This is forwarded on behalf of Rex Andrew, [EMAIL PROTECTED] Please
reply to him, not to me. -Dave Mellinger
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Dear Colleague,
We would like to draw your attention to our article,
"Ocean ambient sound: Comparing the 1960s with the 1990s
for a receiver off the California coast", by Andrew, Howe,
Mercer and Dzieciuch, which you may find of interest.
We were able to compare ambient noise levels measured at
Pt. Sur in the 1990s (by us) and in the 1960s (by Wenz) and
generally found an increase of up to 10 dB, particularly
in the "shipping" bands.
The article is available online from the electronic journal
Acoustics Research Letters Online (ARLO) at URL:
<a href="http://ojps.aip.org/ARLO/main.jsp";
rel="nofollow">http://ojps.aip.org/ARLO/main.jsp</A>
Navigate to the April 2002 issue (vol. 3, issue 2).
Alternatively, this URL should take you directly to the contents webpage
from which you can download the PDF of GZipped Postscript file:
<a href="http://ojps.aip.org/journal_cgi/dbt?KEY=ARLOFJ&Volume=3&Issue=2";
rel="nofollow">http://ojps.aip.org/journal_cgi/dbt?KEY=ARLOFJ&Volume=3&Issue=2</A>
The abstract is appended below.
Sincerely,
Rex K. Andrew
Applied Physics Laboratory
Seattle, WA
***** ABSTRACT *****
Ocean ambient sound data from 1994 to 2001 have been
collected using a receiver on the continental slope off Point
Sur, California. A temporary, nearby receiving array was
used for calibration purposes. The resulting data set is compared
with long-term averages of earlier measurements made with the
identical receiver over the period from 1963 to 1965. This
comparison shows that the 1994 to 2001 levels exceed the 1963
to 1965 levels by about 10 dB between 20 and 80 Hz and between
200 and 300 Hz, and about 3 dB at 100 Hz. Increases in
(distant) shipping sound levels may account for this.
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Rex K. Andrew [EMAIL PROTECTED]
Applied Physics Laboratory 206.543.1250
University of Washington 206.543.6785 (FAX)
Seattle, Washington, USA <a
href="http://staff.washington.edu/rxandrew";
rel="nofollow">http://staff.washington.edu/rxandrew</A>
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