Lagrangian analysis of formation, structure, evolution and splitting of anticyclonic Kuril eddies

Prants, S. V.; Лобанов, В. Б.; Budyansky, M. V.; Uleysky, M. Yu.

doi:10.1016/j.dsr.2016.01.003

Cited by 26 publications

(15 citation statements)

References 44 publications

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“…Regarding zero‐dimensional stationary points with zero velocity, computed daily in the AVISO velocity field, we found that long‐lived elliptical points in the centers of mesoscale eddies were computed reliably. This statement is supported by comparison of their positions to many independent in situ and satellite observations of mesoscale eddies in the Kuroshio‐Oyashio frontal zone and other regions (for Bussol' eddies, see Prants et al (), for Kuroshio rings, see Budyansky et al (), and for Tohoku eddies, see Prants et al ()). The reason for this good coincidence is the smoothness of the AVISO field around the long‐lived elliptical points that allows one to fix them with an accuracy exceeding the nominal scale of the AVISO grid.…”

Section: Discussion On the Reliability Of Lagrangian Simulation With mentioning

confidence: 67%

“…We elaborated the Lagrangian methodology that allowed one to track, document, and record the behavior of eddies and identify the origin of water masses that were gained, retained, and released. For this purpose, Lagrangian maps seem to be more appropriate than commonly used Eulerian means because the Lagrangian maps are imprints of the history of water masses involved in the vortex motion, whereas vorticity, the Okubo‐Weiss parameter and similar Eulerian indicators are “instantaneous” snapshots (see Olascoaga et al, ; Prants et al, , for comparison). Daily computed Lagrangian maps are very useful in the study of the processes of entrainment and detrainment of waters to and from eddies and their dynamics.…”

Section: Resultsmentioning

confidence: 99%

“…The Kuril eddies, with cold and fresh core water, originate from the EKC and OC and form near the Bussol' Strait. They may propagate to the southwest along the Kuril Trench (Prants et al, ; Rogachev, ; Yasuda et al, ). Mesoscale eddies also occur along the northern and southern flanks of the Subarctic Front (Budyansky et al, ; Itoh & Yasuda, ).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussion On the Reliability Of Lagrangian Simulation With mentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

2018

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“…Systematic comparisons of Lagrangian structures against ground-truth patterns are rare and typically consider physical tracers (Despres et al 2011, Prants et al 2016. By comparing in situ hydrography with the altimetry-derived Lagrangian structure of a mesoscale eddy near the Kuril Islands, Prants et al (2016) found a precision of 7-20 km. Mismatches of 10-20 km are indeed typical when phytoplankton patterns as observed in satellite images are reconstructed with altimetry-derived Lagrangian techniques.…”

Section: Limitations Of the Lagrangian Methodsmentioning

confidence: 99%

A Satellite-Based Lagrangian View on Phytoplankton Dynamics

Lehahn

d’Ovidio

Koren

2018

Annu. Rev. Mar. Sci.

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The well-lit upper layer of the open ocean is a dynamical environment that hosts approximately half of global primary production. In the remote parts of this environment, distant from the coast and from the seabed, there is no obvious spatially fixed reference frame for describing the dynamics of the microscopic drifting organisms responsible for this immense production of organic matter-the phytoplankton. Thus, a natural perspective for studying phytoplankton dynamics is to follow the trajectories of water parcels in which the organisms are embedded. With the advent of satellite oceanography, this Lagrangian perspective has provided valuable information on different aspects of phytoplankton dynamics, including bloom initiation and termination, spatial distribution patterns, biodiversity, export of carbon to the deep ocean, and, more recently, bottom-up mechanisms that affect the distribution and behavior of higher-trophic-level organisms. Upcoming submesoscale-resolving satellite observations and swarms of autonomous platforms open the way to the integration of vertical dynamics into the Lagrangian view of phytoplankton dynamics.

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“…In spite of nonstationarity of the velocity field, some of them may exist for weeks and much more. The hyperbolic points and their attracting and repelling manifolds were recently identified with the help of drifter's tracks in the Gulf of La Spezia in the northwestern Mediterranean Sea (Haza et al, 2010), in the Gulf of Lion (Nencioli et al, 2011), in the Gulf of Mexico (Olascoaga et al, 2013) and in the northwestern Pacific (Prants et al, 2016).…”

Section: Methodsmentioning

confidence: 99%

Lagrangian simulation and tracking of the mesoscale eddies contaminated by Fukushima-derived radionuclides

2017

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Abstract. A Lagrangian methodology is developed to simulate, track, document and analyze the origin and history of water masses in ocean mesoscale features. It aims to distinguish whether water masses inside the mesoscale eddies originated from the main currents in the Kuroshio-Oyashio confluence zone. By computing trajectories for a large number of synthetic Lagrangian particles advected by the AVISO velocity field after the Fukushima accident, we identify and track the mesoscale eddies which were sampled in the cruises in 2011 and 2012 and estimate their risk of being contaminated by Fukushima-derived radionuclides. The simulated results are compared with in situ measurements, showing a good qualitative correspondence.

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Lagrangian analysis of formation, structure, evolution and splitting of anticyclonic Kuril eddies

Cited by 26 publications

References 44 publications

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

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

A Satellite-Based Lagrangian View on Phytoplankton Dynamics

Lagrangian simulation and tracking of the mesoscale eddies contaminated by Fukushima-derived radionuclides

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