagree with turbulence theories and with sea surface height spectral slope of the numerical model. This thesis aims to remove the ambiguity of this spectra flattening in the tropical Pacific (20°S-20°N) by quantifying energy levels and wavelengths related to mesoscale dynamics and internal waves. The importance of the internal tide in the tropics is then illustrated in a regional context in the Solomon Sea, where water mass mixing plays an important role in the connections between the subtropical region and the equatorial region. The first part of the thesis is based on a 3D spectral analysis (frequency, zonal and meridional wavelengths) of tropical dynamics from a 1/12° model. The equatorial region (10°N-10°S) is characterized by large zonal dynamics associated with equatorial waves and finer scale dynamics ( < 600 km) marked by preferentially meridional movements associated with tropical instabilities waves. In the non-equatorial regions (10°-20°NS) the finer scales are more isotropic and concentrated in the band 300-70 km, and are connected to the large zonal scales by an energy continuum reflecting the importance of the indirect cascade. The slopes of the modelled sea surface height wavenumber spectra over the meso/submesoscale band in the different tropical regions are curiously close to the QG/SQG theoretical spectra typical of mid latitudes, but the slopes disagree with those from altimetry observations. Including the high frequency internal waves in a 1/36° model forced by the barotropic tide shows that coherent (predictable) internal tide is the main contributor causing the flattening of the spectra in the tropics, and particularly the M2 first baroclinic mode. However, the contribution of the incoherent (non-predictable) tide dominates at scales below 70 km and still affects scales up to 200 km. [...]

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Capuano, Tonia Astrid. "Small-scale ocean dynamics in the Cape Basin and its impact on the regional circulation." Thesis, Brest, 2017. http://www.theses.fr/2017BRES0115/document.

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Nous étudions le rôle des processus océaniques à petite échelle dans la formation et transformation des eaux de surface et intermédiaires qui participent à l’échange Indo- Atlantique à travers le Bassin du Cap. La dynamique de cette région est caractérisée par une forte turbulence et nous montrons l’impact que les structures de méso- ou de sous-méso- échelle, leurs interactions dynamiques et leur variabilité saisonnière ont sur les eaux locales de la thermocline. Une série des simulations numériques, allant de ’eddypermitting’ à ’submesoscale resolving’, souligne l’importance d’une résolution verticale adéquate pour bien représenter les propriétés des masses d’eau.Les tourbillons de Aiguilles sont principalement générés par des instabilités baroclines, et sont caractérisés par une saisonnalité, liée aux différentes instabilités dans les couches supérieures. En été, les instabilités symétriques sont plutôt en jeu, tandis qu’en hiver les instabilités de la couche de mélange prédominent.L’instabilité barocline de Charney connecte ces deux régimes de la sous-méso-échelle et joue un rôle majeur dans la formation saisonnière d’un nouveau type d’eaux modales : l’Agulhas Rings Mode Water.Enfin, on montre que tant les cyclones que les anticyclones transportent et mélangent l’Antarctic IntermediateWater, l’étirement de la méso-échelle produisant des filaments et structures thermohalines très fines.Nos résultats suggèrent l’existence des deux régimes dynamiques qui affectent les couches supérieures et intermédiaires du Bassin du Cap. Près de la surface, la frontogenèse et une énergique sous-méso-échelle conduisent à un régime agéostrophique. Les profondeurs intermédiaires sont caractérisées par un régime quasi-géostrophique due à l’action prédominante de la méso-échelle
This study addresses the role of oceanic small-scale processes in the formation and transformation of subsurface waters that participate in the Indo-Atlantic interocean exchange.We focus on the Cape Basin dynamics, characterized by a highly non-linear turbulence.We provide qualitative and quantitative evidence of the direct impact that meso- and submesoscale structures, their dynamical interactions and their seasonal variability have on the local thermocline and intermediate waters. A sequence of numerical simulations, ranging from ’eddy-permitting’ to ’submesoscale resolving’, underlines the importance of an adequate vertical resolution to correctly depict the water masses properties.We point out that Agulhas eddies are mainly generated through baroclinic instabilities and are marked by a clear seasonality. This is linked to the seasonal occurrence of distinct meso-submesoscale instabilities in the upper layers: symmetric instabilities are at play during summer, while mixed-layer instabilities prevail in winter.We also found that Charney baroclinic instability connects these two submesoscale regimes and plays a major role in the seasonal formation of a newly-identified type of mode waters: Agulhas Rings Mode Water. Finally, we show that eddies of both polarity advect, stir and mix Antarctic Intermediate Water, via the mesoscale strain field producing filaments and T-S fine-scale structures.Our results suggest the existence of two dynamical regimes affecting the upper and intermediate layers of the Cape Basin. Near the surface, the submesoscale-driven frontogenesis and their enhanced energetics lead to a predominance of ageostrophic dynamics. The intermediate depths are, instead, characterised by a quasigesotrophic regime due to the prevailing mesoscale effects

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Mallil, Katia. "Circulation générale et processus de sous-méso échelle dans le bassin Algéro-Provençal de la Méditerranée à partir de données in situ." Electronic Thesis or Diss., Sorbonne université, 2023. http://www.theses.fr/2023SORUS113.

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Les données de la campagne océanographique SOMBA-GE2014, nous ont permis de mettre en évidence la présence des gyres algériens via des mesures de courant. Les radiales de température et salinité obtenues à travers le bassin ont permis la visualisation de l'influence des gyres algériens sur la répartition hydrologique. En effet des eaux levantines intermédiaires jeunes s'étendent depuis la veine d'eau remontant le plateau sarde vers l'intérieur du bassin algérien, sous forme de patchs. Des climatologies du cœur de la LIW et de WIW couvrant la période 1960 à 2017 dans le bassin Algéro-Provençal, ont été produites grâce à la base de données Méditerranéenne de profils de température et salinité et des nouvelles méthodes de détection. Un transport de LIW vers l'ouest, depuis la veine sud de la Sardaigne vers l'intérieur du bassin algérien en suivant la périphérie des gyres algériens est mis en évidence par cette climatologie et confirmé par la corrélation croisée du signal de refroidissement observé durant les années 80. L'estimation des tendances des caractéristiques de la LIW et WIW contribuent à documenter leur évolution. L'accélération du réchauffement observée dans tout le bassin à partir de 2010 est alarmante. Les observations par les gliders ont permis d'appuyer nos conclusions quant à l'efficacité des structures de méso et de sous-méso échelle pour le transport des masses d'eaux vers l'intérieur du bassin Algérien. En effet nous avons observé des parcelles de WIW, LIW et WMDW à l'intérieur du bassin Algérien dont les caractéristiques sont plus marquées que les eaux adjacentes
Data from the SOMBA-GE2014 oceanographic cruise, allowed us to highlight the presence of Algerian gyres via current measurements. The temperature and salinity sections obtained across the basin allowed the visualization of the influence of the Algerian gyres on the hydrological distribution. Indeed, young intermediate Levantine waters extend from Saridinian LIW vein towards the interior of the Algerian basin, in the form of patches. LIW and WIW core climatologies covering the period 1960 to 2017 in the Algerian-Provençal basin were produced using the Mediterranean database of temperature and salinity profiles and new detection methods. A westward transport of LIW from the southern vein of Sardinia to the interior of the Algerian basin following the periphery of the Algerian gyres is highlighted by this climatology and confirmed by the cross-correlation of the cooling signal observed during the 1980s. The estimation of trends of LIW and WIW characteristics help to document their evolution. The acceleration of warming observed throughout the basin from 2010 is alarming. Glider observations have supported our conclusions regarding the effectiveness of mesoscale and submesoscale structures for the transport of water masses into the interior of the Algerian basin. Indeed, we observed WIW, LIW, and WMDW parcels within the Algerian Basin with more pronounced characteristics than adjacent waters

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Book chapters on the topic "Meso and submesoscale"

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Zatsepin, Andrey, Sergey Kuklev, Vladimir Ocherednik, Stanislav Myslenkov, Oleg Podymov, and Ksenia Silvestrova. "Study of meso- and submesoscale hydrophysical processes on continental shelf and slope with remote and contact methods." In Some results of multidisciplinary coastal expedition «Black Sea-2017» at R/V «Ashamba», 16–43. Nauchnyj Mir, 2018. http://dx.doi.org/10.29006/978-5-91522-472-7-2018.1.

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Ruiz, Simon, Amala Mahadevan, Ananda Pascual, Mariona Claret, Joaquin Tintore, and Evan Mason. "Multi‐Platform Observations and Numerical Simulations to Understand Meso and Submesoscale Processes: A Case Study of Vertical Velocities in the Western Mediterranean." In New Frontiers in Operational Oceanography. GODAE OceanView, 2018. http://dx.doi.org/10.17125/gov2018.ch05.

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Conference papers on the topic "Meso and submesoscale"

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Nechaev, Andrei Martenovich, Alexander Alekseyevich Soloviev, and Dmitry Alexandrovich Soloviev. "ABOUT THE HYDRODYNAMIC MECHANISM OF FORMATION OF MESO-SCALE CYCLONIC VORTEXES." In The International Symposium “Mesoscale and Submesoscale Processes in the Hydrosphere and Atmosphere”. Shirshov Institute of Oceanology of Russian Academy of Sciences, 2018. http://dx.doi.org/10.29006/978-5-9901449-4-1-2018-71.

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Evstigneeva, Natalia, Natalia Evstigneeva, Sergey Demyshev, and Sergey Demyshev. "NUMERICAL SIMULATION OF MESO- AND SUBMESOSCALE FEATURES OF THE NORTH-WESTERN BLACK SEA SHELF CIRCULATION USING HIGH SPATIAL RESOLUTION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b943490dd49.54668884.

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A numerical experiment on reconstruction of currents was conducted with real atmospheric forcing data in autumn period of 2007 on the basis of Marine hydrophysical institute (MHI) hydrodynamic model, which was adapted to the coastal area of the Black Sea with an open boundary (north-western shelf). A high resolution (horizontal grid 500500 m and 44 verti-cal layers from 1 m to 49 m) and detailed bathymetry with resolution ~1.6 km were used in the calculation. A higher spatial resolution allowed to get a detailed mesoscale and sub-mesoscale structure of currents in the upper and deep layers of the north-western shelf and to obtain quantitative and qualitative characteristics of the eddies and jets more accurately in comparison with previous calculations.

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Evstigneeva, Natalia, Natalia Evstigneeva, Sergey Demyshev, and Sergey Demyshev. "NUMERICAL SIMULATION OF MESO- AND SUBMESOSCALE FEATURES OF THE NORTH-WESTERN BLACK SEA SHELF CIRCULATION USING HIGH SPATIAL RESOLUTION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b4316337b1b.

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A numerical experiment on reconstruction of currents was conducted with real atmospheric forcing data in autumn period of 2007 on the basis of Marine hydrophysical institute (MHI) hydrodynamic model, which was adapted to the coastal area of the Black Sea with an open boundary (north-western shelf). A high resolution (horizontal grid 500500 m and 44 verti-cal layers from 1 m to 49 m) and detailed bathymetry with resolution ~1.6 km were used in the calculation. A higher spatial resolution allowed to get a detailed mesoscale and sub-mesoscale structure of currents in the upper and deep layers of the north-western shelf and to obtain quantitative and qualitative characteristics of the eddies and jets more accurately in comparison with previous calculations.

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