Now showing items 321-330 of 995
Estimation of planetary wave parameters from the data of the 1981 ocean acoustic tomography experiment
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1985-08)
Using the maximum-likelihood estimation method and minimization techniques, quasi-geostrophic wave solutions were fitted to the observations of the 1981 Ocean Acoustic Tomography Experiment. The experiment occupied a ...
On the electromagnetic fields produced by marine frequency domain controlled sources
(John Wiley & Sons, 2009-10-14)
In recent years, marine controlled source electromagnetics (CSEM) has found increasing use in hydrocarbon exploration due to its ability to detect thin resistive zones beneath the seafloor. Although it must be recognized ...
Sparse channel estimation for multicarrier underwater acoustic communication : from subspace methods to compressed sensing
In this paper, we investigate various channel estimators that exploit channel sparsity in the time and/or Doppler domain for a multicarrier underwater acoustic system. We use a path-based channel model, where the channel ...
Area selection for diamonds using magnetotellurics : examples from southern Africa
Southern Africa, particularly the Kaapvaal Craton, is one of the world’s best natural laboratories for studying the lithospheric mantle given the wealth of xenolith and seismic data that exist for it. The Southern African ...
Examining the effects of mid ocean ridge topography on 3D marine magnetometric resistivity model responses
(Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2004-06)
Methods which measure seafloor resistivity are uniquely suited to studying hydrothermal circulation in the crust. The magnetometric resistivity (MMR) technique is a galvanic method which uses a bipole current source with ...
Ray-acoustic caustic formation and timing effects from ocean sound-speed relative curvature
(Acoustical Society of America, 1994-08)
Using deterministic ray-acoustic modeling of 1000-km propagation in the North Pacific, a depth-dependent parameter of ocean sound channels has been found to strongly influence geometrical ray propagation. This parameter ...
Laboratory observations of double-diffusive convection using high-frequency broadband acoustics
High-frequency broadband (200-300 kHz) acoustic scattering techniques have been used to observe the diffusive regime of double-diffusive convection in the laboratory. Pulse compression signal processing techniques allow ...
The seasonal nitrogen cycle in Wilkinson Basin, Gulf of Maine, as estimated by 1-D biological model optimization
The objective of this study was to fit a simple ecosystem model to climatological nitrogen cycle data in the Gulf of Maine, in order to calibrate the biological model for use in future 3-D modelling studies. First ...
Handbook of oceanographic engineering materials : volume I - metals and alloys
(Woods Hole Oceanographic Institution, 1972-12)
This handbook is intended to serve as an aid in materials selection to Oceanographic engineers and designers. As such it is intentionally limited to materials that may be used advantageously in the marine environment.
Eddy-driven pulses of respiration in the Sargasso Sea
An analysis of nine years of data from the NW subtropical Atlantic reveals that variability in heterotrophic processes associated with (sub)mesoscale features has a major impact on the balance between photosynthesis and ...