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Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front

Research output: Contribution to journalArticle

DOI

Standard

Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front. / Lynch, J F ; Newhall, A E ; Sperry, B ; Gawarkiewicz, G ; Fredricks, A ; Tyack, P ; Chiu, C S ; Abbot, P .

In: IEEE Journal of Oceanic Engineering, Vol. 28, No. 1, 01.2003, p. 129-150.

Research output: Contribution to journalArticle

Harvard

Lynch, JF, Newhall, AE, Sperry, B, Gawarkiewicz, G, Fredricks, A, Tyack, P, Chiu, CS & Abbot, P 2003, 'Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front', IEEE Journal of Oceanic Engineering, vol. 28, no. 1, pp. 129-150. https://doi.org/10.1109/JOE.2003.808833

APA

Lynch, J. F., Newhall, A. E., Sperry, B., Gawarkiewicz, G., Fredricks, A., Tyack, P., ... Abbot, P. (2003). Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front. IEEE Journal of Oceanic Engineering, 28(1), 129-150. https://doi.org/10.1109/JOE.2003.808833

Vancouver

Lynch JF, Newhall AE, Sperry B, Gawarkiewicz G, Fredricks A, Tyack P et al. Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front. IEEE Journal of Oceanic Engineering. 2003 Jan;28(1):129-150. https://doi.org/10.1109/JOE.2003.808833

Author

Lynch, J F ; Newhall, A E ; Sperry, B ; Gawarkiewicz, G ; Fredricks, A ; Tyack, P ; Chiu, C S ; Abbot, P . / Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front. In: IEEE Journal of Oceanic Engineering. 2003 ; Vol. 28, No. 1. pp. 129-150.

Bibtex - Download

@article{ac4ff5074e9b4217972c6fec0479e030,
title = "Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front",
abstract = "The spatial and temporal variability of the acoustic field in the region of a strong coastal shelfbreak front are examined, using the high-resolution environmental data from the 1996-1997 New England shelfbreak PRIMER experiment to provide input to acoustic propagation models. Specifically, the {"}SeaSoar{"}undulating conductivity-temperature-depth (CTD) probe across-shelf transects provide 1-km along-track resolution, including the front, during the spring, summer, and winter seasons. These data allow one to study the diurnal and seasonal temporal variation of the acoustic field, as well as the varying spatial structure of the field. Using the RAM parabolic equation code, across-shelf acoustic field structure at 200, 400, and 1000 Hz is studied for various source depths. A number of interesting propagation effects are noted, the most interesting of which are the inhibition of strong acoustic-bottom interaction by the warm shelf water beneath the shelfbreak front and the existence of small-scale ducts near the front, due to offshore transport. Data from the vertical line arrays deployed as part of PRIMER offer partial validation of the predictions made. Specifically, it is seen that the mean received levels are in reasonable accord with propagation calculations made using locally measured bottom properties an the SeaSoar water-column measurements. However, due to the scattering of sound by strong nonlinear internal-wave (solitons), the low-frequency variability seen in the acoustic data is less than that predicted solely on the basis of SeaSoar records, which preferentially samples the oceanography on scales larger than internal waves.",
author = "Lynch, {J F} and Newhall, {A E} and B Sperry and G Gawarkiewicz and A Fredricks and P Tyack and Chiu, {C S} and P Abbot",
year = "2003",
month = "1",
doi = "10.1109/JOE.2003.808833",
language = "English",
volume = "28",
pages = "129--150",
journal = "IEEE Journal of Oceanic Engineering",
issn = "0364-9059",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Spatial and temporal variations in acoustic propagation characteristics at the New England shelfbreak front

AU - Lynch, J F

AU - Newhall, A E

AU - Sperry, B

AU - Gawarkiewicz, G

AU - Fredricks, A

AU - Tyack, P

AU - Chiu, C S

AU - Abbot, P

PY - 2003/1

Y1 - 2003/1

N2 - The spatial and temporal variability of the acoustic field in the region of a strong coastal shelfbreak front are examined, using the high-resolution environmental data from the 1996-1997 New England shelfbreak PRIMER experiment to provide input to acoustic propagation models. Specifically, the "SeaSoar"undulating conductivity-temperature-depth (CTD) probe across-shelf transects provide 1-km along-track resolution, including the front, during the spring, summer, and winter seasons. These data allow one to study the diurnal and seasonal temporal variation of the acoustic field, as well as the varying spatial structure of the field. Using the RAM parabolic equation code, across-shelf acoustic field structure at 200, 400, and 1000 Hz is studied for various source depths. A number of interesting propagation effects are noted, the most interesting of which are the inhibition of strong acoustic-bottom interaction by the warm shelf water beneath the shelfbreak front and the existence of small-scale ducts near the front, due to offshore transport. Data from the vertical line arrays deployed as part of PRIMER offer partial validation of the predictions made. Specifically, it is seen that the mean received levels are in reasonable accord with propagation calculations made using locally measured bottom properties an the SeaSoar water-column measurements. However, due to the scattering of sound by strong nonlinear internal-wave (solitons), the low-frequency variability seen in the acoustic data is less than that predicted solely on the basis of SeaSoar records, which preferentially samples the oceanography on scales larger than internal waves.

AB - The spatial and temporal variability of the acoustic field in the region of a strong coastal shelfbreak front are examined, using the high-resolution environmental data from the 1996-1997 New England shelfbreak PRIMER experiment to provide input to acoustic propagation models. Specifically, the "SeaSoar"undulating conductivity-temperature-depth (CTD) probe across-shelf transects provide 1-km along-track resolution, including the front, during the spring, summer, and winter seasons. These data allow one to study the diurnal and seasonal temporal variation of the acoustic field, as well as the varying spatial structure of the field. Using the RAM parabolic equation code, across-shelf acoustic field structure at 200, 400, and 1000 Hz is studied for various source depths. A number of interesting propagation effects are noted, the most interesting of which are the inhibition of strong acoustic-bottom interaction by the warm shelf water beneath the shelfbreak front and the existence of small-scale ducts near the front, due to offshore transport. Data from the vertical line arrays deployed as part of PRIMER offer partial validation of the predictions made. Specifically, it is seen that the mean received levels are in reasonable accord with propagation calculations made using locally measured bottom properties an the SeaSoar water-column measurements. However, due to the scattering of sound by strong nonlinear internal-wave (solitons), the low-frequency variability seen in the acoustic data is less than that predicted solely on the basis of SeaSoar records, which preferentially samples the oceanography on scales larger than internal waves.

U2 - 10.1109/JOE.2003.808833

DO - 10.1109/JOE.2003.808833

M3 - Article

VL - 28

SP - 129

EP - 150

JO - IEEE Journal of Oceanic Engineering

JF - IEEE Journal of Oceanic Engineering

SN - 0364-9059

IS - 1

ER -

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