FN Archimer Export Format
PT J
TI Ka-Band Radar Cross-Section of Breaking Wind Waves
BT 
AF Yurovsky, Yury Yu.
   Kudryavtsev, Vladimir N.
   Grodsky, Semyon A.
   Chapron, Bertrand
AS 1:1;2:1,2;3:3;4:2,4;
FF 1:;2:;3:;4:PDG-ODE-LOPS-SIAM;
C1 Applied Marine Physics Laboratory, Marine Hydrophysical Institute Russian Academy Sci., 2 Kapitanskaya, 299011 Sevastopol, Russia
   Satellite Oceanography Laboratory, Russian State Hydrometeorological University, 98 Malookhtinskiy, 195196 Saint Petersburg, Russia
   Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD 20742, USA
   Laboratoire d’Océanographie Physique Spatiale, Institut Français de Recherche pour l’Exploitation de la Mer, 29280 Plouzané, France
C2 RUSSIAN ACAD SCI, RUSSIA
   UNIV RUSSIAN STATE HYDROMETEOROL, RUSSIA
   UNIV MARYLAND, USA
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer UMR
   DOAJ
   copubli-int-hors-europe
IF 5.349
TC 7
UR https://archimer.ifremer.fr/doc/00697/80937/84824.pdf
   https://archimer.ifremer.fr/doc/00697/80937/84825.zip
LA English
DT Article
DE ;radar;ocean;backscatter;Ka-band;field measurements;breaking wave;breaker;normalized radar cross-section;Lambda-distribution
AB The effective normalized radar cross section (NRCS) of breaking waves, σwb, is empirically derived based on joint synchronized Ka-band radar and video records of the sea surface from a research tower. The σwb is a key parameter that, along with the breaker footprint fraction, Q, defines the contribution of non-polarized backscattering, NP =σwbQ, to the total sea surface NRCS. Combined with the right representation of the regular Bragg and specular backscattering components, the NP component is fundamental to model and interpret sea surface radar measurements. As the first step, the difference between NRCS values for breaking and non-breaking conditions is scaled with the optically-observed Q and compared with the geometric optics model of breaker backscattering. Optically-derived Q might not be optimal to represent the effect of breaking waves on the radar measurements. Alternatively, we rely on the breaking crest length that is firmly detected by the video technique and the empirically estimated breaker decay (inverse wavelength) scale in the direction of breaking wave propagation. A simplified model of breaker NRCS is then proposed using the geometric optics approach. This semi-analytical model parameterizes the along-wave breaker decay from reported breaker roughness spectra, obtained in laboratory experiments with mechanically-generated breakers. These proposed empirical breaker NRCS estimates agree satisfactorily with observations. 
PY 2021
PD MAY
SO Remote Sensing
SN 2072-4292
PU MDPI AG
VL 13
IS 10
UT 000662486400001
DI 10.3390/rs13101929
ID 80937
ER

EF