FN Archimer Export Format
PT J
TI A semiempirical model of the normalized radar cross section of the sea surface, 2. Radar modulation transfer function
BT 
AF KUDRYAVTSEV, V
   HAUSER, D
   CAUDAL, G
   CHAPRON, Bertrand
AS 1:;2:;3:;4:;
FF 1:;2:;3:;4:PDG-DRO-DOPS-LOS;
C1 Natl Acad Sci, Inst Marine Hydrophys, Sevastopol, Ukraine.
   Nansen Int Environm & Remote Sensing Ctr, St Petersburg, Russia.
   Univ Versailles, CNRS, Ctr Etud Environm Terr & Planetaires, Velizy Villacoublay, France.
   Inst Francais Rech Exploitat Mer, Lab Oceanog Spatiale, Plouzane, France.
C2 NATL ACAD SCI, UKRAINE
   NANSEN INT ENVIRONM & REMOTE SENSING CTR, RUSSIA
   UNIV VERSAILLES, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-DRO-DOPS-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.992
TC 26
UR https://archimer.ifremer.fr/doc/00000/10183/9581.pdf
LA English
DT Article
DE ;radar cross section;ocean surface;surface gravity waves;wave breaking;modulation transfer function;non Bragg scattering
AB normalized radar cross section (NRCS) over the sea surface. However, these models are not able to correctly reproduce the NRCS in all configurations. In particular, even if they may provide consistent results for vertical transmit and receive (VV) polarization, they fail in horizontal transmit and receive (HH) polarization. In addition, there are still important discrepancies between model and observations of the radar modulation transfer function (MTF), which relates the modulations of the NRCS to the long waves. In this context, we have developed a physical model that takes into account not only the Bragg mechanism but also the non-Bragg scattering associated with radio wave scattering from breaking waves. The same model was built to explain both the background NRCS and its modulation by long surface wave (wave radar MTF problem). In part 1, the background NRCS model was presented and assessed through comparisons with observations. In this part 2, we extend the model to include a third underlying scale associated with longer waves (wavelength similar to10-300 m) to explain the modulation of the NRCS. Two contributions are distinguished in the model, corresponding to the so-called tilt and hydrodynamic MTF. Results are compared to observations (already published in the literature or derived from the FETCH experiment). As found, taking into account modulation of wave breaking (responsible for the non-Bragg mechanism) helps to bring the model predictions in closer agreement with observations. In particular, the large MTF amplitudes for HH polarization (much larger than for VV polarization) and MTF phases are better interpreted using the present model.
PY 2003
SO Journal Of Geophysical Research Oceans
SN 0148-0227
PU Amer Geophysical Union
VL 108
IS C1
UT 000181554900003
DI 10.1029/2001JC001004
ID 10183
ER

EF