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- W2028559018 abstract "It is demonstrated that low-frequency (<50 Hz) transmission loss (TL) in the Arctic SOFAR channel for shallow sources and receivers (depth<four wavelengths) is insensitive to the angular dependence of the ice-scattering loss. Existing data of shallow sources and receivers, therefore, cannot distinguish the various published ice-scattering models based solely on the predicted angular dependence of the ice-scattering loss. Specifically, it is shown, using the 17.75- and 47-Hz TL data of DiNapoli and Mellen [Low frequency attenuation in the Arctic Ocean,’’ in Ocean Seismo-Acoustics, edited by T. Akal and J. Berkson (Plenum, New York, 1986).] as constraints, that the TL for shallow sources and receivers is determined predominantly by the first mode attenuation and is insensitive to the higher mode attenuations associated with ice-scattering loss at higher angles. Measurements of the first mode attenuation coefficients at 17.75 and 47 Hz are presented in this article. It is found that transmission loss based on the measured first mode attenuation coefficients agrees well with the DiNapoli data independently determined in the same ocean basin. The magnitude of the first mode attenuation coefficient has significant experimental implications. It is found that a 1-km-long vertical array offers little chance of distinguishing the various angular dependence models at 17.75 Hz (based on range-averaged transmission loss data or incoherently summed modal amplitudes), whereas a 300-m-long vertical array may do so at 47 Hz based on long-range (>250 km) range-averaged propagation data. It is also found that transmission loss varies significantly with source depth; consequently, transmission loss curves determined from data for multiple source depths have an inherent (not experimentally related) uncertainty of several dB and thus cannot shed light on the angular dependence of ice-scattering loss." @default.
- W2028559018 created "2016-06-24" @default.
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- W2028559018 date "1989-03-01" @default.
- W2028559018 modified "2023-10-18" @default.
- W2028559018 title "Low-frequency transmission loss in the Arctic SOFAR channel for shallow sources and receivers" @default.
- W2028559018 doi "https://doi.org/10.1121/1.397443" @default.
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