The global frequency-wavenumber spectrum of oceanic variability estimated from TOPEX/POSEIDON altimetric measurements

1995 ◽  
Vol 100 (C12) ◽  
pp. 24895 ◽  
Author(s):  
Carl Wunsch ◽  
Detlef Stammer
Keyword(s):  
Wavenumber Spectrum ◽  
Altimetric Measurements ◽  
Oceanic Variability

The effect of the toroidal wavenumber spectrum on the high energy tail formation during ICRH

1997 ◽  
Vol 37 (6) ◽  
pp. 719-723 ◽  
Author(s):  
J Carlsson ◽  
L.-G Eriksson ◽  
T Hellsten
Keyword(s):  
High Energy ◽  
High Energy Tail ◽  
Wavenumber Spectrum

scholarly journals Estimating Geostrophic Shear from Seismic Images of Oceanic Structure*

2011 ◽  
Vol 28 (9) ◽  
pp. 1149-1154 ◽  
Author(s):  
Katy L. Sheen ◽  
Nicky White ◽  
C. P. Caulfield ◽  
Richard W. Hobbs
Keyword(s):  
Horizontal Resolution ◽  
Vertical Shear ◽  
Spatial And Temporal Variation ◽  
Seismic Profiles ◽  
Data Volume ◽  
Circumpolar Current ◽  
Altimetric Measurements ◽  
Seismic Reflections ◽  
Geostrophic Velocities ◽  
Seismic Images

Abstract It is shown that geostrophic vertical shear estimates can be recovered from seismic (i.e., acoustic) images of thermohaline structure. In the Southern Ocean, the Antarctic Circumpolar Current forms a loop within the Falkland Trough before it flows northward into the Argentine Basin. Seismic profiles that cross this loop show the detailed structure of different water masses with a horizontal resolution of O(10 m). Coherent seismic reflections are tilted in response to current flow around the Falkland Trough. Average slopes were measured on length scales that are large enough to ensure that the geostrophic approximation is valid (i.e., with a Rossby number <0.1). By combining shear estimates with satellite altimetric measurements and acoustic Doppler current profiles, geostrophic velocities can be calculated throughout the data volume. This technique for estimating geostrophic vertical shear from legacy seismic images yields useful information about the spatial and temporal variation of mesoscale circulation.

Low-frequency internal oceanic variability under seasonal forcing

1992 ◽  
Vol 97 (C6) ◽  
pp. 9541 ◽  
Author(s):  
Paul G. Myers ◽  
Andrew J. Weaver
Keyword(s):  
Low Frequency ◽  
Oceanic Variability

An Algorithm of Turbulence Wavenumber Spectrum Matching Based on SVM

2013 ◽  
Vol 850-851 ◽  
pp. 880-883
Author(s):  
Yong Fang Wang ◽  
Xin Luan ◽  
Da Lei Song ◽  
Li Ping Chen
Keyword(s):  
Cross Validation ◽  
Learning Algorithm ◽  
Trial Data ◽  
Observation Data ◽  
Matching Accuracy ◽  
Sea Trial ◽  
Optimum Parameters ◽  
Category Labels ◽  
Wavenumber Spectrum ◽  
Spectrum Matching

Considering the problem of invalid data caused mismatch of wavenumber spectrum which contained in turbulence observation data, an algorithm of turbulent wavenumber spectrum matching based on SVM is proposed. Category labels are obtained from pre-processed raw data by cross validation algorithm, and then the optimum parameters of the classifier are got through SVM learning algorithm. Sea trial data validation results indicate that the algorithm has high matching accuracy, and provides a new way to calculate the turbulence wavenumber spectrum matching.

scholarly journals Nonlinear features of equatorial baroclinic Rossby waves detected in Topex altimeter observations

1996 ◽  
Vol 3 (2) ◽  
pp. 115-126 ◽  
Author(s):  
R. E. Glazman ◽  
A. Fabrikant ◽  
A. M. Greysukh
Keyword(s):  
Rossby Waves ◽  
Propagation Speed ◽  
Altimeter Data ◽  
Satellite Altimeter ◽  
Wave Regime ◽  
Nonlinear Features ◽  
Wavenumber Spectrum ◽  
Satellite Altimeter Data ◽  
Rule Out

Abstract. Using a recently proposed technique for statistical analysis of non-gridded satellite altimeter data, regime of long equatorially-trapped baroclinic Rossby waves is studied. One-dimensional spatial and spatiotemporal autocorrelation functions of sea surface height (SSH) variations yield a broad spectrum of baroclinic Rossby waves and permit determination of their propagation speed. The 1-d wavenumber spectrum of zonal variations is given by a power-law k-2 on scales from about 103 km to 104 km. We demonstrate that the observed wave regime exhibits features of soliton turbulence developing in the long baroclinic Rossby waves. However, being limited to second statistical moments, the present analysis does not allow us to rule out a possibility of weak wave turbulence.

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