Conference Proceeding

Field studies of natural slicks due to internal waves

Inst. of Appl. Phys., Acad. of Sci., Nizhny Novgorod;
02/1999; DOI:10.1109/IGARSS.1999.773435 ISBN: 0-7803-5207-6 pp.167 - 169 vol.1 In proceeding of: Geoscience and Remote Sensing Symposium, 1999. IGARSS '99 Proceedings. IEEE 1999 International, Volume: 1
Source: IEEE Xplore

ABSTRACT New observations are presented of natural banded slicks and their
associated internal waves (IW), conducted from an oceanographic platform
on the Black Sea in June, 1998. Surface waves were measured with X-band
and Ka-band radars and with an optical spectrum analyzer operating in
the cm and mm surface wavelength ranges; IW were measured with an
STD-probe. Surface films were sampled in both slick and non-slick areas,
and the film elasticity parameter and film concentration variations were
estimated from these samples using laboratory measurements of
capillary-gravity wave damping. The estimated film elasticities for the
slick bands exceeded 20 mN/m, while those in non-slick areas were only a
few mN/m. The most prominent slick bands were detected over IW troughs,
in accordance with theory. The relative cm-mm-scale wave damping
(contrast) in the slick bands was very high (more than an order of
magnitude), reaching a maximum for wavelengths ~1.5 cm. Comparison of
observed wave damping in the banded slicks with hydrodynamic modulation
over IW in nonslick cases has shown that the presence of surfactants
strongly enhances the surface manifestation of the IW

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Keywords

banded slicks
 
capillary-gravity wave damping
 
estimated film elasticities
 
film concentration variations
 
film elasticity parameter
 
hydrodynamic modulation
 
internal waves
 
IW troughs
 
June
 
laboratory measurements
 
natural banded slicks
 
New observations
 
non-slick areas
 
oceanographic platform
 
optical spectrum analyzer
 
Surface films
 
surface manifestation
 
Surface waves
 
wave damping
 
wavelengths ~1.5 cm
 

S.A. Ermakov