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Fig. 5.
Radar Doppler spectra measured at vertical polarizations (VV) and differ-
ent wind speeds (0, 2, 4, 6, 8, 10 m s
-1
, from top to bottom, left to right). The water
surface was covered by an OLA slick. Dashed line: wind only, solid line: rain and
wind
The Doppler spectra measured at HV-polarisation at a rain rate of
160 mm h
-1
(solid curves in Figure 6) are very similar in the whole wind-
speed range used in the present investigation: they show a symmetric,
broad peak with its maximum at about -40 dB. The location of this maxi-
mum, however, depends on wind speed because of the wind-induced sur-
face drift. From this finding we conclude that the radar backscattering at
cross-polarisation from a slick-covered water surface agitated by rain is
