@article{oai:nipr.repo.nii.ac.jp:00010067,
 author = {Nakamura, Kazuki and Doi, Koichiro and Shibuya, Kazuo and Nakamura, Kazuki and Doi, Koichiro and Shibuya, Kazuo},
 issue = {2},
 journal = {Polar science, Polar science},
 month = {Dec},
 note = {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., JERS-1衛星（地球資源衛星1号）の合成開口レーダーデータを用いて白瀬氷河の流動速度の季節変動を調べました。“画像相関法”という手法を用いて、氷河内部の流動場を推定しました。上流域の 1.18 km/a から氷床接地縁付近の 2.32 km/a にかけては急速に速くなりますが、そこでほぼ一定流速となります。下流域では再度徐々に加速し、2.62-2.82 km/a となり末端浮氷舌部では 3.05-3.50 km/a まで加速しています。浮氷舌部の流動速度には、季節変動も認められ、1997年（3.11 km/a）と1998年（3.50 km/a）の年変動は有意な差でした。これには、1998年4-5月の浮氷舌流失が反映していると考えられます。},
 pages = {73--83},
 title = {Estimation of seasonal changes in the flow of Shirase Glacier using JERS-1/SAR image correlation},
 volume = {1},
 year = {2007}
}