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Journal articles on the topic 'Mesoscale eddy'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Chelton, Dudley. "Mesoscale eddy effects." Nature Geoscience 6, no. 8 (2013): 594–95. http://dx.doi.org/10.1038/ngeo1906.

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2

Canuto, V. M., M. S. Dubovikov, M. Luneva, C. A. Clayson, and A. Leboissetier. "Mixed layer mesoscales: a parameterization for OGCMs." Ocean Science Discussions 7, no. 2 (2010): 873–917. http://dx.doi.org/10.5194/osd-7-873-2010.

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Abstract. We derive and assess a parameterization of the mixed layer vertical and horizontal mesoscale fluxes of an arbitrary tracer. The results, which are obtained by solving the mesoscale dynamic equations and contain no adjustable parameters, are expressed in terms of the large scale fields resolved by coarse resolution OGCMs (ocean global circulation models). The new model can be put in the right perspective by considering the following. Thus far, the lack of a mixed layer mesoscale model that naturally satisfies the required boundary condition (the vertical flux must vanish at the surfac

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3

Gasset, Nicolas, Robert Benoit, and Christian Masson. "Implementing Large-Eddy Simulation Capability in a Compressible Mesoscale Model." Monthly Weather Review 142, no. 8 (2014): 2733–50. http://dx.doi.org/10.1175/mwr-d-13-00257.1.

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Abstract The large size of modern wind turbines and wind farms triggers processes above the surface layer, which extend to the junction between microscales and mesoscales, and pushes the limits of existing approaches to predict the wind. The main objectives of this study are thus to introduce and evaluate an approach that will better account for physical processes within the atmospheric boundary layer (ABL), and allow for both microscale and mesoscale modeling. The proposed method, in which mathematical model and main numerical aspects are presented, combines a mesoscale approach with a large-

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4

Barkan, Roy, Kraig B. Winters, and James C. McWilliams. "Stimulated Imbalance and the Enhancement of Eddy Kinetic Energy Dissipation by Internal Waves." Journal of Physical Oceanography 47, no. 1 (2017): 181–98. http://dx.doi.org/10.1175/jpo-d-16-0117.1.

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AbstractThe effects of internal waves (IWs), externally forced by high-frequency wind, on energy pathways are studied in submesoscale-resolving numerical simulations of an idealized wind-driven channel flow. Two processes are examined: the direct extraction of mesoscale energy by externally forced IWs followed by an IW forward energy cascade to dissipation and stimulated imbalance, a mechanism through which externally forced IWs trigger a forward mesoscale to submesoscale energy cascade to dissipation. This study finds that the frequency and wavenumber spectral slopes are shallower in solution

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Yang, Yang, Robert H. Weisberg, Yonggang Liu, and X. San Liang. "Instabilities and Multiscale Interactions Underlying the Loop Current Eddy Shedding in the Gulf of Mexico." Journal of Physical Oceanography 50, no. 5 (2020): 1289–317. http://dx.doi.org/10.1175/jpo-d-19-0202.1.

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AbstractA recently developed tool, the multiscale window transform, along with the theory of canonical energy transfer is used to investigate the roles of multiscale interactions and instabilities in the Gulf of Mexico Loop Current (LC) eddy shedding. A three-scale energetics framework is employed, in which the LC system is reconstructed onto a background flow window, a mesoscale eddy window, and a high-frequency eddy window. The canonical energy transfer between the background flow and the mesoscale windows plays an important role in LC eddy shedding. Barotropic instability contributes to the

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6

Eden, Carsten, and Richard J. Greatbatch. "Towards a mesoscale eddy closure." Ocean Modelling 20, no. 3 (2008): 223–39. http://dx.doi.org/10.1016/j.ocemod.2007.09.002.

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7

Ferrari, Raffaele, James C. McWilliams, Vittorio M. Canuto, and Mikhail Dubovikov. "Parameterization of Eddy Fluxes near Oceanic Boundaries." Journal of Climate 21, no. 12 (2008): 2770–89. http://dx.doi.org/10.1175/2007jcli1510.1.

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Abstract In the stably stratified interior of the ocean, mesoscale eddies transport materials by quasi-adiabatic isopycnal stirring. Resolving or parameterizing these effects is important for modeling the oceanic general circulation and climate. Near the bottom and near the surface, however, microscale boundary layer turbulence overcomes the adiabatic, isopycnal constraints for the mesoscale transport. In this paper a formalism is presented for representing this transition from adiabatic, isopycnally oriented mesoscale fluxes in the interior to the diabatic, along-boundary mesoscale fluxes nea

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8

Lian, Zhan, Baonan Sun, Zexun Wei, Yonggang Wang, and Xinyi Wang. "Comparison of Eight Detection Algorithms for the Quantification and Characterization of Mesoscale Eddies in the South China Sea." Journal of Atmospheric and Oceanic Technology 36, no. 7 (2019): 1361–80. http://dx.doi.org/10.1175/jtech-d-18-0201.1.

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AbstractNumerous oceanic mesoscale eddies occur in the South China Sea (SCS). The present study employs eight automatic eddy detection algorithms to identify these mesoscale eddies and compares the results. Eddy probabilities and areas detected by various algorithms differ substantially. Most regions of the SCS with a high discrepancy of eddy probabilities are those with few mesoscale eddies, except for the area west of the Luzon Strait, the area west of Luzon Island between 12° and 17°N, and the southernmost end of the SCS basin. They are primarily caused by strong interference, noncircular e

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9

Klocker, Andreas, and Ryan Abernathey. "Global Patterns of Mesoscale Eddy Properties and Diffusivities." Journal of Physical Oceanography 44, no. 3 (2014): 1030–46. http://dx.doi.org/10.1175/jpo-d-13-0159.1.

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Abstract Mesoscale eddies play a major role in the transport of tracers in the ocean. Focusing on a sector in the east Pacific, the authors present estimates of eddy diffusivities derived from kinematic tracer simulations using satellite-observed velocity fields. Meridional diffusivities are diagnosed, and how they are related to eddy properties through the mixing length formulation of Ferrari and Nikurashin, which accounts for the suppression of diffusivity due to eddy propagation relative to the mean flow, is shown. The uniqueness of this study is that, through systematically varying the zon

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10

Eden, Carsten. "Anisotropic Rotational and Isotropic Residual Isopycnal Mesoscale Eddy Fluxes." Journal of Physical Oceanography 40, no. 11 (2010): 2511–24. http://dx.doi.org/10.1175/2010jpo4397.1.

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Abstract In the generalized temporal residual mean (TRM-G) framework, the diapycnal rotational eddy fluxes are defined such that the residual divergent diapycnal eddy flux is related to irreversible changes of buoyancy, that is, diapycnal mixing (or temporal changes of variance and higher order moments) only. Here, it is discussed that for the isopycnal eddy fluxes a similar physically meaningful property exists: rotational isopycnal eddy fluxes can be defined in TRM-G such that the residual divergent part of the flux is related to removal of mean available potential energy and transfer to edd

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11

Ni, Qinbiao, Xiaoming Zhai, Guihua Wang, and David P. Marshall. "Random Movement of Mesoscale Eddies in the Global Ocean." Journal of Physical Oceanography 50, no. 8 (2020): 2341–57. http://dx.doi.org/10.1175/jpo-d-19-0192.1.

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AbstractIn this study we track and analyze eddy movement in the global ocean using 20 years of altimeter data and show that, in addition to the well-known westward propagation and slight polarity-based meridional deflections, mesoscale eddies also move randomly in all directions at all latitudes as a result of eddy–eddy interaction. The speed of this random eddy movement decreases with latitude and equals the baroclinic Rossby wave speed at about 25° of latitude. The tracked eddies are on average isotropic at mid- and high latitudes, but become noticeably more elongated in the zonal direction

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12

Wang, Qiang, Lili Zeng, Jian Li, et al. "Observed Cross-Shelf Flow Induced by Mesoscale Eddies in the Northern South China Sea." Journal of Physical Oceanography 48, no. 7 (2018): 1609–28. http://dx.doi.org/10.1175/jpo-d-17-0180.1.

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AbstractCross-shelf flow induced by mesoscale eddies has been investigated in the northern South China Sea (NSCS) using velocity observations from Long Ranger ADCP moorings. Mesoscale eddies influenced the three mooring stations during almost all the observation period. Four quadrants have been defined with the mooring location as the origin, and it is found that warm (cold) mesoscale eddies induce onshore (offshore) movement in the eastern two quadrants and offshore (onshore) movement in the western two quadrants. When an eddy propagates past a mooring station, net cross-shelf flow at the moo

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13

Mak, J., J. R. Maddison, D. P. Marshall, and D. R. Munday. "Implementation of a Geometrically Informed and Energetically Constrained Mesoscale Eddy Parameterization in an Ocean Circulation Model." Journal of Physical Oceanography 48, no. 10 (2018): 2363–82. http://dx.doi.org/10.1175/jpo-d-18-0017.1.

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AbstractThe global stratification and circulation, as well as their sensitivities to changes in forcing, depend crucially on the representation of the mesoscale eddy field in a numerical ocean circulation model. Here, a geometrically informed and energetically constrained parameterization framework for mesoscale eddies—termed Geometry and Energetics of Ocean Mesoscale Eddies and Their Rectified Impact on Climate (GEOMETRIC)—is proposed and implemented in three-dimensional channel and sector models. The GEOMETRIC framework closes eddy buoyancy fluxes according to the standard Gent–McWilliams sc

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14

Delman, Andrew, and Tong Lee. "Global contributions of mesoscale dynamics to meridional heat transport." Ocean Science 17, no. 4 (2021): 1031–52. http://dx.doi.org/10.5194/os-17-1031-2021.

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Abstract. Mesoscale ocean processes are prevalent in many parts of the global oceans and may contribute substantially to the meridional movement of heat. Yet earlier global surveys of meridional temperature fluxes and heat transport (HT) have not formally distinguished between mesoscale and large-scale contributions, or they have defined eddy contributions based on temporal rather than spatial characteristics. This work uses spatial filtering methods to separate large-scale (gyre and planetary wave) contributions from mesoscale (eddy, recirculation, and tropical instability wave) contributions

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15

Chang, Yu-Lin, Yasumasa Miyazawa, and Xinyu Guo. "Effect of Mesoscale Eddies on the Taiwan Strait Current." Journal of Physical Oceanography 45, no. 6 (2015): 1651–66. http://dx.doi.org/10.1175/jpo-d-14-0248.1.

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AbstractThis study shows that mesoscale eddies can alter the Taiwan Strait Current. The 20-yr data-assimilated Japan Coastal Ocean Predictability Experiment 2 (JCOPE2) reanalysis data are analyzed, and the results are confirmed with idealized experiments. The leading wind-forced seasonal cycle is excluded to focus on the effect of the eddy. The warm eddy southwest of Taiwan is shown to generate a northward flow, whereas the cold eddy produces a southward current. The effect of the eddy penetrates onto the shelf through the joint effect of baroclinicity and relief (JEBAR). The cross-isobath flu

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16

Saenko, Oleg A., Duo Yang, and Jonathan M. Gregory. "Impact of Mesoscale Eddy Transfer on Heat Uptake in an Eddy-Parameterizing Ocean Model." Journal of Climate 31, no. 20 (2018): 8589–606. http://dx.doi.org/10.1175/jcli-d-18-0186.1.

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Using a set of experiments with an eddy-parameterizing ocean model, it is found that the strength of the Atlantic meridional overturning circulation (AMOC) intensifies with the decrease of the density-dependent mesoscale eddy transfer. However, the intensification is weaker than that suggested by simple scaling relationships previously applied. Perturbing the model control sea surface temperature (SST) to mimic its change in response to doubling of CO2, it is shown that the associated ocean heat uptake (OHU) increases and penetrates deeper with the decrease of the mesoscale eddy transfer. It i

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17

Polzin, Kurt L. "Mesoscale Eddy–Internal Wave Coupling. Part II: Energetics and Results from PolyMode." Journal of Physical Oceanography 40, no. 4 (2010): 789–801. http://dx.doi.org/10.1175/2009jpo4039.1.

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Abstract The issue of internal wave–mesoscale eddy interactions is revisited. Previous observational work identified the mesoscale eddy field as a possible source of internal wave energy. Characterization of the coupling as a viscous process provides a smaller horizontal transfer coefficient than previously obtained, with vh ≅ 50 m2 s−1 in contrast to νh ≅ 200–400 m2 s−1, and a vertical transfer coefficient bounded away from zero, with νυ + ( f 2/N 2)Kh ≅ 2.5 ± 0.3 × 10−3 m2 s−1 in contrast to νυ + ( f 2/N 2)Kh = 0 ± 2 × 10−2 m2 s−1. Current meter data from the Local Dynamics Experiment of the

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18

Martin, Adrian P., Kelvin J. Richards, Cliff S. Law, and Malcolm Liddicoat. "Horizontal dispersion within an anticyclonic mesoscale eddy." Deep Sea Research Part II: Topical Studies in Oceanography 48, no. 4-5 (2001): 739–55. http://dx.doi.org/10.1016/s0967-0645(00)00095-3.

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19

Lee, Hyo Sang, and C. L. Parsons. "Mesoscale ocean eddy measurements by multibeam altimetry." Journal of Geophysical Research 91, no. C8 (1986): 9693. http://dx.doi.org/10.1029/jc091ic08p09693.

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20

Shang, E. C., and Y. Y. Wang. "Acoustic modal features associated with mesoscale eddy." Journal of the Acoustical Society of America 88, S1 (1990): S141—S142. http://dx.doi.org/10.1121/1.2028634.

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21

Kizner, Ziv, Biana Shteinbuch-Fridman, Viacheslav Makarov, and Michael Rabinovich. "Cycloidal meandering of a mesoscale anticyclonic eddy." Physics of Fluids 29, no. 8 (2017): 086601. http://dx.doi.org/10.1063/1.4996772.

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22

Liu, Jiaqi, Shengchun Piao, Lijia Gong, Minghui Zhang, Yongchao Guo, and Shizhao Zhang. "The Effect of Mesoscale Eddy on the Characteristic of Sound Propagation." Journal of Marine Science and Engineering 9, no. 8 (2021): 787. http://dx.doi.org/10.3390/jmse9080787.

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A mesoscale eddy is detected and tracked in the western North Pacific region. Within the life cycle of the cyclonic eddies, the intensities of eddies make a difference. Satellite images indicate the oceanic eddy keeps westward-moving until it disappears. Oceanographic and acoustic characteristics of the eddy are studied. The acoustic energy distribution results from the different intensity of both modelled eddy and measured eddy are calculated. With sound propagation through the cyclonic eddy and anticyclonic eddy, the position of convergence zone moves away from and towards the acoustic sourc

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23

Bates, Michael, Ross Tulloch, John Marshall, and Raffaele Ferrari. "Rationalizing the Spatial Distribution of Mesoscale Eddy Diffusivity in Terms of Mixing Length Theory." Journal of Physical Oceanography 44, no. 6 (2014): 1523–40. http://dx.doi.org/10.1175/jpo-d-13-0130.1.

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Abstract Observations and theory suggest that lateral mixing by mesoscale ocean eddies only reaches its maximum potential at steering levels, surfaces at which the propagation speed of eddies approaches that of the mean flow. Away from steering levels, mixing is strongly suppressed because the mixing length is smaller than the eddy scale, thus reducing the mixing rates. The suppression is particularly pronounced in strong currents where mesoscale eddies are most energetic. Here, a framework for parameterizing eddy mixing is explored that attempts to capture this suppression. An expression of t

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24

Shan, Xuan, Zhao Jing, Bingrong Sun, Ping Chang, Lixin Wu, and Xiaohui Ma. "Influence of the Ocean Mesoscale Eddy–Atmosphere Thermal Feedback on the Upper-Ocean Haline Stratification." Journal of Physical Oceanography 50, no. 9 (2020): 2475–90. http://dx.doi.org/10.1175/jpo-d-19-0193.1.

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AbstractThe ocean mesoscale eddy–atmosphere (OME-A) interaction through the eddy-induced sea surface temperature anomaly can feedback on ocean dynamics in various ways (referred to as the OME-A thermal feedback). In this study, the influence of the OME-A thermal feedback on the upper-ocean haline structure is analyzed based on high-resolution coupled simulations. In the Oyashio Extension where pronounced surface temperature and salinity fronts are collocated, the haline stratification in the upper 200 m is significantly enhanced by the OME-A thermal feedback. This enhancement is mainly attribu

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25

Yang, Shengmu, Jiuxing Xing, Daoyi Chen, and Shengli Chen. "A modelling study of eddy-splitting by an island/seamount." Ocean Science 13, no. 5 (2017): 837–49. http://dx.doi.org/10.5194/os-13-837-2017.

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Abstract. A mesoscale eddy's trajectory and its interaction with topography under the planetary β and nonlinear effects in the South China Sea are examined using the MIT General Circulation Model (MITgcm). Warm eddies propagate to the southwest while cold eddies propagate to the northwest. The propagation speed of both warm and cold eddies is about 2.4 km day−1 in the model. The eddy trajectory and its structure are affected by an island or a seamount, in particular, under certain conditions, the eddy may split during the interaction with an island/seamount. We focus this research on two param

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26

Gaube, Peter, Dudley B. Chelton, Roger M. Samelson, Michael G. Schlax, and Larry W. O’Neill. "Satellite Observations of Mesoscale Eddy-Induced Ekman Pumping." Journal of Physical Oceanography 45, no. 1 (2015): 104–32. http://dx.doi.org/10.1175/jpo-d-14-0032.1.

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AbstractThree mechanisms for self-induced Ekman pumping in the interiors of mesoscale ocean eddies are investigated. The first arises from the surface stress that occurs because of differences between surface wind and ocean velocities, resulting in Ekman upwelling and downwelling in the cores of anticyclones and cyclones, respectively. The second mechanism arises from the interaction of the surface stress with the surface current vorticity gradient, resulting in dipoles of Ekman upwelling and downwelling. The third mechanism arises from eddy-induced spatial variability of sea surface temperatu

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27

Delman, Andrew, and Tong Lee. "A new method to assess mesoscale contributions to meridional heat transport in the North Atlantic Ocean." Ocean Science 16, no. 4 (2020): 979–95. http://dx.doi.org/10.5194/os-16-979-2020.

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Abstract. The meridional heat transport (MHT) in the North Atlantic is critically important to climate variability and the global overturning circulation. A wide range of ocean processes contribute to North Atlantic MHT, ranging from basin-scale overturning and gyre motions to mesoscale instabilities (such as eddies). However, previous analyses of “eddy” MHT in the region have mostly focused on the contributions of time-variable velocity and temperature, rather than considering the association of MHT with distinct spatial scales within the basin. In this study, a zonal spatial-scale decomposit

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28

Canuto, V. M., Y. Cheng, M. S. Dubovikov, A. M. Howard, and A. Leboissetier. "Parameterization of Mixed Layer and Deep-Ocean Mesoscales including Nonlinearity." Journal of Physical Oceanography 48, no. 3 (2018): 555–72. http://dx.doi.org/10.1175/jpo-d-16-0255.1.

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AbstractIn 2011, Chelton et al. carried out a comprehensive census of mesoscales using altimetry data and reached the following conclusions: “essentially all of the observed mesoscale features are nonlinear” and “mesoscales do not move with the mean velocity but with their own drift velocity,” which is “the most germane of all the nonlinear metrics.” Accounting for these results in a mesoscale parameterization presents conceptual and practical challenges since linear analysis is no longer usable and one needs a model of nonlinearity. A mesoscale parameterization is presented that has the follo

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29

Busecke, Julius J. M., and Ryan P. Abernathey. "Ocean mesoscale mixing linked to climate variability." Science Advances 5, no. 1 (2019): eaav5014. http://dx.doi.org/10.1126/sciadv.aav5014.

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Mesoscale turbulence in the ocean strongly affects the circulation, water mass formation, and transport of tracers. Little is known, however, about how mixing varies on climate timescales. We present the first time-resolved global dataset of lateral mesoscale eddy diffusivities at the ocean surface, obtained by applying the suppressed mixing length theory to satellite-observed velocities. We find interannual variability throughout the global ocean, regionally correlated with climate indices such as ENSO, NAO, DMI, and PDO. Changes in mixing length, driven by variations in the large-scale flow,

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30

Grooms, Ian, Louis-Philippe Nadeau, and K. Shafer Smith. "Mesoscale Eddy Energy Locality in an Idealized Ocean Model." Journal of Physical Oceanography 43, no. 9 (2013): 1911–23. http://dx.doi.org/10.1175/jpo-d-13-036.1.

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Abstract This paper investigates the energy budget of mesoscale eddies in wind-driven two-layer quasigeostrophic simulations. Intuitively, eddy energy can be generated, dissipated, and fluxed from place to place; regions where the budget balances generation and dissipation are “local” and regions that export or import large amounts of eddy energy are “nonlocal.” Many mesoscale parameterizations assume that statistics of the unresolved eddies behave as local functions of the resolved large scales, and studies that relate doubly periodic simulations to ocean patches must assume that the ocean pa

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31

Colas, François, Xavier Capet, James C. McWilliams, and Zhijin Li. "Mesoscale Eddy Buoyancy Flux and Eddy-Induced Circulation in Eastern Boundary Currents." Journal of Physical Oceanography 43, no. 6 (2013): 1073–95. http://dx.doi.org/10.1175/jpo-d-11-0241.1.

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Abstract A dynamical interpretation is made of the mesoscale eddy buoyancy fluxes in the Eastern Boundary Currents off California and Peru–Chile, based on regional equilibrium simulations. The eddy fluxes are primarily shoreward and upward across a swath several hundred kilometers wide in the upper ocean; as such they serve to balance mean offshore air–sea heating and coastal upwelling. In the stratified interior the eddy fluxes are consistent with the adiabatic hypothesis associated with a mean eddy-induced velocity advecting mean buoyancy and tracers. Furthermore, with a suitable gauge choic

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32

Duo, Zijun, Wenke Wang, and Huizan Wang. "Oceanic Mesoscale Eddy Detection Method Based on Deep Learning." Remote Sensing 11, no. 16 (2019): 1921. http://dx.doi.org/10.3390/rs11161921.

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Oceanic mesoscale eddies greatly influence energy and matter transport and acoustic propagation. However, the traditional detection method for oceanic mesoscale eddies relies too much on the threshold value and has significant subjectivity. The existing machine learning methods are not mature or purposeful enough, as their train set lacks authority. In view of the above problems, this paper constructs a mesoscale eddy automatic identification and positioning network—OEDNet—based on an object detection network. Firstly, 2D image processing technology is used to enhance the data of a small numbe

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Huang, Xiaodong, Zhiwei Zhang, Xiaojiang Zhang, Hongbao Qian, Wei Zhao, and Jiwei Tian. "Impacts of a Mesoscale Eddy Pair on Internal Solitary Waves in the Northern South China Sea revealed by Mooring Array Observations." Journal of Physical Oceanography 47, no. 7 (2017): 1539–54. http://dx.doi.org/10.1175/jpo-d-16-0111.1.

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AbstractBoth internal solitary waves (ISWs) and mesoscale eddies are ubiquitous in the northern South China Sea (SCS). In this study, the authors examine the impacts of mesoscale eddies on the ISWs transiting the northern SCS deep basin that evolve from the steepening internal tide generated in the Luzon Strait, using in situ data collected from a specifically designed mooring array. From November 2013 to January 2014, an energetic mesoscale eddy pair consisting of one anticyclonic eddy (AE) and one cyclonic eddy (CE) propagated across the mooring array. Observations revealed that the amplitud

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Samelson, R. M., M. G. Schlax, and D. B. Chelton. "A Linear Stochastic Field Model of Midlatitude Mesoscale Variability." Journal of Physical Oceanography 46, no. 10 (2016): 3103–20. http://dx.doi.org/10.1175/jpo-d-16-0060.1.

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AbstractA semiempirical model of midlatitude sea surface height (SSH) variability is formulated and tested against two decades of weekly global fields of merged altimeter data. The model is constrained to match approximately the observed SSH wavenumber power spectrum, but it predicts the spatiotemporal SSH field structure as a propagating, damped, linear response to a stochastic forcing field. An objective, coherent-eddy identification and tracking procedure is applied to the model and altimeter SSH fields, with a focus on eddies with lifetimes L ≥ 16 weeks. The model eddy dataset reproduces t

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Lu, Jianhua, Fuchang Wang, Hailong Liu, and Pengfei Lin. "Stationary mesoscale eddies, upgradient eddy fluxes, and the anisotropy of eddy diffusivity." Geophysical Research Letters 43, no. 2 (2016): 743–51. http://dx.doi.org/10.1002/2015gl067384.

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Liu, Yingjie, Ge Chen, Miao Sun, Shuai Liu, and Fenglin Tian. "A Parallel SLA-Based Algorithm for Global Mesoscale Eddy Identification." Journal of Atmospheric and Oceanic Technology 33, no. 12 (2016): 2743–54. http://dx.doi.org/10.1175/jtech-d-16-0033.1.

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AbstractThis paper proposes a new algorithm for parallel identification of mesoscale eddies from global satellite altimetry data. By simplifying the recognition process and the sea level anomaly (SLA) contours’ search range, the method improves identification efficiency compared with the previous SSH-based method even in the single-threaded process. The global SLA map is divided into several regions. These regions are identified simultaneously with a new SSH-based method. All the eddy identification results of these regions are merged seamlessly into a global eddy map. A β-plane approximation

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37

Li, Qiu-Yang, Liang Sun, and Sheng-Fu Lin. "GEM: a dynamic tracking model for mesoscale eddies in the ocean." Ocean Science 12, no. 6 (2016): 1249–67. http://dx.doi.org/10.5194/os-12-1249-2016.

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Abstract. The Genealogical Evolution Model (GEM) presented here is an efficient logical model used to track dynamic evolution of mesoscale eddies in the ocean. It can distinguish between different dynamic processes (e.g., merging and splitting) within a dynamic evolution pattern, which is difficult to accomplish using other tracking methods. To this end, the GEM first uses a two-dimensional (2-D) similarity vector (i.e., a pair of ratios of overlap area between two eddies to the area of each eddy) rather than a scalar to measure the similarity between eddies, which effectively solves the “miss

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Perezhogin, Pavel A. "Testing of kinetic energy backscatter parameterizations in the NEMO ocean model." Russian Journal of Numerical Analysis and Mathematical Modelling 35, no. 2 (2020): 69–82. http://dx.doi.org/10.1515/rnam-2020-0006.

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Abstract Eddy-permitting numerical ocean models resolve mesoscale turbulence only partly, that leads to underestimation of eddy kinetic energy (EKE). Mesoscale dynamics can be amplified by using kinetic energy backscatter (KEB) parameterizations returning energy from the unresolved scales. We consider two types of KEB: stochastic and negative viscosity ones. The tuning of their amplitudes is based on a local budget of kinetic energy, thus, they are ‘energetically-consistent’ KEBs. In this work, the KEB parameterizations are applied to the NEMO ocean model in Double-Gyre configuration with an e

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Seifert, A., and T. Heus. "Large-eddy simulation of organized precipitating trade wind cumulus clouds." Atmospheric Chemistry and Physics Discussions 13, no. 1 (2013): 1855–89. http://dx.doi.org/10.5194/acpd-13-1855-2013.

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Abstract. Trade wind cumulus clouds often organize in along-wind cloud streets and across-wind mesoscale arcs. We present a benchmark large-eddy simulation which resolves the individual clouds as well as the mesoscale organization on scales of O(10 km). Different methods to quantify organization of cloud fields are applied and discussed. Using perturbed physics large-eddy simulations experiments the processes leading to the formation of cloud clusters and the mesoscale arcs are revealed. We find that both cold pools as well as the sub-cloud layer moisture field are crucial to understand the or

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Seifert, A., and T. Heus. "Large-eddy simulation of organized precipitating trade wind cumulus clouds." Atmospheric Chemistry and Physics 13, no. 11 (2013): 5631–45. http://dx.doi.org/10.5194/acp-13-5631-2013.

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Abstract. Trade wind cumulus clouds often organize in along-wind cloud streets and across-wind mesoscale arcs. We present a benchmark large-eddy simulation which resolves the individual clouds as well as the mesoscale organization on scales of O(10 km). Different methods to quantify organization of cloud fields are applied and discussed. Using perturbed physics large-eddy simulation experiments, the processes leading to the formation of cloud clusters and the mesoscale arcs are revealed. We find that both cold pools as well as the sub-cloud layer moisture field are crucial to understand the or

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Mason, Evan, Ananda Pascual, and James C. McWilliams. "A New Sea Surface Height–Based Code for Oceanic Mesoscale Eddy Tracking." Journal of Atmospheric and Oceanic Technology 31, no. 5 (2014): 1181–88. http://dx.doi.org/10.1175/jtech-d-14-00019.1.

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AbstractThis paper presents a software tool that enables the identification and automated tracking of oceanic eddies observed with satellite altimetry in user-specified regions throughout the global ocean. As input, the code requires sequential maps of sea level anomalies such as those provided by Archiving, Validation, and Interpretation of Satellite Oceanographic (AVISO) data. Outputs take the form of (i) data files containing eddy properties, including position, radius, amplitude, and azimuthal (geostrophic) speed; and (ii) sequential image maps showing sea surface height maps with active e

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Haller, G., and A. C. Poje. "Eddy growth and mixing in mesoscale oceanographic flows." Nonlinear Processes in Geophysics 4, no. 4 (1997): 223–35. http://dx.doi.org/10.5194/npg-4-223-1997.

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Abstract. We study the relation between changes in the Eulerian topology of a two dimensional flow and the mixing of fluid particles between qualitatively different regions of the flow. In general time dependent flows, streamlines and particle paths are unrelated. However, for many mesoscale oceanographic features such as detaching rings and meandering jets, the rate at which the Euierian structures evolve is considerably slower than typical advection speeds of Lagrangian tracers. In this note we show that for two-dimensional, adiabatic fluid flows there is a direct relationship between observ

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Callendar, W., J. M. Klymak, and M. G. G. Foreman. "Tidal generation of large sub-mesoscale eddy dipoles." Ocean Science 7, no. 4 (2011): 487–502. http://dx.doi.org/10.5194/os-7-487-2011.

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Abstract. Numerical simulations of tidal flow past Cape St. James on the south tip of Haida Gwaii (Queen Charlotte Islands) are presented that indicate mesoscale dipoles are formed from coalescing tidal eddies. Observations in this region demonstrate robust eddy generation at the Cape, with the primary process being flow separation of buoyant or wind driven outflows forming large anti-cyclonic, negative potential vorticity, Haida Eddies. However, there are other times where dipoles are observed in satellites, indicating a source of positive potential vorticity must also be present. The simulat

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Callendar, W., J. M. Klymak, and M. G. G. Foreman. "Tidal generation of large sub-mesoscale eddy dipoles." Ocean Science Discussions 8, no. 2 (2011): 723–60. http://dx.doi.org/10.5194/osd-8-723-2011.

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Abstract. Numerical simulations of tidal flow past Cape St. James on the south tip of Haida Gwai (Queen Charlotte Islands) are presented that indicate mesoscale dipoles are formed from coalescing tidal eddies. Observations in this region demonstrate robust eddy generation at the Cape, with the primary process being flow separation of buoyant or wind driven outflows forming large anti-cyclonic, negative potential vorticity, Haida Eddies. However, there are other times where dipoles are observed in satellites, indicating a source of positive potential vorticity must also be present. The simulati

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Petkilev, P. S. "Review of mesoscale eddy detection and tracking algorithms." Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa 14, no. 3 (2017): 27–47. http://dx.doi.org/10.21046/2070-7401-2017-14-3-27-47.

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Shang, E. C., Y. Y. Wang, and A. G. Voronovich. "Acoustic travel time biases caused by mesoscale eddy." Journal of the Acoustical Society of America 97, no. 5 (1995): 3249. http://dx.doi.org/10.1121/1.411709.

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Shang, E. C. "Mode coupling caused by a mesoscale oceanic eddy." Journal of the Acoustical Society of America 85, S1 (1989): S70—S71. http://dx.doi.org/10.1121/1.2027115.

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Wang, Zi-Fei, Liang Sun, Qiu-Yang Li, and Hao Cheng. "Two typical merging events of oceanic mesoscale anticyclonic eddies." Ocean Science 15, no. 6 (2019): 1545–59. http://dx.doi.org/10.5194/os-15-1545-2019.

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Abstract. The long-term theoretical “energy paradox” of whether the final state of two merging anticyclones contains more energy than the initial state is studied by considering two typical merging events of ocean mesoscale eddies. The results demonstrate that the total mass (volume), total circulation (area integration of vorticity), and total angular momentum (AM) are conserved if the orbital AM relative to the center of mass is taken into account as the eddies rotate around the center of mass before merging. For subsurface merging, the mass trapped by the Taylor–Proudman effect above the su

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Ikeda, Motoyoshi. "Mesoscale eddy formation and evolution in the ice-covered ocean." Annals of Glaciology 15 (1991): 139–47. http://dx.doi.org/10.3189/1991aog15-1-139-147.

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Generation mechanisms of mesoscale eddies in the ice-covered ocean are studied by using numerical ice–ocean models and discussed with reference to previous papers. The three possible mechanisms of eddy generation, with sea ice as a passive tracer, are current instability, current-eddy interaction and current–bottom topography interaction. The current instability, categorized into barotropic and baroclinic instabilities, may be responsible for eddies near the ice edge associated with a strong current. An eddy can interact with a current, producing additional eddies, where stability of the curre

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Ikeda, Motoyoshi. "Mesoscale eddy formation and evolution in the ice-covered ocean." Annals of Glaciology 15 (1991): 139–47. http://dx.doi.org/10.1017/s0260305500009666.

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Generation mechanisms of mesoscale eddies in the ice-covered ocean are studied by using numerical ice–ocean models and discussed with reference to previous papers. The three possible mechanisms of eddy generation, with sea ice as a passive tracer, are current instability, current-eddy interaction and current–bottom topography interaction. The current instability, categorized into barotropic and baroclinic instabilities, may be responsible for eddies near the ice edge associated with a strong current. An eddy can interact with a current, producing additional eddies, where stability of the curre

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