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Journal articles on the topic 'Roll fronts'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Aizhulov, Daniar, Madina Tungatarova, and Aidarkhan Kaltayev. "Streamlines Based Stochastic Methods and Reactive Transport Simulation Applied to Resource Estimation of Roll-Front Uranium Deposits Exploited by In-Situ Leaching." Minerals 12, no. 10 (2022): 1209. http://dx.doi.org/10.3390/min12101209.

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Roll-front uranium deposits are ore mineralizations that occur in sandstones or arkoses downstream from redox fronts or reduced/oxidized geochemical barriers. They are often bounded above and below by impermeable shaly/muddy layers making them ideal for in-situ leaching exploitation. Several stochastic simulations were previously investigated either to characterize the ore grade distribution within roll-front type deposits, or for describing geological processes involved in their formation. This work suggests some modifications/improvements of conventional geostatistical algorithms for honorin

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2

Walter, Fabian, Zhen Zhang, Jordan Aaron, Brian McArdell, and Christoph Graf. "Seismic Measurements of Roll Waves in Debris Flows." E3S Web of Conferences 415 (2023): 03031. http://dx.doi.org/10.1051/e3sconf/202341503031.

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Accurate debris-flow modelling depends on the ability to simulate surging and pulsing behaviour. However, our understanding of these phenomena is starved of observational constraints. Here we propose the use of seismic measurements, which resolve the arrival of coarse-grained roll wave fronts in debris flows at Illgraben, Switzerland. Roll waves likely play a key role in flow pulses but are typically only observed with point measurements like depth gauges. We compare in-torrent force plate measurements with near-torrent seismic records and discuss how these data can test existing roll wave the

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3

HIGGINS, P. "FOSSILS TO FERTILIZER: TAPHONOMIC IMPLICATIONS OF URANIUM ROLL FRONTS." PALAIOS 22, no. 5 (2007): 577–82. http://dx.doi.org/10.2110/palo.2005.p05-140r.

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4

Ng, Chiu-On, and Chiang C. Mei. "Roll waves on a shallow layer of mud modelled as a power-law fluid." Journal of Fluid Mechanics 263 (March 25, 1994): 151–84. http://dx.doi.org/10.1017/s0022112094004064.

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We give a theory of permanent roll waves on a shallow layer of fluid mud which is modelled as a power-law fluid. Based on the long-wave approximation, Kármán's momentum integral method is applied to derive the averaged continuity and the momentum equations. Linearized instability analysis of a uniform flow shows that the growth rate of unstable disturbances increases monotonically with the wavenumber, and therefore is insufficient to suggest a preferred wavelength for the roll wave. Nonlinear roll waves are obtained next as periodic shocks connected by smooth profiles with depth increasing mon

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DOELMAN, ARJEN, BJÖRN SANDSTEDE, ARND SCHEEL, and GUIDO SCHNEIDER. "Propagation of hexagonal patterns near onset." European Journal of Applied Mathematics 14, no. 1 (2003): 85–110. http://dx.doi.org/10.1017/s095679250200503x.

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For a pattern-forming system with two unbounded spatial directions that is near the onset to instability, we prove the existence of modulated fronts that connect (i) stable hexagons with the unstable trivial pattern, (ii) stable hexagons with unstable roll solutions, (iii) stable hexagons with unstable hexagons, and (iv) stable roll solutions with unstable hexagons. Our approach is based on spatial dynamics, bifurcation theory, and geometric singular perturbation theory.

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6

Schmidt, Christoph W., and Robert A. Goler. "Nonlinear Waves ahead of Fronts in the Great Australian Bight." Monthly Weather Review 138, no. 9 (2010): 3474–97. http://dx.doi.org/10.1175/2010mwr3232.1.

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Abstract This study investigates nonlinear waves ahead of cold fronts in the Great Australian Bight, south of the Australian continent. These waves often form a series of roll clouds on their crests analogous to the “morning glory,” which is observed around the Gulf of Carpentaria in northeastern Australia. High-resolution visible satellite imagery from NASA’s polar-orbiting Aqua and Terra satellites between 23 October 2004 and 29 February 2008 is used to determine how frequently these cloud lines occur ahead of cold fronts. A total of 14 cases are identified with the most cases occurring in s

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Skyllingstad, Eric D., and Roger M. Samelson. "Instability Processes in Simulated Finite-Width Ocean Fronts." Journal of Physical Oceanography 50, no. 9 (2020): 2781–96. http://dx.doi.org/10.1175/jpo-d-20-0030.1.

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AbstractA simple, isolated front is modeled using a turbulence resolving, large-eddy simulation (LES) to examine the generation of instabilities and inertial oscillations by surface fluxes. Both surface cooling and surface wind stress are considered. Coherent roll instabilities with 200–300-m horizontal scale form rapidly within the front after the onset of surface forcing. With weak surface cooling and no wind, the roll axis aligns with the front, yielding results that are equivalent to previous constant gradient symmetric instability cases. After ~1 day, the symmetric modes transform into ba

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8

Carver, Steve, Dave Sear, and Eric Valentine. "An Observation of roll waves in a supraglacial meltwater channel, Harlech Gletscher, East Greenland." Journal of Glaciology 40, no. 134 (1994): 75–78. http://dx.doi.org/10.3189/s0022143000003816.

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AbstractObservations of pulsating flow conditions in a supraglacier meltwater channel on Harlech Gletscher, East Greenland, are reported. Waves of water with turbulent wave fronts and smooth recessive limbs were observed passing downstream at regular intervals of 6-7 s. Peak channel discharge was estimated at 0.5-1.0 m3 s−1, in between which discharge was zero. It is suggested that the phenomenon as observed was due to the formation of roll waves in response to channel morphology and prevalent discharge conditions. Measurements of channel morphology are given together with calculations of crit

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Carver, Steve, Dave Sear, and Eric Valentine. "An Observation of roll waves in a supraglacial meltwater channel, Harlech Gletscher, East Greenland." Journal of Glaciology 40, no. 134 (1994): 75–78. http://dx.doi.org/10.1017/s0022143000003816.

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Abstract Observations of pulsating flow conditions in a supraglacier meltwater channel on Harlech Gletscher, East Greenland, are reported. Waves of water with turbulent wave fronts and smooth recessive limbs were observed passing downstream at regular intervals of 6-7 s. Peak channel discharge was estimated at 0.5-1.0 m3 s−1, in between which discharge was zero. It is suggested that the phenomenon as observed was due to the formation of roll waves in response to channel morphology and prevalent discharge conditions. Measurements of channel morphology are given together with calculations of cri

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10

Hamayotsu, Kikue, and Ronnie Nataatmadja. "Indonesia in 2015." Asian Survey 56, no. 1 (2016): 129–37. http://dx.doi.org/10.1525/as.2016.56.1.129.

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The new Indonesian president, Joko Widodo (“Jokowi”), has faced formidable challenges on a number of fronts in his first year in office. Although Jokowi has managed to roll out his pet projects for the poor, management of competing partisan and personal interests as well as the economy and religious conflict continues to be a challenge. Overall, the new government’s contribution to democratic reforms has been modest thus far.

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Robertson, Alexander. "The centroid of tree crowns as an indicator of abiotic processes in a balsam fir wave forest." Canadian Journal of Forest Research 17, no. 7 (1987): 746–55. http://dx.doi.org/10.1139/x87-119.

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Wave forests are rare and were previously known only in high altitude Abiesbalsamea forests in northeastern U.S.A. and in subalpine A. veitchii – A. mariesii forests in Japan. Wave forests have been discovered at several locations in Newfoundland, including a very large and unique wave forest extending over 100–150 km2 on the coastal plain of northwestern Newfoundland. The wave fronts, characterized by dead tree strips, are mostly sinusoidal with an axis aligned in the direction of the prevailing wind, are spaced 100–150 m apart, and move in 55-year cycles. Crest-shaped wave fronts are concave

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Seilacher, Adolf, Cynthia Marshall, H. Catherine W. Skinner, and Takanobu Tsuihiji. "A fresh look at sideritic “coprolites”." Paleobiology 27, no. 1 (2001): 7–13. http://dx.doi.org/10.1666/0094-8373(2001)027<0007:aflasc>2.0.co;2.

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Sideritic “coprolites” from the late Miocene of southwest Washington, the Upper Cretaceous of Saskatchewan and Madagascar, and the Permian of China have often been claimed to be pseudofossils. They are here interpreted as intestinal casts (cololites) prefossilized by bacterial activity and later transformed into siderite with no traces of original food particles left. All occurrences are found within fluvial overbank deposits that carry no other vertebrate remains. Their absence could be due to aquifer roll-fronts that destroyed phosphatic bones and teeth but favored siderite precipitation.

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Capet, X., J. C. McWilliams, M. J. Molemaker, and A. F. Shchepetkin. "Mesoscale to Submesoscale Transition in the California Current System. Part I: Flow Structure, Eddy Flux, and Observational Tests." Journal of Physical Oceanography 38, no. 1 (2008): 29–43. http://dx.doi.org/10.1175/2007jpo3671.1.

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Abstract In computational simulations of an idealized subtropical eastern boundary upwelling current system, similar to the California Current, a submesoscale transition occurs in the eddy variability as the horizontal grid scale is reduced to O(1) km. This first paper (in a series of three) describes the transition in terms of the emergent flow structure and the associated time-averaged eddy fluxes. In addition to the mesoscale eddies that arise from a primary instability of the alongshore, wind-driven currents, significant energy is transferred into submesoscale fronts and vortices in the up

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KUSKE, R., and P. MILEWSKI. "Modulated two-dimensional patterns in reaction–diffusion systems." European Journal of Applied Mathematics 10, no. 2 (1999): 157–84. http://dx.doi.org/10.1017/s095679259800360x.

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New modulation equations for hexagonal patterns in reaction–diffusion systems are derived for parameter régimes corresponding to the onset of patterns. These systems include additional nonlinearities which are not present in Rayleigh–Bénard convection or Swift–Hohenberg type models. The dynamics of hexagonal and roll patterns are studied using a combination of analytical and computational approaches which exploit the hexagonal structure of the modulation equations. The investigation demonstrates instabilities and new phenomena not found in other systems, and is applied to patterns of flame fro

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Schertel, Lukas, Sofia Magkiriadou, Pavel Yazhgur, and Ahmet Demirörs. "Manufacturing Large-scale Materials with Structural Color." CHIMIA 76, no. 10 (2022): 833. http://dx.doi.org/10.2533/chimia.2022.833.

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Living organisms frequently use structural color for coloration as an alternative mechanism to chemical pigmentation. Recently there has been a growing interest to translate structural color into synthetic materials as a more durable and less hazardous alternative to conventional pigments. Efforts to fabricate structurally colored materials take place in different fronts, from 3D printing to spray-coating and roll-to-roll casting. Stability, performance, and quality of the color, the environmental impact of the materials or their manufacturing methods are some of the heavily researched topics

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Viroulet, S., J. L. Baker, F. M. Rocha, C. G. Johnson, B. P. Kokelaar, and J. M. N. T. Gray. "The kinematics of bidisperse granular roll waves." Journal of Fluid Mechanics 848 (June 13, 2018): 836–75. http://dx.doi.org/10.1017/jfm.2018.348.

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Small perturbations to a steady uniform granular chute flow can grow as the material moves downslope and develop into a series of surface waves that travel faster than the bulk flow. This roll wave instability has important implications for the mitigation of hazards due to geophysical mass flows, such as snow avalanches, debris flows and landslides, because the resulting waves tend to merge and become much deeper and more destructive than the uniform flow from which they form. Natural flows are usually highly polydisperse and their dynamics is significantly complicated by the particle size seg

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Wang, Chen, Justin E. Stopa, Doug Vandemark, et al. "A multi‐tagged SAR ocean image dataset identifying atmospheric boundary layer structure in winter tradewind conditions." Geoscience Data Journal 12, no. 1 (2024): 1–14. https://doi.org/10.1002/gdj3.282.

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AbstractA dataset of multi‐tagged sea surface roughness synthetic aperture radar (SAR) satellite images was established near Barbados from January to June 2016 to 2019. It is an advancement of the Sentinel‐1 Wave Mode TenGeoP‐SARwv (a labelled SAR imagery dataset of 10 geophysical phenomena from Sentinel‐1 wave mode) dataset that targets SAR marine atmospheric boundary layer (MABL) coherent structures. Twelve tags define roll vortices, convective cells, mixed rolls and convective cells, fronts, rain cells, cold pools and low winds. Examples are provided for each signature. The final dataset is

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18

SHOR, BORIS, and NOLAN McCARTY. "The Ideological Mapping of American Legislatures." American Political Science Review 105, no. 3 (2011): 530–51. http://dx.doi.org/10.1017/s0003055411000153.

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The development and elaboration of the spatial theory of voting has contributed greatly to the study of legislative decision making and elections. Statistical models that estimate the spatial locations of individual decision-makers have made a key contribution to this success. Spatial models have been estimated for the U.S. Congress, the Supreme Court, U.S. presidents, a large number of non-U.S. legislatures, and supranational organizations. Yet one potentially fruitful laboratory for testing spatial theories, the individual U.S. states, has remained relatively unexploited, for two reasons. Fi

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19

Rallakis, Dimitrios, Raymond Michels, Marc Brouand, Olivier Parize, and Michel Cathelineau. "The Role of Organic Matter on Uranium Precipitation in Zoovch Ovoo, Mongolia." Minerals 9, no. 5 (2019): 310. http://dx.doi.org/10.3390/min9050310.

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The Zoovch Ovoo uranium deposit is located in East Gobi Basin in Mongolia. It is hosted in the Sainshand Formation, a Late Cretaceous siliciclastic reservoir, in the lower part of the post-rift infilling of the Mesozoic East Gobi Basin. The Sainshand Formation corresponds to poorly consolidated medium-grained sandy intervals and clay layers deposited in fluvial-lacustrine settings. The uranium deposit is confined within a 60- to 80-m-thick siliciclastic reservoir inside aquifer driven systems, assimilated to roll-fronts. As assessed by vitrinite reflectance (%Rr < 0.4) and molecular geochem

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20

Flageat, Manon, Bryan Lim, and Antoine Cully. "Beyond Expected Return: Accounting for Policy Reproducibility When Evaluating Reinforcement Learning Algorithms." Proceedings of the AAAI Conference on Artificial Intelligence 38, no. 11 (2024): 12024–32. http://dx.doi.org/10.1609/aaai.v38i11.29090.

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Many applications in Reinforcement Learning (RL) usually have noise or stochasticity present in the environment. Beyond their impact on learning, these uncertainties lead the exact same policy to perform differently, i.e. yield different return, from one roll-out to another. Common evaluation procedures in RL summarise the consequent return distributions using solely the expected return, which does not account for the spread of the distribution. Our work defines this spread as the policy reproducibility: the ability of a policy to obtain similar performance when rolled out many times, a crucia

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Shakespeare, Callum J. "Curved Density Fronts: Cyclogeostrophic Adjustment and Frontogenesis." Journal of Physical Oceanography 46, no. 10 (2016): 3193–207. http://dx.doi.org/10.1175/jpo-d-16-0137.1.

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AbstractCurvature can play a significant role in the dynamics of density fronts at small scales and in low-latitude regions of the ocean. Fronts can be displaced from balance by rapid forcing and undergo an adjustment toward a more stable state or be strained and sharpened by surrounding flow in a process known as frontogenesis. This study investigates the role of curvature in adjustment and frontogenesis using the idealized configuration of an axisymmetric eddy and associated circular front. As a result of the curvature, the balanced state of this system is not geostrophic balance, where pres

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Shabaga, Brandi M., Mostafa Fayek, David Quirt, Charlie W. Jefferson, and Alfredo Camacho. "Mineralogy, geochronology, and genesis of the Andrew Lake uranium deposit, Thelon Basin, Nunavut, Canada." Canadian Journal of Earth Sciences 54, no. 8 (2017): 850–68. http://dx.doi.org/10.1139/cjes-2017-0024.

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The Thelon Basin located in Nunavut, Canada, shares many similarities with the U-producing Athabasca Basin in Saskatchewan. The Kiggavik project area, located near the northeastern edge of the Thelon Basin, contains U deposits and showings along the ∼30 km long NE–SW Kiggavik – Andrew Lake structural trend. The Andrew Lake deposit is near the southern end of this trend. Pre-mineralization is characterized by quartz ± carbonate veins that occupy fault systems later reactivated as conduits for U-mineralizing fluids. A four-phase genetic model is proposed for the Andrew Lake deposit. Phase 1 comp

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Biard, James C., and Kenneth E. Kunkel. "Automated detection of weather fronts using a deep learning neural network." Advances in Statistical Climatology, Meteorology and Oceanography 5, no. 2 (2019): 147–60. http://dx.doi.org/10.5194/ascmo-5-147-2019.

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Abstract. Deep learning (DL) methods were used to develop an algorithm to automatically detect weather fronts in fields of atmospheric surface variables. An algorithm (DL-FRONT) for the automatic detection of fronts was developed by training a two-dimensional convolutional neural network (2-D CNN) with 5 years (2003–2007) of manually analyzed fronts and surface fields of five atmospheric variables: temperature, specific humidity, mean sea level pressure, and the two components of the wind vector. An analysis of the period 2008–2015 indicates that DL-FRONT detects nearly 90 % of the manually an

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Schemm, Sebastian, Michael Sprenger, and Heini Wernli. "When during Their Life Cycle Are Extratropical Cyclones Attended by Fronts?" Bulletin of the American Meteorological Society 99, no. 1 (2018): 149–65. http://dx.doi.org/10.1175/bams-d-16-0261.1.

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Abstract For nearly a century, the study of atmospheric dynamics in the midlatitudes has presented dichotomic perspectives on one of its focal points: the birth and life cycle of cyclones. In particular, the role of fronts has driven much of the historical discourse on cyclogenesis. In the 1910s–20s, the Bergen School of Meteorology postulated that cyclogenesis occurs on a preexisting front. This concept was later replaced by the baroclinic instability paradigm, which describes the development of a surface front as a consequence of the growing cyclone rather than its cause. However, there is a

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Cao, Yuhan, Chunyan Li, and Changming Dong. "Atmospheric Cold Front-Generated Waves in the Coastal Louisiana." Journal of Marine Science and Engineering 8, no. 11 (2020): 900. http://dx.doi.org/10.3390/jmse8110900.

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Atmospheric cold front-generated waves play an important role in the air–sea interaction and coastal water and sediment transports. In-situ observations from two offshore stations are used to investigate variations of directional waves in the coastal Louisiana. Hourly time series of significant wave height and peak wave period are examined for data from 2004, except for the summer time between May and August, when cold fronts are infrequent and weak. The intra-seasonal scale variations in the wavefield are significantly affected by the atmospheric cold frontal events. The wave fields and direc

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Wang, Xiong Liang, and Chun Ling Wang. "Extraction of Ocean Fronts Based on Empirical Mode Decomposition." Applied Mechanics and Materials 701-702 (December 2014): 303–7. http://dx.doi.org/10.4028/www.scientific.net/amm.701-702.303.

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Ocean front is a narrow transitional zone that the penetration of sea is obviously different between two or more waters there. It is an important feature of geophysical turbulence which plays an important role in ocean dynamics. Ocean fronts become visible on radar images because they are associated with a variable surface current which modulates the sea surface roughness and thus the backscattered radar power. This paper propose a new integrated method to extract ocean fronts based on two-dimensional Empirical Mode Decomposition (EMD), image edge detection and mathematical morphology processi

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Marchais, T., B. Pérot, C. Carasco, et al. "The use of self-induced X-ray fluorescence in gamma-ray spectroscopy of uranium ore samples." EPJ Web of Conferences 225 (2020): 05003. http://dx.doi.org/10.1051/epjconf/202022505003.

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Gamma logging for uranium exploration are currently based on total counting with Geiger Müller gas detectors or NaI (TI) scintillators. However, the total count rate interpretation in terms of uranium concentration may be impaired in case of roll fronts, when the radioactive equilibrium of the natural 238U radioactive chain is modified by differential leaching of uranium and its daughter radioisotopes of thorium, radium, radon, etc. Indeed, in case of secular equilibrium, more than 95 % of gamma rays emitted by uranium ores come from 214Pb and 214Bi isotopes, which are in the back-end of 238U

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Curtarelli, M. P., E. H. Alcântara, C. D. Rennó, and J. L. Stech. "Modeling the effects of cold front passages on the heat fluxes and thermal structure of a tropical hydroelectric reservoir." Hydrology and Earth System Sciences Discussions 10, no. 7 (2013): 8467–502. http://dx.doi.org/10.5194/hessd-10-8467-2013.

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Abstract. We study the influence of cold fronts on the heat fluxes and thermal structure of a tropical reservoir located in Brazil. The period chosen for this study consisted of 49 days between 28 April 2010 and 15 July 2010 and was defined based on information from the Brazilian Centre for Weather Forecasting and Climate Studies (CPTEC), data collected in situ and the interpretation of remotely sensed images. During the selected time period, five cold front passages were identified, allowing us to analyze the cumulative effect of cold fronts and the reservoir's resilience on the days that ela

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Cordone, Angelina, Matteo Selci, Bernardo Barosa, et al. "Surface Bacterioplankton Community Structure Crossing the Antarctic Circumpolar Current Fronts." Microorganisms 11, no. 3 (2023): 702. http://dx.doi.org/10.3390/microorganisms11030702.

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The Antarctic Circumpolar Current (ACC) is the major current in the Southern Ocean, isolating the warm stratified subtropical waters from the more homogeneous cold polar waters. The ACC flows from west to east around Antarctica and generates an overturning circulation by fostering deep-cold water upwelling and the formation of new water masses, thus affecting the Earth’s heat balance and the global distribution of carbon. The ACC is characterized by several water mass boundaries or fronts, known as the Subtropical Front (STF), Subantarctic Front (SAF), Polar Front (PF), and South Antarctic Cir

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Possanza, D. Mark. "Cornua and Frontes in [Tibullus] 3.1.13." Classical Quarterly 44, no. 1 (1994): 281–82. http://dx.doi.org/10.1017/s0009838800017407.

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The transmitted text of line 13, ‘inter geminas…frontes’, has long presented an anomaly in the description of the decorated papyrus roll. If, in the context of book production, frons means the flat, round cross section located at either end of the rolled up book (TLL 6.1.1362, 84) and if cornu means an ornamental projection attached to the ends of the umbilicus and extending beyond the plane of the frons, then the transmitted text is a physical impossibility. For it is the frontes that lie between the cornua and not the other way round. In the words of Heyne's paraphrase: ‘geminae frontes inte

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Zhang, Hao-Ran, Yi Yu, Zhibin Gao, et al. "Seasonal and Interannual Variability of Fronts and Their Impact on Chlorophyll-a in the Indonesian Seas." Journal of Physical Oceanography 53, no. 12 (2023): 2847–59. http://dx.doi.org/10.1175/jpo-d-23-0041.1.

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Abstract The spatiotemporal variability of oceanic fronts in the Indonesian seas was investigated using high-resolution satellite observations. The study aimed to understand the underlying mechanism driving these fronts and their impact on chlorophyll-a variability. A high value of frontal probability was found near the coasts of major islands, exhibiting a distinct seasonal cycle with peaks occurrences during austral winter. The distribution variability of chlorophyll-a was generally consistent with the presence of active frontal zones, although a significantly positive relationship between f

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Schultz, David M. "Comments on “Unusually Long Duration, Multiple-Doppler Radar Observations of a Front in a Convective Boundary Layer”." Monthly Weather Review 135, no. 12 (2007): 4237–39. http://dx.doi.org/10.1175/2007mwr2189.1.

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Abstract Stonitsch and Markowski perform multiple-Doppler radar analyses of a cold front over Oklahoma and Kansas. Despite their interesting results, their explanations include a number of misconceptions about cold fronts. These misconceptions include the proper interpretation of the frontogenesis function, the role of entrainment versus differential surface sensible heat flux toward weakening the virtual potential temperature gradient across a cold front, a separation of the wind shift from the virtual potential temperature gradient, and the factors that affect the motion of the cold front.

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Qin, Yujing, Qian Liu, and Chuhan Lu. "Cold Front Identification Using the DETR Model with Satellite Cloud Imagery." Remote Sensing 17, no. 1 (2024): 36. https://doi.org/10.3390/rs17010036.

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The cloud system characteristics within satellite cloud imagery play a crucial role in the meteorological operational analysis of cold fronts, and integrating satellite cloud imagery into automated frontal identification schemes can provide valuable insights for accurately determining the position and morphology of cold fronts. This study introduces Cloud-DETR, a deep learning identification method that uses the DETR model with satellite cloud imagery, to identify cold fronts from extensive datasets. In the Cloud-DETR method, preprocessed satellite cloud imagery is used to generate training im

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Li, Ke, Zhexuan Zhang, Greg Chini, and Glenn Flierl. "Langmuir Circulation: An Agent for Vertical Restratification?" Journal of Physical Oceanography 42, no. 11 (2012): 1945–58. http://dx.doi.org/10.1175/jpo-d-11-0225.1.

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Abstract Comparably little is known about the impact of down-front-propagating surface waves on the stability of submesoscale lateral fronts in the ocean surface mixed layer. In this investigation, the stability of lateral fronts in gradient–wind balance to two-dimensional (down-front invariant) disturbances is analyzed using the stratified, rotating Craik–Leibovich (CL) equations. Through the action of the CL vortex force, the surface waves fundamentally alter the superinertial, two-dimensional linear stability of these fronts, with the classical symmetric instability mode being replaced by a

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Ogawa, Fumiaki, and Thomas Spengler. "Influence of mid-latitude sea surface temperature fronts on the atmospheric water cycle and storm track activity." Weather and Climate Dynamics 5, no. 3 (2024): 1031–42. http://dx.doi.org/10.5194/wcd-5-1031-2024.

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Abstract. The climatological mean enhancement of the turbulent air–sea heat exchange along mid-latitude sea surface temperature (SST) fronts that anchor mid-latitude storm tracks suggests its crucial role in the atmospheric water cycle and storm tracks through the intensification of atmospheric cyclones and their associated precipitation. We investigate the sensitivity of the atmospheric water cycle to the SST front through a set of aqua-planet experiments. Varying the latitude of a zonally symmetric mid-latitude SST front, the mid-latitude atmospheric water cycle responds through distinct cha

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Deremble, Bruno, Guillaume Lapeyre, and Michael Ghil. "Atmospheric Dynamics Triggered by an Oceanic SST Front in a Moist Quasigeostrophic Model." Journal of the Atmospheric Sciences 69, no. 5 (2012): 1617–32. http://dx.doi.org/10.1175/jas-d-11-0288.1.

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Abstract To understand the atmospheric response to a midlatitude oceanic front, this paper uses a quasigeostrophic (QG) model with moist processes. A well-known, three-level QG model on the sphere has been modified to include such processes in an aquaplanet setting. Its response is analyzed in terms of the upper-level atmospheric jet for sea surface temperature (SST) fronts of different profiles and located at different latitudes. When the SST front is sufficiently strong, it tends to anchor the mean atmospheric jet, suggesting that the jet’s spatial location and pattern are mainly affected by

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CASSARO, P., F. SCHILLIRÓ, V. COSTA, G. BELVEDERE, R. A. ZAPPALÁ, and G. LANZAFAME. "THE ENGINE OF OUTFLOWS IN AGN: THE ROLE OF PHYSICAL TURBULENT VISCOSITY." International Journal of Modern Physics D 17, no. 09 (2008): 1635–40. http://dx.doi.org/10.1142/s0218271808013248.

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Adopting the smoothed particle hydrodynamics (SPH) numerical method, we performed a grid of evolving models of a 3D, axially symmetric, physically viscous accretion disc around a black hole (BH) in an AGN. In such disc models, the role of the specific angular momentum λ and of the physical turbulent viscosity parameter α, according to the Shakura and Sunyaev prescription, are examined. One or two shock fronts develop in the radial inviscid flow, according to the assigned initial kinematic and thermodynamic conditions. Couples of (α, λ) values determine radial periodical oscillations in the sho

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Messager, C., S. Speich, and E. Key. "Marine atmospheric boundary layer over some Southern Ocean fronts during the IPY BGH 2008 cruise." Ocean Science 8, no. 6 (2012): 1001–23. http://dx.doi.org/10.5194/os-8-1001-2012.

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Abstract. A set of meteorological instruments was added to an oceanographic cruise crossing the Southern Ocean from Cape Town to 57°33' S during the summer of 2008. The Cape Cauldron, the Subtropical, Subantarctic, Polar and southern Antarctic Circumpolar current fronts were successively crossed. The recorded data permitted to derive the exchange of momentum, heat and water vapour at the ocean-atmosphere interface. A set of 38 radiosonde releases complemented the dataset. The marine atmospheric boundary layer characteristics and air-sea interaction when the ship crossed the fronts and eddies a

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Ostroumova, S. A., I. D. Drozd, and D. I. Frey. "Structure and Temporal Variability of the Northern Branch of the Antarctic Circumpolar Current in the Drake Passage." Океанология 63, no. 4 (2023): 511–25. http://dx.doi.org/10.31857/s0030157423040160.

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The Antarctic Circumpolar Current plays the key role in the circulation of the Southern Ocean and affects the distribution of heat by the ocean on the global scale. The study of the dynamics and structure of this current becomes especially important in a changing climate. The current is well revealed by satellite altimetry data, which makes possible to study temporal and spatial variability of its structure at different scales. In these studies, the methods for determining the position of individual fronts of the Antarctic Circumpolar Current based on satellite altimetry data become especially

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Wang, Y. L., J. Raeder, and C. T. Russell. "Plasma depletion layer: the role of the slow mode waves." Annales Geophysicae 22, no. 12 (2004): 4259–72. http://dx.doi.org/10.5194/angeo-22-4259-2004.

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Abstract. The plasma depletion layer (PDL) is a layer on the sunward side of the magnetopause with lower plasma density and higher magnetic field compared to their corresponding values in the upstream magnetosheath. The depletion layer usually occurs during northward (IMF) conditions with low magnetic shear across the magnetopause. We have previously validated the Raeder global model by comparing the computed formation of a magnetosheath density depletion with in-situ observations. We also have performed a detailed force analysis and found the varying roles that different MHD forces play along

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Wenegrat, Jacob O., Leif N. Thomas, Miles A. Sundermeyer, et al. "Enhanced mixing across the gyre boundary at the Gulf Stream front." Proceedings of the National Academy of Sciences 117, no. 30 (2020): 17607–14. http://dx.doi.org/10.1073/pnas.2005558117.

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The Gulf Stream front separates the North Atlantic subtropical and subpolar ocean gyres, water masses with distinct physical and biogeochemical properties. Exchange across the front is believed to be necessary to balance the freshwater budget of the subtropical gyre and to support the biological productivity of the region; however, the physical mechanisms responsible have been the subject of long-standing debate. Here, the evolution of a passive dye released within the north wall of the Gulf Stream provides direct observational evidence of enhanced mixing across the Gulf Stream front. Numerica

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Cremaschini, Claudio, and Massimo Tessarotto. "The Wave-Front Equation of Gravitational Signals in Classical General Relativity." Symmetry 12, no. 2 (2020): 216. http://dx.doi.org/10.3390/sym12020216.

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In this paper the dynamical equation for propagating wave-fronts of gravitational signals in classical general relativity (GR) is determined. The work relies on the manifestly-covariant Hamilton and Hamilton–Jacobi theories underlying the Einstein field equations recently discovered (Cremaschini and Tessarotto, 2015–2019). The Hamilton–Jacobi equation obtained in this way yields a wave-front description of gravitational field dynamics. It is shown that on a suitable subset of configuration space the latter equation reduces to a Klein–Gordon type equation associated with a 4-scalar field which

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Wang, Tao, Roy Barkan, James C. McWilliams, and M. Jeroen Molemaker. "Structure of Submesoscale Fronts of the Mississippi River Plume." Journal of Physical Oceanography 51, no. 4 (2021): 1113–31. http://dx.doi.org/10.1175/jpo-d-20-0191.1.

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AbstractSubmesoscale currents (SMCs), in the forms of fronts, filaments, and vortices, are studied using a high-resolution (~150 m) Regional Oceanic Modeling System (ROMS) simulation in the Mississippi River plume system. Fronts and filaments are identified by large horizontal velocity and buoyancy gradients, surface convergence, and cyclonic vertical vorticity with along-coast fronts and along-plume-edge filaments notably evident. Frontogenesis and arrest/destruction are two fundamental phases in the life cycle of fronts and filaments. In the Mississippi River plume region, the horizontal adv

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Hopkins, Jo, Peter Challenor, and Andrew G. P. Shaw. "A New Statistical Modeling Approach to Ocean Front Detection from SST Satellite Images." Journal of Atmospheric and Oceanic Technology 27, no. 1 (2010): 173–91. http://dx.doi.org/10.1175/2009jtecho684.1.

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Abstract Ocean fronts are narrow zones of intense dynamic activity that play an important role in global ocean–atmosphere interactions. Owing to their highly variable nature, both in space and time, they are notoriously difficult features to adequately sample using traditional in situ techniques. In this paper, the authors propose a new statistical modeling approach for detecting and monitoring ocean fronts from Advanced Very High Resolution Radiometer (AVHRR) SST satellite images that builds on a previous “front following” algorithm. Weighted local likelihood is used to provide a smooth, nonp

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Papritz, Lukas, Stephan Pfahl, Irina Rudeva, Ian Simmonds, Harald Sodemann, and Heini Wernli. "The Role of Extratropical Cyclones and Fronts for Southern Ocean Freshwater Fluxes." Journal of Climate 27, no. 16 (2014): 6205–24. http://dx.doi.org/10.1175/jcli-d-13-00409.1.

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Abstract In this study, the important role of extratropical cyclones and fronts for the atmospheric freshwater flux over the Southern Ocean is analyzed. Based on the Interim ECMWF Re-Analysis (ERA-Interim), the freshwater flux associated with cyclones is quantified and it is revealed that the structure of the Southern Hemispheric storm track is strongly imprinted on the climatological freshwater flux. In particular, during austral winter the spiraliform shape of the storm track leads to a band of negative freshwater flux bending toward and around Antarctica, complemented by a strong freshwater

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Han, Wenhu, Wenjun Kong, Yang Gao, and Chung K. Law. "The role of global curvature on the structure and propagation of weakly unstable cylindrical detonations." Journal of Fluid Mechanics 813 (January 19, 2017): 458–81. http://dx.doi.org/10.1017/jfm.2016.873.

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The role of the global curvature on the structure and propagation of cylindrical detonations is studied allowing and without allowing the development of cellular structures through two-dimensional (2-D) and 1-D simulations, respectively. It is shown that as the detonation transitions from being overdriven to the Chapman–Jouguet (CJ) state, its structure evolves from no cell, to growing cells and then to diverging cells. Furthermore, the increased dimension of the average structure of the cellular cylindrical detonation, coupled with the curved transverse wave, leads to bulk un-reacted pockets

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Rohe, K., and J. Cisternas. "Propagation failure in discrete reaction–diffusion system based on the butterfly bifurcation." Chaos: An Interdisciplinary Journal of Nonlinear Science 32, no. 5 (2022): 053124. http://dx.doi.org/10.1063/5.0086239.

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Reaction–diffusion systems are used in biology, chemistry, and physics to model the interaction of spatially distributed species. Particularly of interest is the spatial replacement of one equilibrium state by another, depicted as traveling waves or fronts. Their profiles and traveling velocity depend on the nonlinearities in the reaction term and on spatial diffusion. If the reaction occurs at regularly spaced points, the velocities also depend on lattice structures and the orientation of the traveling front. Interestingly, there is a wide region of parameters where the speeds become zero and

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Qiu, Bo, Shuiming Chen, and Niklas Schneider. "Dynamical Links between the Decadal Variability of the Oyashio and Kuroshio Extensions." Journal of Climate 30, no. 23 (2017): 9591–605. http://dx.doi.org/10.1175/jcli-d-17-0397.1.

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Rather than a single and continuous boundary current outflow, long-term satellite observations reveal that the Oyashio Extension (OE) in the North Pacific Subarctic Gyre comprises two independent, northeast–southwest-slanted front systems. With a mean latitude along 40°N, the western OE front exists primarily west of 153°E and is a continuation of the subarctic gyre western boundary current. The eastern OE front, also appearing along 40°N, is located between 153° and 170°E, whose entity is disconnected from its western counterpart. During 1982–2016, both of the OE fronts exhibit prominent deca

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Heilman, Warren E., Kenneth L. Clark, Xindi Bian, et al. "Turbulent Momentum Flux Behavior above a Fire Front in an Open-Canopied Forest." Atmosphere 12, no. 8 (2021): 956. http://dx.doi.org/10.3390/atmos12080956.

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Atmospheric turbulent circulations in the vicinity of wildland fire fronts play an important role in the transfer of momentum into and out of combustion zones, which in turn can potentially affect the behavior and spread of wildland fires. The vertical turbulent transfer of momentum is accomplished via individual sweep, ejection, outward interaction, and inward interaction events, collectively known as sweep-ejection dynamics. This study examined the sweep-ejection dynamics that occurred before, during, and after the passage of a surface fire front during a prescribed fire experiment conducted

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Commins, Morgan L., Isabelle Ansorge, and Peter G. Ryan. "Multi-scale factors influencing seabird assemblages in the African sector of the Southern Ocean." Antarctic Science 26, no. 1 (2013): 38–48. http://dx.doi.org/10.1017/s0954102013000138.

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AbstractOceanic fronts are important foraging areas for many top predators, but they also define biogeographical boundaries to animals in the Southern Ocean and play a role in structuring seabird assemblages. Understanding the factors driving patterns in the spatial and temporal distribution of seabirds is important to infer the likely impact of a changing climate. Latitudinal transects south of Africa in two summers indicate that fronts and sea ice extent play key roles in determining seabird assemblages. We observed 37 seabird taxa and found five seabird assemblages. The Subtropical Converge

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