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Thursday, November 19, 2020 | History

3 edition of Internal wave contributions to ocean remote sensing by acoustic scintillation analysis found in the catalog.

Internal wave contributions to ocean remote sensing by acoustic scintillation analysis

Internal wave contributions to ocean remote sensing by acoustic scintillation analysis

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  • 2 Currently reading

Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, For sale by the National Technical Information Service in Boulder, Colo, Springfield, Va .
Written in English

    Subjects:
  • Turbulence.,
  • Internal waves.,
  • Ocean currents -- Measurement.,
  • Oceanography -- Remote sensing.

  • Edition Notes

    StatementRichard J. Lataitis.
    SeriesNOAA technical memorandum ERL WPL -- 209., NOAA technical memorandum ERL WPL -- 209.
    ContributionsWave Propagation Laboratory.
    The Physical Object
    FormatMicroform
    Paginationv, 53 p.
    Number of Pages53
    ID Numbers
    Open LibraryOL14683054M

    Biosketch. Dr. Tang research encompasses ocean bottom interacting acoustics, especially problems involving horizontal, as well as vertical, environmental variabilities; acoustic tomography of sediments; sediment conductivity; wave propagation in range-dependent waveguides; array processing; acoustic scattering by gas bubbles and man-made objects in sediments. Internal waves are gravity waves that oscillate within a fluid medium, rather than on its surface. To exist, the fluid must be stratified: the density must change (continuously or discontinuously) with depth/height due to changes, for example, in temperature and/or the density changes over a small vertical distance (as in the case of the thermocline in lakes and oceans or an. This paper evaluates marine X-band radar's capability to retrieve interior ocean properties from internal wave (IW) sea surface signatures. In particular, we study the link between the wave-induced backscatter intensity modulation and the IW amplitude as well as the surface velocity convergence (and divergence).


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Internal wave contributions to ocean remote sensing by acoustic scintillation analysis Download PDF EPUB FB2

Get this from a library. Internal wave contributions to ocean remote sensing by acoustic scintillation analysis. [R J Lataitis; Wave Propagation Laboratory.]. Remote sensing of ocean internal waves: an overview.

The oceans are density stratified because of vertical variations in temperature and salinity. Oceanic internal waves can form at the interface (pycnocline) between layers of different water density and propagate long distances along the pycnocline. Internal waves on continental shelves are important because they can attain large amplitudes and affect acoustic wave propagation.

Ocean acoustic tomography is a method for acoustic remote sensing of the ocean interior that takes advantage of the facts that the propagation of sound through the ocean is sensitive to quantities of oceanographic interest, such as temperature and water velocity, and that the ocean is nearly transparent to low-frequency sound so that signals can be transmitted over long distances.

Acoustic remote sensing of internal solitary waves and internal tides in the Strait of Gibraltar Article in The Journal of the Acoustical Society of America (2) August with 6 Reads. Internal waves on continental shelves are important because they can attain large amplitudes and affect acoustic wave propagation, submarine navigation, nutrient mixing in the euphotic zone.

A complex internal wave (IW) field is created by the strongly sheared current velocity regime and narrow channel with steep topographic gradients. 28 IWs contribute to the generation and distribution of turbulent mixing and mass transfer to coral reef communities along the Keys.

29 Sources of IW energy are the interaction of Internal wave contributions to ocean remote sensing by acoustic scintillation analysis book barotropic (surface) tide with the along-shelf topography and FC fluctuations.

13,26. Stochastic sound-speed fluctuations in the ocean, such as those caused by internal waves, result in a progressive randomisation of acoustic signals as they traverse the ocean environment.

This signal randomisation imposes a limit to the effectiveness of ocean acoustic remote sensing. KLEMAS, V., Remote sensing of ocean internal waves: an overview. The oceans are density stratified because of vertical variations in temperature and salinity.

Oceanic internal waves can form at the interface (pycnocline) between layers of different water density and propagate long distances along the pycnocline. Internal waves on continental shelves are important because they.

Space‐time acoustic scintillation analysis has proved to be a valuable technique for probing ocean flows over short (≲2 km) acoustic paths. Measurements of the amplitude and phase perturbations in a distant receiving plane are used to infer the intervening fine‐scale variability and transverse current.

Observations made using one transmitter and two receivers yield path‐integrated. D.M. Farmer and S.F. Clifford, “Space-time acoustic scintillation analysis: A new technique for probing ocean flows”, IEEE Journal of Oceanic Engineering, OE, 42–50, CrossRef Google Scholar. At this step one may remark that acoustic remote sensing of the MABL and some ocean surface properties (surface roughness, wind, precipitation) is mature and a lot of progress has been made.

Einaudi and O. Zeman. An analysis of wave-turbulence interaction. Journal of Atm. Science, 39, –, Acoustic remote sensing of. To compound the problem, various ocean processes, including internal waves and small-scale turbulence, introduce small fluctuations in the sound speed, which are responsible for significant acoustic fluctuations over long transmission paths.

The complicated scintillation pattern observed when an acoustic wave propagates through refractive index irregularities is due to the “projection” of all the refractive eddies at each path position onto the receiving plane. A current transverse to the acoustic path will advect the eddies and produce a drift in the scintillation pattern.

A single transmitter and two receivers can be used to. interaction, remote sensing science, shallow-water acoustics, and coastal mixed-layer dynamics.

Reports of what are almost certainly surface manifestations of oceanic internal solitary waves are centuries, if not millennia old, but their scientific study is more recent.

The oceans cover 70% of the Earth’s surface, and are critical components of Earth’s climate system. This new edition of Encyclopedia of Ocean Sciences summarizes the breadth of knowledge about them, providing revised, up to date entries as well coverage of new topics in the field.

New and expanded sections include microbial ecology, high latitude systems and the cryosphere, climate and. Ocean acoustic remote sensing using ambient noise: results from the Florida Straits ambient noise cross-correlation analysis and seismic coda cross-correlation analysis.

In an underwater acoustic context, it is necessary to isolate the contributions to those wave fields from individual modal pulses. To achieve that goal, we make use of. Entropy and scintillation analysis of acoustical beam waves imposes the ultimate limitations on large-scale ocean acoustic remote sensing and matched-field processing.

Fur- ~Munk. and, the internal wave contribution is modeled using the Garrett–Munk spectrum which has been described. This book is intended as a handbook for professionals and researchers in the areas of Physical Oceanography, Ocean and Coastal Engineering and as a text for graduate students in these fields.

It presents a comprehensive study on surface ocean waves induced by wind, including basic mathematical principles, physical description of the observed phenomena, practical forecasting techniques of. AI-based remote sensing ALGORITHM development (sea surface temperature, ocean color, wind, wave, dynamic topography, sea ice, etc.) AI-based ocean and marine meteorology FORECAST (sea surface temperature, storm, etc.) We would like to invite articles on ocean-related studies using state-of-the-art AI techniques.

Lataitis has written: 'Internal wave contributions to ocean remote sensing by acoustic scintillation analysis' -- subject(s): Oceanography, Ocean currents, Remote sensing, Turbulence. To reduce the floor space of receiving antenna arrays, the Radio Ocean Remote SEnsing (RORSE) laboratory of Wuhan University developed a circular receiving array for a multi-frequency high frequency (MHF) radar system inconsisting of seven uniformly spaced antenna elements positioned on a circle with a diameter of 5 m.

Remote Sensing of Ocean Internal Waves: An Overview. [1] Internal waves affect many important dynamical processes in the ocean, but in situ observations of internal waves are infrequent and spatially sparse.

Here we show that remote sensing of internal waves by marine seismic reflection methods can provide quantitative information on internal wave energy and its spatial variability at high lateral resolution and full ocean depth over large.

Remote sensing techniques are capable of detecting the sea surface roughness caused by oceanic internal waves, which can then be applied to analyze the dynamics of internal waves in a wide range of ocean area.

Due to its characteristics of relatively all weather capability, we are able to observe the appearance of oceanic internal waves. BOX 11 | Ocean Acoustic Waveguide Remote Sensing: Visualizing Life Around Seamounts By Nicholas C.

Makris, Srinivasan Jagannathan, and Anamaria Ignisca Collectively, seamounts form a significant biome the size of Europe with important but heavily depleted fisheries (see Box 12 on page of this issue [Etnoyer et al., ]). Recently. contains contributions from all ocean wave components longer than the Bragg waves, and the second-order part of the power spectrum can be inverted to estimate the frequency-direction spectrum of the longer waves 26 and the magnitude and directions of near-surface winds via a wind-wave.

Abstract: Oceanographers and remote sensing researchers have long recognized the potential of using satellite imagery for studying oceanic internal waves. Radars are able to image internal waves because they are particularly sensitive to changes in the small-scale surface roughness (i.e.

the capillary and ultragravity waves) present on the ocean surface which are altered by the velocity field. Completed various theoretical studies related to the propagation and scatter of acoustic and electromagnetic waves from atmospheric turbulence, and acoustic waves from oceanic turbulence and internal waves, and the ocean surface, as applied to the remote sensing of winds, currents, turbulence intensity, sea-state, etc.

Ocean exploration, undersea remote sensing of marine life and geophysical phenomena, wave propagation and scattering theory in remote sensing through random media and waveguides, statistical estimation and information theory in sensing, linear and nonlinear acoustics and.

The study of physical and electrodynamics' properties of the gravity wave breaking processes and the foam spatio-temporal activity is an important facet of satellite oceanography, ocean engineering, air-sea interaction and ocean remote sensing.

In particular, the contribution of foam formations of various types to the mean and the spatio. The relation between ocean internal waves (IWs) and surface fluctuation is studied using a quasi-incompressible two-dimensional linear ocean wave model.

The main conclusions are as follows: the IW parameters can be obtained by solving the boundary value problem of ordinary differential equations with the frequency, wave number, and amplitude of. Morozov A.K., Colosi J.A Stochastic differential equation analysis for ocean acoustic energy scattering by internal waves, Lecture 21 August - Nansen Environmental and Remote Sensing Center.

Morozov A.K., Preisig J.C., Papp J., Investigation of Modal Processing for Low Frequency Acoustic Communications in Shallow Water.

It provides full explanations of radiative transfer, ocean surface properties, satellite orbits, instruments and methods, visible remote sensing of biogeochemical properties, infrared and microwave retrieval of sea surface temperature, sea surface salinity retrieval, passive microwave measurements, scatterometer wind retrieval, altimetry and SAR.

The scintillation index (SI) of the sound intensity is simulated to estimate the change of the effect of internal wave activity on acoustic field showing that the SI decreases to a half after the typhoons passage.

The normal mode structures of the two experiments are also significantly different due to the thermocline changes.

The theory has also been adapted to include both internal wave and. valuable for the planning of ocean acoustic activities associated with remote sensing, communications, or navigation. Oceanographic observations in the Arctic will help provide new insight into the. Specializing in the remote sensing of the world's oceans Major GOA Projects An Atlas of Internal Solitary-like Waves 32 case studies on oceanic internal waves around the world: sponsored by the Office of Naval Research Code PO Global Ocean Associates was founded in by Dr.

John R. Apel the "father" of SEASAT - the first SAR ocean. The ocean is opaque to electromagnetic radiation and transparent to low frequency sound, so acoustical methodologies are an important tool for sensing the undersea world. Stochastic sound-speed fluctuations in the ocean, such as those caused by internal waves, result in a progressive randomisation of acoustic signals as they traverse the ocean.

The authors hope this book will be an indispensable part of students, researchers, and academics libraries on underwater acoustics. Development of a means to predict acoustic propagation regimes is extremely valuable for the planning of ocean acoustic activities associated with remote sensing, communications, or navigation.

TRANSITIONS. Marine information technology (MarineIT) involves marine information gathering, transmission, processing, and fusion. Traditionally, this topic has been referred to in the context of acoustic, optical, and electromagnetic sensing of the ocean environment, most notably sonar/radar processing and satellite remote sensing.

The oceans cover 70% of the Earth's surface, and are critical components of Earth's climate system. This new edition of Encyclopedia of Ocean Sciences summarizes the breadth of knowledge about them, providing revised, up to date entries as well coverage of new topics in the field.

Henyey, F.S., J.A. Mercer, R.K. Andrew, and A.W. White, "A Method to Determine Small-Scale Internal Wave and Spice Fields from a Single CTD Profile with Application to Three Long-Range Ocean Acoustics Experiments," Technical Memorandum, APL-UW TMApplied Physics Laboratory, University of Washington, Seattle, 59 pp.

The various prediction methods, currently used in oceanography and ocean engineering, are described and the examples of practical calculations illustrate the basic appendix provides a description of the modern methods of wave measurement, including the remote sensing techniques.

Also the wave simulation methods and random data analysis.de Szoeke S. P., C. W. Fairall, D. Wolfe, L. Bariteau and P. Zuidema (August ): Surface Flux Observations on the Southeastern Tropical Pacific Ocean and Attribution of SST Errors in Coupled Ocean-Atmosphere Models.