衛星干渉合成開口レーダ法の南極氷床域への適用
The synthetic aperture radar (SAR) is an active remote sensing sensor which can create high resolution backscatter intensity images, and has been use for mapping of coastline and ice streams in the Antarctic ice sheet region for all seasons. Recently, SAR interferometry has been applied to generate...
| Main Authors: | , , |
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| Format: | Thesis |
| Language: | Japanese |
| Published: |
2000
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| Subjects: | |
| Online Access: | https://ir.soken.ac.jp/?action=repository_uri&item_id=808 http://id.nii.ac.jp/1013/00000808/ |
| Summary: | The synthetic aperture radar (SAR) is an active remote sensing sensor which can create high resolution backscatter intensity images, and has been use for mapping of coastline and ice streams in the Antarctic ice sheet region for all seasons. Recently, SAR interferometry has been applied to generate a digital elevation model (DEM) and to detect the surface displacements associated with the earthquakes. However, application of the SAR interferometry technique to the ice sheet region in the Antarctic region has not been made enough, and has several problems to be solved. We used the SAR data received by the Japanese Earth Resources Satellite 1 (JERS-1) from the onboard L-band SAR sensor (23.5 cm wavelength) and those by the European Remote Sensing Satellite 1 (ERS-1) from the onboard C-band SAR sensor (5.7 cm wavelength), to study the ice sheet dynamics in the two regions of the East Antarctic ice sheet. The first region was the Casey Bay area, and two SAR data sets obtained on 7 December and 10 December of 1991 by ERS-1 were analyzed. The interferometric processing of the two SAR scenes produced clear interferogram on the Zubchatyy Ice Shelf, which can be related to deformations by ocean tide. Although topographic fringes cannot be removed from the overall fringes, they can be considered as within 0.25 cycle (1.4 cm), since the surface undulation of the Zubchatyy Ice Shelf is within 0～40 m height range. When we suppose that the obtained displacement fringes consist only of the vertical component, the vertical change of the Zubchatyy Ice Shelf during 3 days interval is estimated as 41.5 cm at maximum; this change is consistent with the ocean tide change of 35.2 cm predicted from the ORI96 model by Matsumoto et al. (J. Geophys. Res., 100, 25319-25330, 1996). At the transition zone between the ice sheet area and the ice shelf area, the grounding lines can clearly be identified by 1～3 km wide bands of dense displacement fringes in the interferogram. When appropriate values are adopted at the physical properties of ... |
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