🚀 go-pugleaf

In <Cn3AA5.Bpv@unocal.com>, stgprao@st.unocal.COM (Richard Ottolini) writes:
>
>1) It sounds like the experiment maay be done too often.  Repeating it
>on a yearly basis may be adequate.  The global ocean temeperature is not
>going to change that rapidly.  There may be some unknown seasonal variation.
>

The frequency of transmissions is required to have statistical validity
in the transmission time measurement.  Seasonal and even tidal variations
will affect the signals.  Contrary to what some people are
saying, the source level is the same order of magnitude as the noise
that whales themselves make (180 to 190 dB for many large species).
Special signal processing is required to dig the signals out of the
background or ambient ocean noise at the destination.  Last time I checked
there was no move afoot to prevent whales from producing loud noises
that might disturb other whales.

>2) These sound experiments may be the best experiment devised so far to
>ascertain whether global warming is occuring.  Atmospheric meaasurements
>have too many local effects.

Amen.  I'm beginning to wonder whether some people want an answer to
the question, though.

P.J. Rovero                   Internet: rovero@oc.nps.navy.mil
Code OC/Rv                    Packet:   kk1d@k6ly
Naval Postgraduate School
Monterey, CA 93943