Detection of Ice Flow and Deformation of the Antarctic Ice Sheet using JERS-1 SAID Interf erometry

• Ozawa Taku

  Department of Polar Science, The Graduate University for Advanced Studies

• Doi Koichiro

  National Institute of Polar Research

• Shibuya Kazua

  National Institute of Polar Research

Bibliographic Information

Other Title

• JERS-1の干渉合成開口レーダ法を用いた南極氷床流動・変形の検出
• JERS 1 ノ カンショウ ゴウセイ カイコウ レーダホウ オ モチイタ ナンキョク ヒョウショウ リュウドウ ヘンケイ ノ ケンシュツ

Abstract

We applied the three-pass Synthetic Aperture Radar (SAR) interferometry method to the Soya Coast area, East Antarctica, and detected the ice flow field. Although the obtained ice flow from SAR interferometry was constrained to the line-of-sight direction component, the three dimensional ice flow vectors could be estimated by assuming the ice flow direction. Inthe fast ice flow area, the streamlines often appear as bright (white) curves in the intensity image, and the direction of the curve is almost consistent with the ice flow direction. The streamline direction of a certain point on the Langhovde Glacier (point A) can be identified as N86°W, and the ice flow value using this direction and the direction of line-of-sight component of ice flow can be estimated as 86.2 m/yr. If we assume that the ice flow direction is approxi mated by the maximum gradient direction of the ice sheet surface, the ice flow direction of point A results in N64°W, which differs by 22°from the ice flow direction estimated from the streamline. We calculated the maximum shear strain and the dilatation fields from the estimated ice flow vector field. The larger maximum shear strain values around the marginal areas of the ice stream indicate stronger deformation by stress at the transition zone from the slow ice sheet area to the fast ice stream area. On the other hand, there appeared a characteristic con traction area around 600 m height, and we compared its location with the features in the aeromagnetic anomaly maps obtained over the same region. There is a saddle area in the magnetic anomaly map with relative highs near the contraction area. This area may correspond to the topographic rise of the subglacial bedrock relief.

Journal

• Journal of the Geodetic Society of Japan

  Journal of the Geodetic Society of Japan 46 (1), 43-52, 2000-03-25

  The Geodetic Society of Japan

Details

• CRID: 1390001204067250560
• NII Article ID: 130004189715
• NII Article ID: 10004563605
• NII Book ID: AN00134900
• DOI: 10.11366/sokuchi1954.46.43
• ISSN: 2185517X
• ISSN: 00380830
• NDL BIB ID: 5359271
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5359271
• Data Source:
  • JaLC
  • NDL
  • CiNii Articles
• Abstract License Flag: Disallowed