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Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean : low mode numbers

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dc.contributor.author Udovydchenkov, Ilya A.
dc.contributor.author Brown, Michael G.
dc.contributor.author Duda, Timothy F.
dc.contributor.author Mercer, James A.
dc.contributor.author Andrew, Rex K.
dc.contributor.author Worcester, Peter F.
dc.contributor.author Dzieciuch, Matthew A.
dc.contributor.author Howe, Bruce M.
dc.contributor.author Colosi, John A.
dc.date.accessioned 2012-06-26T19:44:04Z
dc.date.available 2012-06-26T19:44:04Z
dc.date.issued 2012-06
dc.identifier.citation Journal of the Acoustical Society of America 131 (2012): 4409-4427 en_US
dc.identifier.uri http://hdl.handle.net/1912/5248
dc.description Author Posting. © Acoustical Society of America, 2012. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 131 (2012): 4409-4427, doi:10.1121/1.4707431. en_US
dc.description.abstract The results of mode-processing measurements of broadband acoustic wavefields made in the fall of 2004 as part of the Long-Range Ocean Acoustic Propagation Experiment (LOAPEX) in the eastern North Pacific Ocean are reported here. Transient wavefields in the 50–90 Hz band that were recorded on a 1400 -m long 40 element vertical array centered near the sound channel axis are analyzed. This array was designed to resolve low-order modes. The wavefields were excited by a ship-suspended source at seven ranges, between approximately 50 and 3200 km, from the receiving array. The range evolution of broadband modal arrival patterns corresponding to fixed mode numbers (“modal group arrivals”) is analyzed with an emphasis on the second (variance) and third (skewness) moments. A theory of modal group time spreads is described, emphasizing complexities associated with energy scattering among low-order modes. The temporal structure of measured modal group arrivals is compared to theoretical predictions and numerical simulations. Theory, simulations, and observations generally agree. In cases where disagreement is observed, the reasons for the disagreement are discussed in terms of the underlying physical processes and data limitations. en_US
dc.description.sponsorship This work was supported by the Office of Naval Research, Code 322, Grant Nos. N00014-08-1-0195, N00014-06-1-0245, and N0014-11-1-0194. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher Acoustical Society of America en_US
dc.relation.uri http://dx.doi.org/10.1121/1.4707431
dc.subject Acoustic field en_US
dc.subject Underwater acoustic propagation en_US
dc.title Modal analysis of the range evolution of broadband wavefields in the North Pacific Ocean : low mode numbers en_US
dc.type Article en_US
dc.identifier.doi 10.1121/1.4707431


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