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Retrieval of sea-ice thickness distribution in the Sea of Okhotsk from ALOS/PALSAR backscatter data

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Title: Retrieval of sea-ice thickness distribution in the Sea of Okhotsk from ALOS/PALSAR backscatter data
Authors: Toyota, Takenobu Browse this author →KAKEN DB
Ono, Shuji Browse this author
Cho, Kohei Browse this author
Ohshima, Kay I. Browse this author
Issue Date: May-2011
Publisher: International Glaciological Society
Journal Title: Annals of Glaciology
Volume: 52
Issue: 57
Start Page: 177
End Page: 184
Publisher DOI: 10.3189/172756411795931732
Abstract: Although satellite data are useful for obtaining ice-thickness distribution for perennial sea ice or in stable thin-sea-ice areas, they are still largely an unresolved issue for the seasonal ice zone (SIZ). We address this problem using L-band synthetic aperture radar (SAR). In the SIZ, ice-thickness growth is closely related to deformation, so surface roughness is expected to correlate with ice thickness. L-band SAR, suitable for detecting such surface roughness, is a promising tool for obtaining thickness distribution. This idea was supported by an airborne polarimetric and interferometric SAR (Pi-SAR) validation. To extend this result to spaceborne L-band SAR with coarser resolution, we conducted in situ measurements of ice thickness and surface roughness in February 2008 in the southern Sea of Okhotsk with an icebreaker in coordination with the Advanced Land Observing Satellite (ALOS)/Phased Array-type L-band SAR (PALSAR) orbit. A helicopter-borne laser profiler was used to improve the estimation of surface. roughness. It was found that backscatter coefficients (HH) correlated well with ice thickness (R=0.86) and surface roughness (R=0.70), which confirms the possibility of determining ice-thickness distribution in the SIZ. The interannual variation of PALSAR-derived ice-thickness distribution in the southern Sea of Okhotsk is also discussed.
Rights: © 2011 International Glaciological Society
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 豊田 威信

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