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Acoustic Visualization of Patch Dynamics in Oceanic Ecosystems
Land ecosystem dynamics plankton
2015/8/17
Over the past 25 years, investigations of patch dynamics in terrestrial and intertidal ecosystems have thoroughly revised our concepts of the processes structuring many natural communities (Levin et a...
Long-Term Observations in Acoustics—The Ocean Acoustic Observatory Federation
Ocean Acoustic Observatory Federation Acoustics
2015/8/5
The Ocean Acoustic Observatory Federation (OAOF) includes several laboratories and universities: the Institute of Geophysics and Planetary Physics (IGPP) and the Marine Physical Laboratory (MPL) at th...
Shallow Water '06: A Joint Acoustic Propagation/Nonlinear Internal Wave Physics Experiment
Wave Joint Acoustic Propagation
2015/7/22
Since the end of the Cold War, the US Navy has had an increasing interest in continental shelves and slopes as operational areas. To work in such areas requires a good understanding of ocean acoustics...
An Overview of Fixed Passive Acoustic Observation Methods for Cetaceans
Cetaceans Acoustic Observation Methods
2015/7/22
Cetaceans are increasingly being included as top trophic-level predators in models of ecosystem dynamics (Baumgartner and Mate, 2003; Tynan, 2004; Redfern et al., 2006). Traditional visual survey meth...
Estimating Zooplankton Biomass Distribution in the Water Column Near the Endeavour Segment of Juan de Fuca Ridge Using Acoustic Backscatter and Concurrently Towed Nets
Estimating Zooplankton Biomass Water Column Near Endeavour Segment Juan de Fuca Ridge Acoustic Backscatter Concurrently Towed Nets
2015/7/14
Logistical challenges, time, and the cost of towed net surveys make it difficult to obtain estimates of secondary biomass and production in the open ocean outside the summer sampling season. Alternate...
Ocean Acoustic Waveguide Remote Sensing:Visualizing Life Around Seamounts
Ocean Acoustic Waveguide Remote Sensing Life Around Seamounts
2015/7/7
Collectively, seamounts form a significant biome the size of Europe with important but heavily depleted fisheries (see Box 12 on page 206 of this issue [Etnoyer et al., 2010]). Recently, large seamoun...
On the Acoustic Characteristics of a Gulf Stream Cyclonic Ring
Acoustic Characteristics Gulf Stream Cyclonic Ring
2009/4/2
The acoustic properties of a cyclonic Gulf Stream ring have been studied with field data and ray computations. Cyclonic rings represent relatively low sound velocity regions with large horizontal grad...
Classifying ships by their acoustic signals with a cross-bispectrum algorithm and a radial basis function neural network
acoustic vector signal cross-bispectrum feature extraction RBFNN ship classification
2011/9/9
An algorithm for estimating the cross-bispectrum of an acoustic vector signal was formulated. Composed features of sound pressure and acoustic vector signals are extracted by the proposed algorithm an...
Horizontal Deflection of Acoustic Paths by Mesoscale Eddies
Horizontal Deflection Acoustic Paths Mesoscale Eddies
2009/2/16
The horizontal angular deflection of a ray path through a circular eddy is roughly 2v, where v is the fractional variation in sound speed at the eddy center; v may reach 0.03 for intense Gulf Stream r...
Mesoscale Current Fields Observed with a Shipboard Profiling Acoustic Current Meter
Mesoscale Current Fields Acoustic Current Meter
2009/2/8
Measurements of the near-surface currents obtained with a shipboard profiling acoustic current meter during the POLYMODE Local Dynamics Experiment are discussed. The large-scale spatial structure of t...
Measurements of Gulf Stream Meandering and Evidence of Seasonal Thermocline Development Using Long-Range Acoustic Transmissions
Gulf Stream Meandering Seasonal Thermocline Development Long-Range Acoustic Transmissions
2009/2/6
Phase-coded signals with 60 rms resolution were transmitted twice weekly for several months from acoustic sources at 2000 m depth in the Sargasso Sea to three bottom-mounted receives designed as West,...
On the Determination of Kv in the Near-Surface Ocean from Acoustic Measurements of Bubbles
wind waves Acoustic Measurements Near-Surface Ocean
2009/1/20
When wind waves break in deep water, clouds of small bubbles are produced which are diffused downwards by turbulence. We describe here how the vertical diffusion coefficient Kv of the turbulence near ...
Gyre-Scale Acoustic Tomography：Modeling Simulations
Modeling Simulations Gyre-Scale Acoustic Tomography
2009/1/15
Ocean Acoustic Tomography was proposed by Munk and Wunsch as a method for making measurements of ocean variability over large areas. After the successful demonstration of the feasibility of the idea i...
A Planetary Wave Analysis Using the Acoustic and Conventional Arrays in the 1981 Ocean Tomography Experiment
Planetary Wave Analysis Conventional Arrays Ocean Tomography Experiment
2009/1/8
Using the maximum likelihood estimation method, quasi-geostrophic wave solutions are fitted to the observations of the 1981 Ocean Acoustic Tomography Experiment. The experiment occupied a 300 km squar...
A Study of Geostrophy in Tropical Pacific Ocean Currents during the NORPAX Tahiti Shuttle using a Shipboard Doppler Acoustic Current Profiler
Tropical Pacific Ocean Currents Geostrophy Shipboard Doppler Acoustic Current Profiler
2009/1/5
Continuous velocity measurements from a shipboard Doppler acoustic long on the NORPAX shuttle experiment in the central equatorial Pacific are presented. The time mean of these velocities shows the cl...