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Brian Dushaw

Affiliate

Email

dushaw@apl.washington.edu

Research Interests

Oceanography, Reciprocal Acoustic Tomography, Geophysical Inverse Theory

Biosketch

Dr. Dushaw began his career with the analysis and oceanographic interpretation of tomographic data collected during the 1987 Reciprocal Tomography Experiment (RTE87) in the North Pacific. For the past few years he has worked on the tidal variations detected tomographically during the 1991-1992 Acoustic Mid-Ocean Dynamics Experiment (AMODE) in the North Atlantic. The work on tides continues as part of the farfield component of the Hawaii Ocean Mixing Experiment (HOME).

In addition, Dr. Dushaw has taken the lead in the analysis of long-range acoustic data collected by SOSUS arrays during the Acoustic Thermometry of Ocean Climate (ATOC) project. Dr. Dushaw has authored numerous papers and reports on the oceanographic and acoustic problems addressed by ocean acoustic tomography. Dr. Dushaw was a postdoctoral research scientist at APL-UW from 1992-1994 and joined the Laboratory staff in 1994.

Department Affiliation

Acoustics

Education

B.A. Physics, Occidental College, 1983

M.A. Physics, University of California, Davis, 1985

Ph.D. Physical Oceanography, Scripps Institution of Oceanography, 1992

Publications

2000-present and while at APL-UW

WIGWAM reverberation revisited

Dushaw, B.D., "WIGWAM reverberation revisited," Bull. Seismol. Soc. Am., 105, 2242-2249, doi:10.1785/0120150024 , 2015.

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1 Aug 2015

Operation WIGWAM was a test of a 30 kt nuclear depth charge conducted in deep water 500 miles southwest of San Diego on 14 May 1955. Its primary purpose was to determine the effectiveness of that device as an antisubmarine weapon. The acoustic pulse from the test, initially an intense shockwave, radiated throughout the North and South Pacific Oceans. Acoustic reflections from topographic features were recorded for several hours after the explosion by SOund Fixing And Ranging (SOFAR) hydrophones at Point Sur, California, and Kaneohe, Hawaii. Sheehy and Halley (1957) identified peaks of the recorded coda with reflections from specific topographic features at great distances (e.g., the Hawaiian Islands, French Polynesia, or Fiji). With modern data for seafloor topography and ocean sound speed, these coda were computed with surprising accuracy using simple geodesic rays reflected from islands and seamounts. The intensity variations of the coda are mostly determined by simple ray geometry, together with modest attenuation. Coda peaks are often obtained from rays arriving simultaneously from multiple, but disparate, topographic features.

An Empirical Model for Mode-1 Internal Tides Derived from Satellite Altimetry: Computing Accurate Tidal Prediction at Arbitrary Points Over the World Oceans

Dushaw, B.D., "An Empirical Model for Mode-1 Internal Tides Derived from Satellite Altimetry: Computing Accurate Tidal Prediction at Arbitrary Points Over the World Oceans," Technical Memorandum, APL-UW TM 1-15, Applied Physics Laboratory, University of Washington, Seattle, July 2015, 113 pp.

27 Jul 2015

Multipurpose acoustic networks in the integrated Arctic Ocean observing system

Mikhalevsky, P.N., H. Sagen, P.F. Worcester, A.B. Baggeroer, J. Orcutt, S.E. Moore, C.M. Lee, J. Vigness-Raposa, L. Freitag, M. Arrott, K. Atakan, A. Beszczynska-Moller, T.F. Duda, B.D. Dushaw, J.C. Gascard, A.N. Gavrilov, H. Keers, A.K. Morozov, W.H. Munk, M. Rixen, S. Sandven, E. Skarsoulis, K.M. Stafford, F. Vernon, and M.Y. Yuen, "Multipurpose acoustic networks in the integrated Arctic Ocean observing system," Arctic, 68, 5 (Suppl. 1), doi:10.14430/arctic4449, 2015.

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1 Jan 2015

The dramatic reduction of sea ice in the Arctic Ocean will increase human activities in the coming years. This activity will be driven by increased demand for energy and the marine resources of an Arctic Ocean accessible to ships. Oil and gas exploration, fisheries, mineral extraction, marine transportation, research and development, tourism, and search and rescue will increase the pressure on the vulnerable Arctic environment. Technologies that allow synoptic in situ observations year-round are needed to monitor and forecast changes in the Arctic atmosphere-ice-ocean system at daily, seasonal, annual, and decadal scales. These data can inform and enable both sustainable development and enforcement of international Arctic agreements and treaties, while protecting this critical environment. In this paper, we discuss multipurpose acoustic networks, including subsea cable components, in the Arctic. These networks provide communication, power, underwater and under-ice navigation, passive monitoring of ambient sound (ice, seismic, biologic, and anthropogenic), and acoustic remote sensing (tomography and thermometry), supporting and complementing data collection from platforms, moorings, and vehicles. We support the development and implementation of regional to basin-wide acoustic networks as an integral component of a multidisciplinary in situ Arctic Ocean observatory.

More Publications

Acoustics Air-Sea Interaction & Remote Sensing Center for Environmental & Information Systems Center for Industrial & Medical Ultrasound Electronic & Photonic Systems Ocean Engineering Ocean Physics Polar Science Center
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