Estimation of ice flow velocity of Shirase Glacier and its surrounding landfast ice in East Antarctica using synthetic aperture radar imagery
| Project/Area Number |
18K11627
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 63010:Environmental dynamic analysis-related
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| Research Institution | Nihon University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 氷河 / 定着氷 / 控え壁 / 相互作用 / 合成開口レーダ / 東南極 / 流動 / 白瀬氷河 / 流動速度 / リュツオ・ホルム湾 / 変位 / 画像相関法 / リュツォ・ホルム湾 / 海氷 |
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| Outline of Final Research Achievements |
This study presents that temporal variations in ice flow velocities for Shirase Glacier and its surrounding landfast ice in Lutzow-Holm Bay, East Antarctica were estimated using synthetic aperture radar (SAR) images acquired by the Phased Array L-band SAR-2 (PALSAR-2) onboard Advanced Land Observing Satellite-2 (ALOS-2) in 2015～2018. The images were analyzed using image correlation. The flow velocity at the 10 km downstream from the grounding line of Shirase Glacier shows that flow velocity is considered to be less related to the landfast ice stability. However, the flow velocity around 40 km downstream from the GL show changes related to landfast ice condition. The flow velocity is more increasable of 0.20～0.38 km a-1 under the unstable landfast ice condition than the stable landfast ice condition. Therefore, our results show the velocity of Shirase Glacier are associated with the condition of landfast ice stability or instability.
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| Academic Significance and Societal Importance of the Research Achievements |
海水位の上昇は氷床融解の寄与が最大の不確実性の原因となっているが、過去の海水位の変化は氷床の消長にほぼ依存しており、氷床融解による水位の上昇が懸念される。南極における雪氷の消耗の加速は西南極において顕著であるが、東南極は質量収支（積雪による涵養と海洋へ流出する消耗の和）が均衡していると考えられてきた。しかし、東南極の白瀬氷河を排出口とする氷床の流出量については消耗傾向にあり、白瀬氷河と氷河を取り囲む定着氷の動態の相互作用の理解が喫緊の課題であることを示した。このことから、本研究で明らかとなった氷河を取り囲む定着氷が控え壁の役割を果たすことは、今後、氷河の質量収支を考える上での重要な示唆である。
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Report
(4 results)
Research Products
(20 results)
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[Presentation] Summary of a New Project on Interaction of the Solid Earth and the Antarctic Ice Sheet2019
Author(s)
Fukuda Y., Nishijima J., Kazama T., Nakamura K., Doi K., Suganuma Y., Okuno J., Araya A., Kaneda H., Aoyama Y., Miura H.
Organizer
The 27th IUGG General Assembly 2019
Related Report
Invited
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[Presentation] A New Project on Interaction of the Solid Earth and the Antarctic Ice Sheet2019
Author(s)
Fukuda Y., Nishijima J., Kazama T., Nakamura K., Doi K., Suganuma Y., Okuno J., Araya A., Kaneda H., Aoyama Y., Miura H.
Organizer
XIII International Symposium on Antarctic Earth Sciences
Related Report
Invited
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[Presentation] A new research project on the interaction of the solid Earth and the Antarctic Ice Sheet: Summary of the first year activities2018
Author(s)
福田洋一, 西島潤, 風間卓仁, 中村和樹, 土井浩一郎, 菅沼悠介, 奥野淳一, 新谷昌人, 金田平太郎, 青山雄一, 三浦英樹
Organizer
日本地球惑星科学連合
Related Report
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