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Low-Frequency Sea Surface Radar Doppler Echo ArchiMer
Yurovsky, Yury Yu.; Kudryavtsev, Vladimir N.; Grodsky, Semyon A.; Chapron, Bertrand.
The sea surface normalized radar backscatter cross-section (NRCS) and Doppler velocity (DV) exhibit energy at low frequencies (LF) below the surface wave peak. These NRCS and DV variations are coherent and thus may produce a bias in the DV averaged over large footprints, which is important for interpretation of Doppler scatterometer measurements. To understand the origin of LF variations, the platform-borne Ka-band radar measurements with well-pronounced LF variations at frequencies below wave peak (0.19 Hz) are analyzed. These data show that the LF NRCS is coherent with wind speed at 21 m height while the LF DV is not. The NRCS-wind correlation is significant only at frequencies below 0.01 Hz indicating either differences between near-surface wind...
Tipo: Text Palavras-chave: Radar; Ocean; Backscatter; Doppler shift; Wave groups; Non-linearity; Modulation.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00445/55646/57298.pdf
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