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Artículos de revistas sobre el tema "Drifting speed of Lagrangian fronts"

Autor: Grafiati

Publicado: 25 de mayo de 2024

Última modificación: 31 de julio de 2025

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1

Fifani, Gina, Alberto Baudena, Milad Fakhri, et al. "Drifting Speed of Lagrangian Fronts and Oil Spill Dispersal at the Ocean Surface." Remote Sensing 13, no. 22 (2021): 4499. http://dx.doi.org/10.3390/rs13224499.

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Due to its dire impacts on marine life, public health, and socio-economic services, oil spills require an immediate response. Effective action starts with good knowledge of the ocean dynamics and circulation, from which Lagrangian methods derive key information on the dispersal pathways present in the contaminated region. However, precise assessments of the capacity of Lagrangian methods in real contamination cases remain rare and limited to large slicks spanning several hundreds of km. Here we address this knowledge gap and consider two medium-scale (tens of km wide) events of oil in contrast

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2

Heron, Mal, Roberto Gomez, Bernd Weber, et al. "Application of HF Radar in Hazard Management." International Journal of Antennas and Propagation 2016 (2016): 1–14. http://dx.doi.org/10.1155/2016/4725407.

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A review is given of the impact that HF radars are having on the management of coastal hazards. Maps of surface currents can be produced every 10–20 minutes which, in real time, improve navigation safety in restricted areas commonly found near ports and harbours. The time sequence of surface current maps enables Lagrangian tracking of small parcels of surface water, which enables hazard mitigation in managing suspended sediments in dredging, in emergency situations where flotsam and other drifting items need to be found, and in pollution control. The surface current measurement capability is u

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3

Nemoto, Masaki, Kouichi Nishimura, Syunichi Kobayashi, and Kaoru Izumi. "Numerical study of the time development of drifting snow and its relation to the spatial development." Annals of Glaciology 38 (2004): 343–50. http://dx.doi.org/10.3189/172756404781815202.

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AbstractThe time evolution of drifting snow under a steady wind is estimated using a new numerical model of drifting snow. In the model, Lagrangian stochastic theory is used to incorporate the effect of turbulence on the motion of drifting-snow particles. This method enables us to discuss both the saltation and the suspension process. Aerodynamic entrainment, grain/bed collision (splash process), wind modification and particle size distribution are also taken into account. The calculations show that the time needed by the total mass flux to reach a steady state appears to be 3–5 s. Vertical pr

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4

Wang, Dié, Emily C. Melvin, Noah Smith, et al. "TRACER Perspectives on Gulf-Breeze and Bay-Breeze Circulations and Coastal Convection." Monthly Weather Review 152, no. 10 (2024): 2207–28. http://dx.doi.org/10.1175/mwr-d-23-0292.1.

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Abstract This study explores gulf-breeze circulations (GBCs) and bay-breeze circulations (BBCs) in Houston–Galveston, investigating their characteristics, large-scale weather influences, and impacts on surface properties, boundary layer updrafts, and convective clouds. The results are derived from a combination of datasets, including satellite observations, ground-based measurements, and reanalysis datasets, using machine learning, changepoint detection method, and Lagrangian cell tracking. We find that anticyclonic synoptic patterns during the summer months (June–September) favor GBC/BBC form

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5

Lee, Daniel, Amandine Schaeffer, and Sjoerd Groeskamp. "Drifting dynamics of the bluebottle (<i>Physalia physalis</i>)." Ocean Science 17, no. 5 (2021): 1341–51. http://dx.doi.org/10.5194/os-17-1341-2021.

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Abstract. Physalia physalis, also called the bluebottle in Australia, is a colonial animal resembling a jellyfish that is well known to beachgoers for the painful stings delivered by its tentacles. Despite being a common occurrence, the origin of the bluebottle before reaching the coastline is not well understood, and neither is the way it drifts at the surface of the ocean. Previous studies used numerical models in combination with simple assumptions to calculate the drift of this species, excluding complex drifting dynamics. In this study, we provide a new parameterization for Lagrangian mod

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6

Poulain, Pierre-Marie, Luca Centurioni, and Tamay Özgökmen. "Comparing the Currents Measured by CARTHE, CODE and SVP Drifters as a Function of Wind and Wave Conditions in the Southwestern Mediterranean Sea." Sensors 22, no. 1 (2022): 353. http://dx.doi.org/10.3390/s22010353.

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Instruments drifting at the ocean surface are quasi-Lagrangian, that is, they do not follow exactly the near-surface ocean currents. The currents measured by three commonly-used drifters (CARTHE, CODE and SVP) are compared in a wide range of sea state conditions (winds up to 17 m/s and significant wave height up to 3 m). Nearly collocated and simultaneous drifter measurements in the southwestern Mediterranean reveal that the CARTHE and CODE drifters measure the currents in the first meter below the surface in approximately the same way. When compared to SVP drogued at 15 m nominal depth, the C

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7

Wang, Tianyu, Yan Du, and Minyang Wang. "Overlooked Current Estimation Biases Arising from the Lagrangian Argo Trajectory Derivation Method." Journal of Physical Oceanography 52, no. 1 (2022): 3–19. http://dx.doi.org/10.1175/jpo-d-20-0287.1.

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Abstract An Argo simulation system is used to provide synthetic Lagrangian trajectories based on the Estimating the Circulation and Climate of the Ocean Model, phase II (ECCO2). In combination with ambient Eulerian velocity at the reference layer (1000 m) from the model, quantitative metrics of the Lagrangian trajectory–derived velocities are computed. The result indicates that the biases induced by the derivation algorithm are strongly linked with ocean dynamics. In low latitudes, Ekman currents and vertically sheared geostrophic currents influence both the magnitude and the direction of the

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8

Ochoa, José, and Peter P. Niiler. "Vertical Vorticity Balance in Meanders Downstream the Agulhas Retroflection." Journal of Physical Oceanography 37, no. 6 (2007): 1740–44. http://dx.doi.org/10.1175/jpo3064.1.

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Abstract The Agulhas Current flows poleward along the western boundary of the southeastern Indian Ocean where, at the southernmost latitude of the African continent, it executes a dramatic anticyclonic turn, or retroflection, to the east. Since 1978, a large number of drifting buoys have passed through this eastward-flowing Agulhas Return Current (ARC), or the zonal frontal boundary between subtropical and subpolar waters of the south Indian Ocean. The spatial distribution of the ensemble-averaged near-surface velocity along the ARC axis reveals a series of steady-state meanders of 700-km wave

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9

Romero, Leonel, J. Carter Ohlmann, Enric Pallàs-Sanz, Nicholas M. Statom, Paula Pérez-Brunius, and Stéphane Maritorena. "Coincident Observations of Dye and Drifter Relative Dispersion over the Inner Shelf." Journal of Physical Oceanography 49, no. 9 (2019): 2447–68. http://dx.doi.org/10.1175/jpo-d-19-0056.1.

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AbstractCoincident Lagrangian observations of coastal circulation with surface drifters and dye tracer were collected to better understand small-scale physical processes controlling transport and dispersion over the inner shelf in the Gulf of Mexico. Patches of rhodamine dye and clusters of surface drifters at scales of O(100) m were deployed in a cross-shelf array within 12 km from the coast and tracked for up to 5 h with airborne and in situ observations. The airborne remote sensing system includes a hyperspectral sensor to track the evolution of dye patches and a lidar to measure directiona

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10

Pingree, R. D., and Linda Maddock. "Stokes, Euler and Lagrange Aspects of Residual Tidal Transports in the English Channel and the Southern Bight of the North Sea." Journal of the Marine Biological Association of the United Kingdom 65, no. 4 (1985): 969–82. http://dx.doi.org/10.1017/s0025315400019445.

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INTRODUCTIONThe dust cart on the Isles of Scilly did not end its service at the local tip, over the cliffs at Deep Point on the eastern side of St Mary's on 14 October 1983. Instead it floated off and continued in service as a Lagrangian drifter, indicating the residual transport of water around the islands. As a hazard to shipping its position was given out as a navigation warning and it was allegedly sighted on the western side of Scilly. The interesting oceanographic question is whether the dust cart was (or would have had it not sunk) circumnavigating the islands in a clockwise or anticloc

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11

Dhareshwar, L. J., P. A. Naik, T. C. Kaushik, and H. C. Pant. "Study of laser-driven shock wave propagation in Plexiglas targets." Laser and Particle Beams 10, no. 1 (1992): 201–11. http://dx.doi.org/10.1017/s0263034600004328.

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An experimental study of laser-driven shock wave propagation in a transparent material such as Plexiglas using a high-speed optical shadowgraphy technique is presented in this paper. A Nd:glass laser was used to produce laser intensity in the range 1012-1014 W/cm2 on the target. Optical shadowgrams of the propagating shock front were recorded with a second-harmonic (0.53-μm) optical probe beam. Shock pressures were measured at various laser intensities, and the scaling was found to agree with the theoretically predicted value. Shock pressure values have also been obtained from a one-dimensiona

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12

Duan, Lian, Meelan M. Choudhari, and Chao Zhang. "Pressure fluctuations induced by a hypersonic turbulent boundary layer." Journal of Fluid Mechanics 804 (September 13, 2016): 578–607. http://dx.doi.org/10.1017/jfm.2016.548.

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Direct numerical simulations (DNS) are used to examine the pressure fluctuations generated by a spatially developed Mach 5.86 turbulent boundary layer. The unsteady pressure field is analysed at multiple wall-normal locations, including those at the wall, within the boundary layer (including inner layer, the log layer, and the outer layer), and in the free stream. The statistical and structural variations of pressure fluctuations as a function of wall-normal distance are highlighted. Computational predictions for mean-velocity profiles and surface pressure spectrum are in good agreement with e

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13

Robinson, T. O., I. Eames, and R. Simons. "Dense gravity currents moving beneath progressive free-surface water waves." Journal of Fluid Mechanics 725 (May 23, 2013): 588–610. http://dx.doi.org/10.1017/jfm.2013.112.

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AbstractThe characteristics of dense gravity currents in coastal regions, where free-surface gravity waves are dominant, have yet to be studied in the laboratory. This paper provides a first insight into the dynamics of dense saline gravity currents moving beneath regular progressive free-surface water waves. The gravity currents were generated by releasing a finite volume of saline into a large wave tank with an established periodic wave field. After the initial collapse, the gravity currents propagated horizontally with two fronts, one propagating in the wave direction and the other against

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14

Lund, Björn, Brian K. Haus, Jochen Horstmann, et al. "Near-Surface Current Mapping by Shipboard Marine X-Band Radar: A Validation." Journal of Atmospheric and Oceanic Technology 35, no. 5 (2018): 1077–90. http://dx.doi.org/10.1175/jtech-d-17-0154.1.

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AbstractThe Lagrangian Submesoscale Experiment (LASER) involved the deployment of ~1000 biodegradable GPS-tracked Consortium for Advanced Research on Transport of Hydrocarbon in the Environment (CARTHE) drifters to measure submesoscale upper-ocean currents and their potential impact on oil spills. The experiment was conducted from January to February 2016 in the Gulf of Mexico (GoM) near the mouth of the Mississippi River, an area characterized by strong submesoscale currents. A Helmholtz-Zentrum Geesthacht (HZG) marine X-band radar (MR) on board the R/V F. G. Walton Smith was used to locate f

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15

Jakobson, L., T. Vihma, E. Jakobson, T. Palo, A. Männik, and J. Jaagus. "Low-level jet characteristics over the Arctic Ocean in spring and summer." Atmospheric Chemistry and Physics Discussions 13, no. 1 (2013): 2125–53. http://dx.doi.org/10.5194/acpd-13-2125-2013.

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Abstract. Low-level jets (LLJ) are important for turbulence in the stably stratified atmospheric boundary layer, but their occurrence, properties, and generation mechanisms in the Arctic are not well known. We analysed LLJs over the central Arctic Ocean in spring and summer 2007 on the bases of data collected in the drifting ice station Tara. Instead of traditional radiosonde soundings, data from tethersonde soundings with a high vertical resolution were used. The Tara results showed a lower occurrence of LLJs (46%) than many previous studies over polar sea ice. Strong jet core winds contribut

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16

Novelli, Guillaume, Cédric M. Guigand, Charles Cousin, et al. "A Biodegradable Surface Drifter for Ocean Sampling on a Massive Scale." Journal of Atmospheric and Oceanic Technology 34, no. 11 (2017): 2509–32. http://dx.doi.org/10.1175/jtech-d-17-0055.1.

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AbstractTargeted observations of submesoscale currents are necessary to improve science’s understanding of oceanic mixing, but these dynamics occur at spatiotemporal scales that are currently challenging to detect. Prior studies have recently shown that the submesoscale surface velocity field can be measured by tracking hundreds of surface drifters released in tight arrays. This strategy requires drifter positioning to be accurate, frequent, and to last for several weeks. However, because of the large numbers involved, drifters must be low-cost, compact, easy to handle, and also made of materi

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17

Manral, Darshika, Laura Gómez‐Navarro, Michael C. Denes, et al. "Separation Timescales of Vertically Migrating Zooplankton and Other (a)Biotic Materials in the Benguela System." Journal of Geophysical Research: Oceans 130, no. 4 (2025). https://doi.org/10.1029/2024jc021701.

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AbstractPlankton, plastics, nutrients, and other materials in the ocean can exhibit different dispersion patterns depending on their individual transport properties. These dispersion patterns can provide information on the effective timescales of interaction between different types of materials in a highly dynamic ocean environment, such as the Benguela system in the southeast Atlantic Ocean. In this study, we compare the timescales and spatial distribution of separation for zooplankton performing Diel Vertical Migration (DVM) while drifting with currents to those of other materials: (a) posit

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18

Sigmund, A., D. B. Melo, J. Dujardin, K. Nishimura, and M. Lehning. "Parameterizing Snow Sublimation in Conditions of Drifting and Blowing Snow." Journal of Advances in Modeling Earth Systems 17, no. 5 (2025). https://doi.org/10.1029/2024ms004332.

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AbstractSnow transport favors strong sublimation and may therefore have an important effect on the surface mass balance of polar and high‐mountain regions. Recently, small‐scale models such as large‐eddy simulation (LES) with Lagrangian snow particles have improved the understanding of snow transport processes and revealed shortcomings in large‐scale models. This study leverages LES simulations to assess and improve current parameterizations of sublimation and snow transport. Measurements from the S17 site, East Antarctica, are used to define realistic model parameters and boundary conditions

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