Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/222398
Title: SST Dependence of Ku- and C-Band Backscatter Measurements
Authors: Zhixiong Wang;Ad Stoffelen;Franco Fois;Anton Verhoef;Chaofang Zhao;Mingsen Lin;Ge Chen
Year: 2017
Publisher: IEEE
Abstract: The normalized radar cross section (NRCS) measured by satellite ocean radar systems is representative of the sea surface roughness at the scale of gravity-capillary waves, which are not only dominated by winds, but also modulated by some secondary factors such as sea surface temperature (SST) and sea surface salinity (SSS). In this paper, the variations of NRCS due to SST changes, depending on scatterometer radar frequency, polarization, and incidence angle, are investigated on the basis of a physics-based radar backscatter model and a dataset of collocated ASCAT C-band and RapidScat Ku-band scatterometer measurements. The study shows that the SST effects are substantial at Ku-band, but rather negligible for C-band NRCS measurements. Furthermore, the SST effects are wind speed dependent and more pronounced in VV polarization and at higher incidence angles. SSS effects, due to dielectric constant, surface tension, and dynamic viscosity variations, on scatterometer winds are limited (within 1&x0025;). This study concludes that it is necessary to take SST into account in scatterometer wind retrieval for radar wavelengths smaller than C-band.
URI: http://localhost/handle/Hannan/222398
volume: 10
issue: 5
More Information: 2135,
2146
Appears in Collections:2017

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7560878.pdf979.29 kBAdobe PDF
Title: SST Dependence of Ku- and C-Band Backscatter Measurements
Authors: Zhixiong Wang;Ad Stoffelen;Franco Fois;Anton Verhoef;Chaofang Zhao;Mingsen Lin;Ge Chen
Year: 2017
Publisher: IEEE
Abstract: The normalized radar cross section (NRCS) measured by satellite ocean radar systems is representative of the sea surface roughness at the scale of gravity-capillary waves, which are not only dominated by winds, but also modulated by some secondary factors such as sea surface temperature (SST) and sea surface salinity (SSS). In this paper, the variations of NRCS due to SST changes, depending on scatterometer radar frequency, polarization, and incidence angle, are investigated on the basis of a physics-based radar backscatter model and a dataset of collocated ASCAT C-band and RapidScat Ku-band scatterometer measurements. The study shows that the SST effects are substantial at Ku-band, but rather negligible for C-band NRCS measurements. Furthermore, the SST effects are wind speed dependent and more pronounced in VV polarization and at higher incidence angles. SSS effects, due to dielectric constant, surface tension, and dynamic viscosity variations, on scatterometer winds are limited (within 1&x0025;). This study concludes that it is necessary to take SST into account in scatterometer wind retrieval for radar wavelengths smaller than C-band.
URI: http://localhost/handle/Hannan/222398
volume: 10
issue: 5
More Information: 2135,
2146
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7560878.pdf979.29 kBAdobe PDF
Title: SST Dependence of Ku- and C-Band Backscatter Measurements
Authors: Zhixiong Wang;Ad Stoffelen;Franco Fois;Anton Verhoef;Chaofang Zhao;Mingsen Lin;Ge Chen
Year: 2017
Publisher: IEEE
Abstract: The normalized radar cross section (NRCS) measured by satellite ocean radar systems is representative of the sea surface roughness at the scale of gravity-capillary waves, which are not only dominated by winds, but also modulated by some secondary factors such as sea surface temperature (SST) and sea surface salinity (SSS). In this paper, the variations of NRCS due to SST changes, depending on scatterometer radar frequency, polarization, and incidence angle, are investigated on the basis of a physics-based radar backscatter model and a dataset of collocated ASCAT C-band and RapidScat Ku-band scatterometer measurements. The study shows that the SST effects are substantial at Ku-band, but rather negligible for C-band NRCS measurements. Furthermore, the SST effects are wind speed dependent and more pronounced in VV polarization and at higher incidence angles. SSS effects, due to dielectric constant, surface tension, and dynamic viscosity variations, on scatterometer winds are limited (within 1&x0025;). This study concludes that it is necessary to take SST into account in scatterometer wind retrieval for radar wavelengths smaller than C-band.
URI: http://localhost/handle/Hannan/222398
volume: 10
issue: 5
More Information: 2135,
2146
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7560878.pdf979.29 kBAdobe PDF