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4 Conclusions
Considering the functionality and performances of the oscillating bubble
instrument, described here, we conclude that the instrument is suitable for
oceanographic studies. In particular, the obtained results allow us to assess
the “availability to the surface” of adsorption-film-forming substances, on
a long time scale, and to determine the surface rheological properties. In
other words, we get useful information for describing and interpreting the
behaviour of surfactant films (sea-slicks, formed under weak meteorologi-
cal conditions), which are responsible for wave damping and reflectivity
modulation over a broad range of frequencies (from the visible to the mi-
crowave regions of the spectrum).
Acknowledgements.
This work was supported by the European Commis-
sion DG XII (INCO-Copernicus Contract No. ERB-IC15-CT96-0809, DG
12 - CDPE), INTAS (Ref. No. 96 -1665 ) and by the Italian Space Agency
(Contract No. ASI ARS-96-103).
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