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Relevant bibliographies by topics / Wave flows; EOFs

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Academic literature on the topic 'Wave flows; EOFs'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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Journal articles on the topic "Wave flows; EOFs"

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Franzke, Christian, Daan Crommelin, Alexander Fischer, and Andrew J. Majda. "A Hidden Markov Model Perspective on Regimes and Metastability in Atmospheric Flows." Journal of Climate 21, no. 8 (2008): 1740–57. http://dx.doi.org/10.1175/2007jcli1751.1.

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Abstract In this study, data from three atmospheric models are analyzed to investigate the existence of atmospheric flow regimes despite nearly Gaussian statistics of the planetary waves in these models. A hierarchy of models is used, which describes the atmospheric circulation with increasing complexity. To systematically identify atmospheric regimes, the presence of metastable states in the data is searched for by fitting so-called hidden Markov models (HMMs) to the time series. A hidden Markov model is designed to describe the situation in which part of the information of the system is unkn

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Teng, Haiyan, and Grant Branstator. "A Zonal Wavenumber 3 Pattern of Northern Hemisphere Wintertime Planetary Wave Variability at High Latitudes." Journal of Climate 25, no. 19 (2012): 6756–69. http://dx.doi.org/10.1175/jcli-d-11-00664.1.

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Abstract A prominent pattern of variability of the Northern Hemisphere wintertime tropospheric planetary waves, referred to here as the Wave3 pattern, is identified from the NCEP–NCAR reanalysis. It is worthy of attention because its structure is similar to the linear trend pattern as well as the leading pattern of multidecadal variability of the planetary waves during the past half century. The Wave3 pattern is defined as the second empirical orthogonal function (EOF) of detrended December–February mean 300-hPa meridional wind V300 and denotes a zonal shift of the ridges and troughs of the cl

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Suwa, Yudai. "On the importance of the equation of state for the neutrino-driven supernova explosion mechanism." Proceedings of the International Astronomical Union 7, S279 (2011): 397–98. http://dx.doi.org/10.1017/s174392131201352x.

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AbstractWe present two-dimensional numerical simulations of core-collapse supernova including multi-energy neutrino radiative transfer. We aim to examine the influence of the equation of state (EOS) for the dense nuclear matter. We employ four sets of EOSs, namely, those by Lattimer and Swesty (LS) and Shen et al., which became standard EOSs in the core-collapse supernova community. We reconfirm that not every EOS produces an explosion in spherical symmetry, which is consistent with previous works. In two-dimensional simulations, we find that the structure of the accretion flow is significantl

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Dubos, Thomas, Philippe Drobinski, and Pierre Carlotti. "Turbulence Anisotropy Carried by Streaks in the Neutral Atmospheric Surface Layer." Journal of the Atmospheric Sciences 65, no. 8 (2008): 2631–45. http://dx.doi.org/10.1175/2007jas2333.1.

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Abstract The authors investigate the relationships between coherent structures and turbulence anisotropy in the neutral planetary boundary layer by means of empirical orthogonal function (EOF) analysis of large-eddy simulation (LES) data. The simulated flow contains near-surface transient streaks. The EOF analysis extracts the most energetic patterns from the velocity fluctuations based on their second-order spatial correlations. The scale and direction of streaks obtained from a level-by-level analysis of the LES flow field do correspond to that of the EOFs. It is found that two characteristi

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Hu, Feng, Leying Zhang, Qiao Liu, and Dorina Chyi. "Environmental Factors Controlling the Precipitation in California." Atmosphere 12, no. 8 (2021): 997. http://dx.doi.org/10.3390/atmos12080997.

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Using observational data covering 1948–2020, the environmental factors controlling the winter precipitation in California were investigated. Empirical orthogonal function (EOF) analysis was applied to identify the dominant climate regimes contributing to the precipitation. The first EOF mode described a consistent change, with 70.1% variance contribution, and the second mode exhibited a south–east dipole change, with 11.7% contribution. For EOF1, the relationship was positive between PC1(principal component) and SST (sea surface temperature) in the central Pacific Ocean, while it was negative

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Rennert, Kevin J., and John M. Wallace. "Cross-Frequency Coupling, Skewness, and Blocking in the Northern Hemisphere Winter Circulation." Journal of Climate 22, no. 21 (2009): 5650–66. http://dx.doi.org/10.1175/2009jcli2669.1.

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Abstract Variability in daily wintertime [December–February (DJF)] 500-hPa heights on low [L: &lt;(30 day)−1], intermediate [M: (6–30 day)−1], and high [H: &gt;(6 day)−1] frequencies is examined using 40-yr ECMWF Re-Analysis (ERA-40) data. Leading EOFs of L correspond to planetary-scale teleconnection patterns; those of M to retrograding, eastward-dispersing long waves oriented along great circle routes; and those of H to baroclinic waves in the climatological-mean storm tracks. In the Atlantic sector, EOF 1 of M appears to be embedded in EOF 1 of L. Cross-frequency coupling between L

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Dias, Juliana, and George N. Kiladis. "The Relationship between Equatorial Mixed Rossby–Gravity and Eastward Inertio-Gravity Waves. Part II." Journal of the Atmospheric Sciences 73, no. 5 (2016): 2147–63. http://dx.doi.org/10.1175/jas-d-15-0231.1.

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Abstract Space–time spectral analysis of tropical cloudiness data shows strong evidence that convectively coupled n = 0 mixed Rossby–gravity waves (MRGs) and eastward inertio-gravity waves (EIGs) occur primarily within the western/central Pacific Ocean. Spectral filtering also shows that MRG and EIG cloudiness patterns are antisymmetric with respect to the equator, and they propagate coherently toward the west and east, respectively, with periods between 3 and 5 days, in agreement with Matsuno’s linear shallow-water theory. In contrast to the spectral approach, in a companion paper it has been

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Evans, K. F., J. R. Wang, D. O'C Starr, et al. "Ice hydrometeor profile retrieval algorithm for high-frequency microwave radiometers: application to the CoSSIR instrument during TC4." Atmospheric Measurement Techniques 5, no. 9 (2012): 2277–306. http://dx.doi.org/10.5194/amt-5-2277-2012.

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Abstract. A Bayesian algorithm to retrieve profiles of cloud ice water content (IWC), ice particle size (Dme), and relative humidity from millimeter-wave/submillimeter-wave radiometers is presented. The first part of the algorithm prepares an a priori file with cumulative distribution functions (CDFs) and empirical orthogonal functions (EOFs) of profiles of temperature, relative humidity, three ice particle parameters (IWC, Dme, distribution width), and two liquid cloud parameters. The a priori CDFs and EOFs are derived from CloudSat radar reflectivity profiles and associated ECMWF temperature

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Evans, K. F., J. R. Wang, D. O'C Starr, et al. "Ice hydrometeor profile retrieval algorithm for high frequency microwave radiometers: application to the CoSSIR instrument during TC4." Atmospheric Measurement Techniques Discussions 5, no. 2 (2012): 3117–98. http://dx.doi.org/10.5194/amtd-5-3117-2012.

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Abstract. A Bayesian algorithm to retrieve profiles of cloud ice water content (IWC), ice particle size (Dme), and relative humidity from millimeter-wave/submillimeter-wave radiometers is presented. The first part of the algorithm prepares an a priori file with cumulative distribution functions (CDFs) and empirical orthogonal functions (EOFs) of profiles of temperature, relative humidity, three ice particle parameters (IWC, Dme, distribution width), and two liquid cloud parameters. The a priori CDFs and EOFs are derived from CloudSat radar reflectivity profiles and associated ECMWF temperature

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Lorenz, David J. "Understanding Midlatitude Jet Variability and Change Using Rossby Wave Chromatography: Wave–Mean Flow Interaction." Journal of the Atmospheric Sciences 71, no. 10 (2014): 3684–705. http://dx.doi.org/10.1175/jas-d-13-0201.1.

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Abstract Rossby wave chromatography (RWC) is implemented in a linearized barotropic model as a tool to understand the interaction between the midlatitude jet and the eddy momentum fluxes (uυ) in an idealized GCM. Given the background zonal-mean flow and the space–time structure of the baroclinic wave activity source, RWC calculates the space–time structure of the upper-tropospheric uυ. RWC allows a clean separation of the effects of phase speed changes and index of refraction changes (i.e., changes in background flow) on uυ. It is found that uυ reinforces imposed zonal-mean zonal wind (u) anom

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Dissertations / Theses on the topic "Wave flows; EOFs"

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Stephen, Adam Vercingetorix. "POD methods in baroclinic flows." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302401.

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Book chapters on the topic "Wave flows; EOFs"

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Thomson, Peter. "The Earth Splits, Water Rushes In." In Sacred Sea. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195170511.003.0010.

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Siberia is huge, but it isn’t greedy. Of all the colors in the universe’s paint box, it asks for only a few shades of green to have its massive portrait painted. The picture starts with a ragged band of soft sage, the treeless tundra of the Arctic and subarctic. Through the middle, a thick swath of deep emerald, the taiga forest that stretches from the Pacific to the Urals and beyond to Scandinavia. Finally, in the far lower left corner, a wedge of soft yellowish green, Siberia’s share of the fertile Eurasian steppe. From a distance, this rough canvas is a study in chlorophyll, with just a single, stark break in the color scheme—a thin blue crescent slicing through the lower middle of the emerald taiga. It’s almost as if the same gigantic hand that wielded the paintbrush then picked up a monstrous stiletto and in an impulsive Dadaist gesture cut a gigantic gash into the taut canvas, which pulled open and filled up with cobalt paint. And I suppose if you believed in such things, you could say that’s actually what’s happened here, that the hand was God’s and that after the earth was sliced open, the gash grew ever wider and filled up with more and more blue water. Earth’s surface has been torn apart here, and water has been flowing into the gash for eons. A lake is a simple thing, really—just a big hole in the ground filled with water. And our restless planet finds all kinds of ways to make them. The earth is constantly reshaping itself, through processes great and small—from the epochal smashing and tearing of crustal plates, to the periodic growth and recession of glaciers, to the daily flow of wind, water, and sediment. As long as water flows and the earth moves, lakes will continue to be born, grow, and die. Lakes can be formed in the buckling and cracking seams between the earth’s tectonic plates, as with the Great Lakes of East Africa. They can be formed in the wake of receding glaciers, which leave long grooves, moraines, and kettle holes.

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Conference papers on the topic "Wave flows; EOFs"

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Hansen, Thomas E., Mena E. Tawfik, and F. J. Diez. "Application of the Electroosmotic Effect for Thrust Generation." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22137.

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The present work focuses on demonstrating the capabilities of electro-osmotic pumps, EOPs, to generate thrust. EOPs have high power to volume ratio and operate on ionic aqueous solutions making them a good candidate for use as thrusters in miniature watercraft such as micro underwater gliders. Millimeter-size nano-porous membrane will be used to achieve milli-Newton thrust. Electro-osmotic pumps are operated under high electric fields to achieve highest thrust possible. A byproduct of high electric fields in EOPs is the generation of gas which is addressed by using bipolar rectangular wave pum

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Dias, Fre´de´ric, Denys Dutykh, and Jean-Michel Ghidaglia. "Simulation of Free Surface Compressible Flows via a Two Fluid Model." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57060.

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The purpose of this communication is to discuss the simulation of a free surface compressible flow between two fluids, typically air and water. We use a two fluid model with the same velocity, pressure and temperature for both phases. In such a numerical model, the free surface becomes a thin three dimensional zone. The present method has at least three advantages: (i) the free-surface treatment is completely implicit; (ii) it can naturally handle wave breaking and other topological changes in the flow; (iii) one can easily vary the Equation of States (EOS) of each fluid (in principle, one can

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Cevheri, Necmettin, and Minami Yoda. "Evanescent-Wave Particle Velocimetry Studies of Electrokinetically Driven Flows: Divalent Counterion Effects." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75274.

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Characterizing the mainly incompressible and laminar flows of aqueous electrolyte solutions through channels with an overall dimension of O(1–100 μm) is of interest in a variety of microfluidics applications. Solid surfaces such as the channel wall become (usually negatively) charged due to direct ionization or dissociation of surface groups, where the charge is typically characterized by the wall zeta-potential ζw. The surface in turn attracts mobile counterions from the fluid to form a (usually positively) charged screening, or electric double, layer (EDL). An external electric field can the

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Gunda, Naga Siva Kumar, Suman Chakraborty, and Sushanta Kumar Mitra. "The Study of Combined Electroosmotic and Pressure Driven Flow in Wavy Nanochannels." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39255.

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Solid surfaces of micro/nanochannels exhibit a certain degree of roughness that is incurred during fabrication and/or adsorption of macromolecules. The presence of such roughness changes the flow pattern in electroosmotic flows (EOF). The present study investigates the effect of surface waviness on combined EOF and pressure driven flow (PDF) of an electrolyte solution, in a nanochannel having charged walls. The surface profile of the top and bottom walls vary either in a varicose or in a sinuous mode. The problem is solved by using the Perturbation model, a modified linearized disturbance Navi

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Sadr, R., Z. Zheng, M. Yoda, and A. T. Conlisk. "An Experimental and Modeling Study of Electroosmotic Bulk and Near-Wall Flows in Two-Dimensional Micro- and Nanochannels." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42917.

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Electrokinetically driven flow of electrolyte solutions through micro- and nanochannels is of interest in microelectromechanical systems (MEMS) and nanotechnology applications. In this work, fully developed and steady electroosmotic flow (EOF) of dilute sodium tetraborate and sodium chloride aqueous solutions in a rectangular channel where the channel hight h is comparable to its width W is examined. EOF is also studied under conditions of electric double layer (EDL) overlap, or λ/h ∼ O(1), where λ is the Debye thickness, for very dilute solutions. The initial experimental data and model resul

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Koh, C. G., M. Luo, W. Bai, and M. Gao. "Simulation of Wave Impact With Compressible Air Entrainment Based on Consistent Particle Method." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41107.

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A numerical strategy for incompressible-compressible two-phase flows with large density difference is presented. The incompressible phase is modeled by the recently developed 2-phase Consistent Particle Method (2P-CPM) for incompressible flows. For the compressible phase, a thermodynamically-consistent compressible solver is developed by using the ideal gas equation of state (EOS). Since sound speed is not explicitly involved, this compressible solver can overcome the issues in the determination of numerical sound speed. In addition, the compressible solver can be integrated with the incompres

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Zhou, Qi, and Chiu-On Ng. "Dispersion due to Electroosmotic Flow Through a Circular Tube With Axial Step Changes of Zeta Potential and Hydrodynamic Slippage." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16468.

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The hydrodynamic dispersion of a neutral non-reacting solute due to steady electro-osmotic flow in a circular channel with longitudinal step changes of zeta potential and hydrodynamic slippage is analyzed in this study. The channel wall is periodically micro-patterned along the axial position with alternating slip-stick stripes of distinct zeta potentials. Existing studies on electrically driven hydrodynamic dispersion are based on flow subject to either the no-slip boundary condition on the capillary surface or the simplification of lubrication approximation. Taking wall slippage into account

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Ivanov, Leonid, Rafael Ramos, and Drew Gustafson. "Energetics and Kinematics of Inertial Oscillations in the Central Northern GOM." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31020-ms.

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Abstract Understanding the physics of generation, propagation, and dissipation of inertial currents is important from a variety of aspects. For the Gulf of Mexico, one such aspect is that these oscillations represent an uncertainty in the measurements and forecasting of the longer-period currents, such as those due to the Loop Current (LC) and meso-scale eddies. The Industry has a practice of applying an ‘uplift’ to estimates of current velocity to account for the effect of tidal and inertial currents in cases when observations or model estimates do not resolve the high-frequency current varia

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