Coastal waveform retracking in the slick-rich Sulawesi Sea of Indonesia, based on variable footprint size with homogeneous sea surface roughness

Xifeng Wang, Kaoru Ichikawa, Dongni Wei

研究成果: ジャーナルへの寄稿記事

抄録

Waveforms of radar altimeters are often corrupted due to heterogeneous sea surface roughness within footprints, such as slicks. In past studies, subwaveform retrackers such as the adaptive leading edge subwaveform retracker (ALES) which use only a section of the waveform have been proposed. However, it is difficult to choose a reasonable estimation window from an individual waveform. In the present study, a post-processed subwaveform retracker is proposed which identifies the waveforms of surrounding along-track points. The size of the estimation window is variable and is determined to keep the sea surface roughness within the corresponding footprint homogeneous. The method was applied to seven years of 20 Hz Jason-2 altimeter data over the slick-rich Sulawesi Sea of Indonesia and compared with ALES and sensor geophysical data record (SGDR) products. The standard deviation of the sea surface dynamic heights was around 0.13 m, even without spatial smoothing or some geophysical corrections. This is only 75% and 25% of the ALES and SGDR results, respectively. Moreover, all retrievals of the range, SWH, and sigma0 include less outliers than the other products. These results indicate that the variable estimation windows determined in the present study can adapt well to the variation of sea surface roughness.

元の言語英語
記事番号1274
ジャーナルRemote Sensing
11
発行部数11
DOI
出版物ステータス出版済み - 6 1 2019

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surface roughness
footprint
sea surface
altimeter
sensor
outlier
smoothing
radar
sea
product

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

これを引用

Coastal waveform retracking in the slick-rich Sulawesi Sea of Indonesia, based on variable footprint size with homogeneous sea surface roughness. / Wang, Xifeng; Ichikawa, Kaoru; Wei, Dongni.

:: Remote Sensing, 巻 11, 番号 11, 1274, 01.06.2019.

研究成果: ジャーナルへの寄稿記事

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