Statistical analysis of Lagrangian transport of subtropical waters in the Japan Sea based on AVISO altimetry data

Prants, S. V.; Budyansky, M. V.; Uleysky, M. Yu.

doi:10.5194/npg-24-89-2017

Cited by 12 publications

(4 citation statements)

References 32 publications

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“…The frontal eddies in the northwestern JS are also interesting because they form in the area where warm subtropical and cold subarctic waters mix with an impact on marine ecosystem. It may be important for understanding transport pathways [16,20] for invasions of subtropical species. Since the last decades in the twentieth century, invasions of warm-water fish (conger eel, tuna, moonfish and triggerfish) and some tropical and subtropical marine organisms (turtles, sharks and others) have been observed more and more often in the northwestern JES, near the coast of Russia [21].…”

Section: Introductionmentioning

confidence: 99%

Evolution and Structure of a Mesoscale Anticyclonic Eddy in the Northwestern Japan Sea and Its Exchange with Surrounding Waters: In Situ Observations and Lagrangian Analysis

Budyansky,

Ladychenko,

Lobanov

et al. 2023

Preprint

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We have found a region in the northwestern Japan Sea near the Subpolar Front where mesoscale eddies regularly form and circulate. The anticyclonic eddy with a strong dynamic feature, vertically extended to the bottom (~3500 m), multilayer core structure and extreme values of temperature and salinity was sampled there in the cruise in May 2004. The altimetry-based eddy tracking showed that it had a life span of nine months with the size reaching 120 km. CTD observational data were used to explore the eddy’s features and vertical structure. The eddy had a multilayer core with different thermohaline characteristics which could be originated by eddy interaction with the surrounding waters during its life. The evolution of the eddy has been studied and analyzed with the help of altimetry-based Lagrangian indicators of water motion. Performing the particle-tracking numerical experiments, we computed the Lagrangian maps that contain information on the origin of water inside the eddy core and its ‘age’ on every day of the eddy’s life. Inspecting daily-computed Lagrangian maps, we documented the essential events in the evolution of the eddy including its formation, splitting, merger, entrainment and detrainment of water, erosion and eventual decay. All these observations have been verified with the infrared satellite images. The new Lagrangian technique has been applied to calculate day by day the content of water of various origin (coastal, subtropical and subarctic) entrained into the eddy core. It has been found that the surface core has been filled mainly with subtropical water originated in the southern flank of the Subpolar Front. The episodes with cardinal changes of ratio of different water types have been recorded and verified with the infrared satellite images and maps of the origin of water inside the eddy core.

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Section: Introductionmentioning

confidence: 99%

Evolution and Structure of a Mesoscale Anticyclonic Eddy in the Northwestern Japan Sea and Its Exchange with Surrounding Waters: In Situ Observations and Lagrangian Analysis

Budyansky,

Ladychenko,

Lobanov

et al. 2023

Preprint

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“…Some southward transport also occurs through the western and eastern transport corridors for the same reason. The transport of transformed subarctic water to the south is compared with the transport of transformed subtropical water to the north simulated by Prants et al (2017a). Andreev et al (2018) analyze circulation and transport in the Navarin Canyon area of the Bering Sea based on the altimetry-derived AVISO velocity field from 1993 to 2015.…”

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confidence: 99%

The international conference “Vortices and coherent structures: from ocean to microfluids”, Vladivostok, Russia, 28–31 August 2017

2019

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The international conference "Vortices and coherent structures: from ocean to microfluids" was held at the Pacific Oceanological Institute of the Russian Academy of Sciences in Vladivostok (Russia) from August 28 to August 31, 2017. The event gathered experimentalists and theoreticians, oceanographers and physicists, with a common interest in observing and modelling fluid flows in different media, from the ocean to laboratory flows. It was a fruitful idea to bring together researchers from a variety of backgrounds to benefit from a vigorous discussion of concepts across different disciplines in oceanography and hydrodynamics. Keywords Vortices • Waves • Coherent structures • Transport and mixing The present Topical Collection "Vortices, waves and coherent structures" contains 13 internationally peer-reviewed papers from participants of the conference providing an updated perspective on modelling a variety of vortex and wave motions, observation and simulation of transport and mixing processes in the ocean, observation and modelling of laboratory flows and novel tools for describing these processes. More details on these aspects are discussed in this preface. The serious hopes and prospects for further progress in understanding vortex and wave motions in geophysical, laboratory and model flows are essentially related to combined use of mathematical methods, computer simulation, laboratory experiments, satellite and in situ measurements. Such a multidisciplinary collaborations have led to interesting results that allow us to study the dynamical processes from

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“…It is also difficult to determine directly from these snapshots the means by which eddies appear, interact, and disappear and to track how they gain, retain, and release water. To delineate an eddy's contours and its deformations, it was proposed to use a displacement of particles from their initial positions (Prants et al, 2011a) and other Lagrangian indicators (Prants et al, 2017a(Prants et al, , 2017b(Prants et al, , 2017c that allow one to visualize not only the eddy's boundaries but also a history of the water masses involved in the vortical motion in the past.…”

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confidence: 99%

How Eddies Gain, Retain, and Release Water: A Case Study of a Hokkaido Anticyclone

2018

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A Lagrangian methodology is elaborated to identify the origin of water masses in the Kuroshio‐Oyashio frontal zone where waters of the Kuroshio Extension and Oyashio Current and of the Japan and Okhotsk Seas converge. It allows one to track the evolution of mesoscale eddies during the satellite‐altimetry era and to document how they gain, retain, and release water masses of different origin. The methodology is applied to study warm‐core mesoscale anticyclones propagating along the Japan and Kuril Trenches near the eastern coast of Hokkaido Island that have been observed from 1 January 1993 to 10 December 2016 in an altimetry‐based velocity field. The Hokkaido eddy, sampled by profiling floats and a few cruises in 2003 and 2004, is analyzed in detail in order to compare Lagrangian simulation results to observations.

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Statistical analysis of Lagrangian transport of subtropical waters in the Japan Sea based on AVISO altimetry data

Abstract: Northward near-surface

Cited by 12 publications

References 32 publications

Evolution and Structure of a Mesoscale Anticyclonic Eddy in the Northwestern Japan Sea and Its Exchange with Surrounding Waters: In Situ Observations and Lagrangian Analysis

Evolution and Structure of a Mesoscale Anticyclonic Eddy in the Northwestern Japan Sea and Its Exchange with Surrounding Waters: In Situ Observations and Lagrangian Analysis

The international conference “Vortices and coherent structures: from ocean to microfluids”, Vladivostok, Russia, 28–31 August 2017

How Eddies Gain, Retain, and Release Water: A Case Study of a Hokkaido Anticyclone

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