DTIC ADA275344: Volume Reverberation in the Marginal Ice Zone of Fram Strait

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by  Defense Technical Information Center

AD-A275 344
REVERBERATION
Edited by
D.D. Ellis, J.R. Preston and H.G. Urban
44
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1. Agency Use Only (Leave blank). 2. Report Date. 3. Report Type and Dates Covered.
1 1993 Final - Proceedings
4. Title and Subtitle. 5. Funding Numbers.
Volume Reverberation in the Marginal Ice Zone of Fram Strait ProgramElementNo. 0602435N
Project No. RJ035
6. Author(s). Task No. 121
Marcia A. Wilson and Richard H. Love Accession No. DN496443
Work Unit No. 92432D
7. Performing Organization Name(s) and Address(es). 8. Performing Organization
Naval Research Laboratory Report Number.
Ocean Acoustics Branch PR 92:005:243
Stennis Space Center, MS 39529-5004
9. Sponsoring/Monitoring Agency Name(s) and Address(es). Sponsoring/Monltoring Agency
Naval Research Laboratory NTIS CRA&J Report Number.
Center for Environmental Acoustics DTIC TAB PR 92:005:243
Stennis Space Center. MS 39529-5004 Urannounced [j
Justification
11. Supplementary Notes. By ....
Published in Ocean Reverberation. Distribution/
Availabilitv Codes
12a. Distribution/Availability Statement Avail and/or (cid:127);iv Distribution Code.
.
Approved for public release; distribution is unlimited. Dist Special
13. Abstract (Maximum 200 words).
Many measurements of volume reverberation have been conducted in the open oceans of the world. In May 1988, the Naval
Research Laboratory at Stennis Space Center (NRL-SSC) had the opportunity to investigate volume reverberation in a unique
region: the marginal ice zone (MIZ) of the Fram Strait between Spitsbergen and Greenland. Measurements were made from a
drifting ice camp at three locations over a four day period. Volume scattering strength versus depth profiles were obtained at
frequencies from 3.5 to 50 kHz using short CW pulses from a suite of downward and upward looking transducers. Results show
that scattering layers occurred from about 100 to 200 m and 400 to 500 m at each location, with some variability in strength at
the different locations. Ac omparison with volume scattering strengths reported from other cold water regions shows that values
observed in the Fram Strait MIZ were lower than those reported at similar frequencies from open waters of the Norwegian Sea,
Labrador Sea, and northern Baffin Bay, and comparable to those in the Denmark Strait, Davis Strait, Chukchi Sea MIZ, and
northeast of Iceland.
14. Subject Terms. 15. Number of Pages.
Acoustic propagation, sea ice, arctic ocean 6
16. Price Code.
17. Security Classification 18. Security Classification 19. Security Classification 20. Umitation of Abstract.
of Report. of This Page. of Abstract.
Unclassified Unclassified Unclassified SAR
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