John A. Colosi
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View article: Transmission loss of surface-reflected ray arrivals underneath seasonally varying sea ice in the Canada Basin during 2016–2017
Transmission loss of surface-reflected ray arrivals underneath seasonally varying sea ice in the Canada Basin during 2016–2017 Open
During the 2016–2017 Canada Basin Acoustic Propagation Experiment, an ocean acoustic tomography array with a radius of 150 km measured the impulse responses of the ocean every 4 hr at a variety of ranges and bearings using broadband signal…
View article: A juvenile journey: Using a highly resolved 3D mooring array to investigate the roles of wind and internal tide forcing in across‐shore larval transport
A juvenile journey: Using a highly resolved 3D mooring array to investigate the roles of wind and internal tide forcing in across‐shore larval transport Open
The across‐shore transport of meroplanktonic larvae is predominantly driven by coastal physical processes, resulting in episodic recruitment of benthic species. Historically, due to the sampling challenges associated with resolving these a…
View article: Near-Inertial Energy Variability in a Strong Mesoscale Eddy Field in the Iceland Basin
Near-Inertial Energy Variability in a Strong Mesoscale Eddy Field in the Iceland Basin Open
An 18-month deployment of moored sensors in Iceland Basin allows characterization of near-inertial (frequencies near the Coriolis frequency f with periods of ~14 h) internal gravity wave generation and propagation in a region with an activ…
View article: Nutricline adjustment by internal tidal beam generation enhances primary production in idealized numerical models
Nutricline adjustment by internal tidal beam generation enhances primary production in idealized numerical models Open
When the barotropic tide encounters variable bathymetry, fluctuating flow along a topographic slope generates baroclinic tides, or internal tides. There is growing evidence that these internal tides can affect primary production in the eup…
View article: Using long-range transmissions in the Beaufort Gyre to test the sound-speed equation at high pressure and low temperature
Using long-range transmissions in the Beaufort Gyre to test the sound-speed equation at high pressure and low temperature Open
An ocean acoustic tomography array with a radius of 150 km was deployed in the central Beaufort Gyre during 2016–2017 for the Canada Basin Acoustic Propagation Experiment. Five 250-Hz transceivers were deployed in a pentagon, with a sixth …
View article: Acoustic travel-time variability observed on a 150-km radius tomographic array in the Canada Basin during 2016–2017
Acoustic travel-time variability observed on a 150-km radius tomographic array in the Canada Basin during 2016–2017 Open
The Arctic Ocean is undergoing dramatic changes in response to increasing atmospheric concentrations of greenhouse gases. The 2016–2017 Canada Basin Acoustic Propagation Experiment was conducted to assess the effects of the changes in the …
View article: Observations of the space/time scales of Beaufort sea acoustic duct variability and their impact on transmission loss via the mode interaction parameter
Observations of the space/time scales of Beaufort sea acoustic duct variability and their impact on transmission loss via the mode interaction parameter Open
The Beaufort duct (BD) is a subsurface sound channel in the western Arctic Ocean formed by cold Pacific Winter Water (PWW) sandwiched between warmer Pacific Summer Water (PSW) and Atlantic Water (AW). Sound waves can be trapped in this duc…
View article: Observations of sound-speed fluctuations in the Beaufort Sea from summer 2016 to summer 2017
Observations of sound-speed fluctuations in the Beaufort Sea from summer 2016 to summer 2017 Open
Due to seasonal ice cover, acoustics can provide a unique means for Arctic undersea communication, navigation, and remote sensing. This study seeks to quantify the annual cycle of the thermohaline structure in the Beaufort Sea and characte…
View article: Sensitivity of mixed layer duct propagation to deterministic ocean features
Sensitivity of mixed layer duct propagation to deterministic ocean features Open
Here, the problem of mode coupling in a mixed layer (ML) surface duct is considered where the coupling is induced by deterministic upper ocean features such as eddies, filaments, and/or density compensated temperature and salinity anomalie…
View article: Automated Detection, Classification, and Tracking of Internal Wave Signatures Using X-Band Radar in the Inner Shelf
Automated Detection, Classification, and Tracking of Internal Wave Signatures Using X-Band Radar in the Inner Shelf Open
A method based on machine learning and image processing techniques has been developed to track the surface expression of internal waves in near–real time. X-band radar scans are first preprocessed and averaged to suppress surface wave clut…
View article: The Inner-Shelf Dynamics Experiment
The Inner-Shelf Dynamics Experiment Open
The inner shelf, the transition zone between the surfzone and the midshelf, is a dynamically complex region with the evolution of circulation and stratification driven by multiple physical processes. Cross-shelf exchange through the inner …
View article: A seminal paper linking ocean acoustics and physical oceanography
A seminal paper linking ocean acoustics and physical oceanography Open
The Reflections series takes a look back on historical articles from The Journal of the Acoustical Society of America that have had a significant impact on the science and practice of acoustics.
View article: Acoustical News
Acoustical News Open
Editor's Note: Readers of this journal are encouraged to submit news items on awards, appointments, and other activities about themselves or their colleagues. Deadline dates for news and notices are 2 months prior to publication.
View article: Observations of upper ocean sound-speed structures in the North Pacific and their effects on long-range acoustic propagation at low and mid-frequencies
Observations of upper ocean sound-speed structures in the North Pacific and their effects on long-range acoustic propagation at low and mid-frequencies Open
Three 1000-km long, high resolution conductivity, temperature, depth sections in the North Pacific Ocean obtained by the ship towed vehicle SeaSoar are analyzed to quantify 2005 March/April upper-ocean sound-speed structure and determine t…
View article: Temporal and spatial dependence of a yearlong record of sound propagation from the Canada Basin to the Chukchi Shelf
Temporal and spatial dependence of a yearlong record of sound propagation from the Canada Basin to the Chukchi Shelf Open
The Pacific Arctic Region has experienced decadal changes in atmospheric conditions, seasonal sea-ice coverage, and thermohaline structure that have consequences for underwater sound propagation. To better understand Arctic acoustics, a se…
View article: Alongshore Variability of Shoaling Internal Bores on the Inner Shelf
Alongshore Variability of Shoaling Internal Bores on the Inner Shelf Open
Temperature and velocity measurements from 42 moorings were used to investigate the alongshore variability of nonlinear internal bores as they propagated across the central California inner shelf. Moorings were deployed September–October 2…
View article: Heating of the Midshelf and Inner Shelf by Warm Internal Tidal Bores
Heating of the Midshelf and Inner Shelf by Warm Internal Tidal Bores Open
Cross-shore heat flux (CHF) spatiotemporal variability in the subtidal (ST), diurnal (DU), and semidiurnal (SD) bands is described for 35 days (summer 2015) from collocated vertical measures of temperature and currents obtained by moorings…
View article: Turbulence Asymmetries in Bottom Boundary Layer Velocity Pulses Associated with Onshore-Propagating Nonlinear Internal Waves
Turbulence Asymmetries in Bottom Boundary Layer Velocity Pulses Associated with Onshore-Propagating Nonlinear Internal Waves Open
The inner shelf is a region inshore of that part of the shelf that roughly obeys Ekman dynamics and offshore of the surf zone. Importantly, this is where surface and bottom boundary layers are in close proximity, overlap, and interact. The…
View article: Observations of Shoaling Nonlinear Internal Bores across the Central California Inner Shelf
Observations of Shoaling Nonlinear Internal Bores across the Central California Inner Shelf Open
We present observations of shoaling nonlinear internal bores off the coast of central California. The dataset includes 15 moorings deployed during September–October 2017 and cross-shore shipboard surveys. We describe the cross-shore struct…
View article: Observations of phase and intensity fluctuations for low-frequency, long-range transmissions in the Philippine Sea and comparisons to path-integral theory
Observations of phase and intensity fluctuations for low-frequency, long-range transmissions in the Philippine Sea and comparisons to path-integral theory Open
In the Philippine Sea, from April 2010 to March 2011, a 330-km radius pentagonal acoustic transceiver array with a sixth transceiver in the center transmitted broadband signals with center frequencies between 172 and 275 Hz and 100 Hz band…
View article: Untangling a Web of Interactions Where Surf Meets Coastal Ocean
Untangling a Web of Interactions Where Surf Meets Coastal Ocean Open
In 2017, an ocean research team launched an unprecedented effort to understand what drives ocean currents in the overlap regions between surf zones and continental shelves.
View article: Cross-Shore Observations Of Warm, Internal Tide Bores Within The Nearshore
Cross-Shore Observations Of Warm, Internal Tide Bores Within The Nearshore Open
Temperature and current observations near Pt. Sal, CA.
View article: Cross-Shore Observations Of Warm, Internal Tide Bores Within The Nearshore
Cross-Shore Observations Of Warm, Internal Tide Bores Within The Nearshore Open
Temperature and current observations near Pt. Sal, CA.
View article: <i>Sound Propagation through the Stochastic Ocean</i>: Rebuttal to June 2017 JASA Book Review
<i>Sound Propagation through the Stochastic Ocean</i>: Rebuttal to June 2017 JASA Book Review Open
First Page
View article: Observations of thermohaline sound-speed structure induced by internal waves and spice in the summer 2015 Canada Basin marginal ice zone
Observations of thermohaline sound-speed structure induced by internal waves and spice in the summer 2015 Canada Basin marginal ice zone Open
The Arctic seas are in a period of transition as they adjust to stimuli from anthropogenic climate change. The acoustic response to this adjustment is of fundamental interest, as acoustics provide an important means for Arctic remote sensi…
View article: Equations for normal-mode statistics of sound scattering by a rough elastic boundary in an underwater waveguide, including backscattering
Equations for normal-mode statistics of sound scattering by a rough elastic boundary in an underwater waveguide, including backscattering Open
Underwater sound scattering by a rough sea surface, ice, or a rough elastic bottom is studied. The study includes both the scattering from the rough boundary and the elastic effects in the solid layer. A coupled mode matrix is approximated…
View article: Broadband classification and statistics of echoes from aggregations of fish measured by long-range, mid-frequency sonar
Broadband classification and statistics of echoes from aggregations of fish measured by long-range, mid-frequency sonar Open
For horizontal-looking sonar systems operating at mid-frequencies (1–10 kHz), scattering by fish with resonant gas-filled swimbladders can dominate seafloor and surface reverberation at long-ranges (i.e., distances much greater than the wa…
View article: Eddy properties in the Subtropical Countercurrent, Western Philippine Sea
Eddy properties in the Subtropical Countercurrent, Western Philippine Sea Open
View article: A test of deep water Rytov theory at 284 Hz and 107 km in the Philippine Sea
A test of deep water Rytov theory at 284 Hz and 107 km in the Philippine Sea Open
Predictions of log-amplitude variance are compared against sample log-amplitude variances reported by White, Andrew, Mercer, Worcester, Dzieciuch, and Colosi [J. Acoust. Soc. Am. 134, 3347–3358 (2013)] for measurements acquired during the …
View article: Entropy rate defined by internal wave scattering in long-range propagation
Entropy rate defined by internal wave scattering in long-range propagation Open
The reduction of information capacity of the ocean sound channel due to scattering by internal waves is a potential problem for acoustic communication, navigation, and remote sensing over long ranges. In spite of recent progress in researc…