Estimation of seasonal changes in the flow of Shirase Glacier using JERS-1/SAR image correlation
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概要
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This paper presents estimates of detailed seasonal variations in ice-flow velocity for Shirase Glacier calculated using data obtained by Japanese Earth Resources Satellite-1 (JERS-1) synthetic aperture radar (SAR). We used 12 pairs of images (44-day repeat cycle) over the interval from 30 April 1996 to 1 July 1998 to estimate ice-flow fields using an image correlation method. Geometric registration was performed with reference to the RADARSAT Antarctic Mapping Project (RAMP) image dataset. Error analysis based on feature mismatch indicated an absolute error of ±0.30 km/a and relative error of ±0.04 km/a in the estimated flow velocity. The obtained ice-flow velocity increases rapidly from the upstream region (1.18 km/a) to the grounding line, where it becomes stagnant (2.32 km/a), before accelerating gradually to 2.62–2.82 km/a in the downstream region and then increasing to 3.05–3.50 km/a at the terminus of the floating ice tongue. The ice-flow velocities in the downstream region are highly variable, depending on both the distance from the grounding line and the observed epoch (season). Most of the obtained seasonal variations in ice-flow velocity at the floating ice tongue are within the range of the associated error estimate, but the annual difference between 1997 (3.11 km/a) and 1998 (3.50 km/a) is significant, reflecting a possible acceleration in the ice-flow velocity in association with the disappearance of the floating ice tongue between April and May of 1998. In terms of the summer–winter difference in averaged air temperature, the large difference recorded in 1997 (17.0 °C) relative to 1996 (13.9 °C) corresponds to a reduced ice-flow velocity in 1997 (approximately 0.20 km/a) relative to that in 1996 (approximately 0.30 km/a), indicating interactions between air, sea ice, and glacier flow in Lützow-Holm Bay.
- 国立極地研究所の論文
著者
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Doi Koichiro
National Institute of Polar Research, Sokendai, Midori-cho 10-3, Tachikawa-city, Tokyo 190-8518, Jap
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Shibuya Kazuo
National Institute of Polar Research, Sokendai, Midori-cho 10-3, Tachikawa-city, Tokyo 190-8518, Jap
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Nakamura Kazuki
National Institute of Advanced Industrial Science and Technology, Central 2, 1-1-1 Umezono, Tsukuba,
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Shibuya Kazuo
National Inst. Of Polar Res. And Graduate Univ. For Advanced Studies (sokendai) 1-9-10 Kaga Itabashi
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Shibuya Kazuo
National Institute Of Polar Research Sokendai Midori-cho 10-3 Tachikawa-city Tokyo 190-8518 Japan
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Nakamura Kazuki
National Institute Of Advanced Industrial Science And Technology Central 2 1-1-1 Umezono Tsukuba Iba
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Doi Koichiro
National Institute Of Polar Research And Sokendai 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Japan
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Doi Koichiro
National Institute Of Polar Research
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Doi Koichiro
National Institute Of Polar Research Sokendai Midori-cho 10-3 Tachikawa-city Tokyo 190-8518 Japan
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Nakamura Kazuki
National Institute Of Advanced Industrial Science And Technology
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