Ice-sheet bed 3-D tomography

被引:63
作者
Paden, John [1 ]
Akins, Torry [2 ]
Dunson, David [3 ]
Allen, Chris [4 ,5 ]
Gogineni, Prasad [4 ,5 ]
机构
[1] Vexcel Corp, Boulder, CO 80301 USA
[2] Garmin Int Inc, Olathe, KS 66062 USA
[3] Cypress Energy Serv, Houston, TX 77042 USA
[4] Univ Kansas, Ctr Remote Sensing Ice Sheets, Lawrence, KS 66045 USA
[5] Univ Kansas, Dept EECS, Lawrence, KS 66045 USA
基金
美国国家科学基金会;
关键词
RADAR;
D O I
10.3189/002214310791190811
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Information on bed topography and basal conditions is essential to developing the next-generation ice-sheet models needed to generate a more accurate estimate of ice-sheet contribution to sea-level rise. Synthetic aperture radar (SAR) images of the ice bed can be analyzed to obtain information on bed topography and basal conditions. We developed a wideband SAR, which was used during July 2005 to perform measurements over a series of tracks between the GISP2 and GRIP cores near Summit Camp, Greenland. The wideband SAR included an eight-element receive-antenna array with multiple-phase centers. We applied the MUltiple Signal Classification (MUSIC) algorithm, which estimates direction of arrival signals, to single-pass multichannel data collected as part of this experiment to obtain fine-resolution bed topography. This information is used for producing fine-resolution estimates of bed topography over a large swath of 1600 m, with a 25 m posting and a relative accuracy of approximately 10 m. The algorithm-derived estimate of ice thickness is within 10 m of the GRIP ice-core length. Data collected on two parallel tracks separated by 500 m and a perpendicular track are compared and found to have difference standard deviations of 9.1 and 10.3 m for the parallel and perpendicular tracks, respectively.
引用
收藏
页码:3 / 11
页数:9
相关论文
共 20 条
  • [1] Allen C., 2008, P IEEE RAD C ROM IT, P1428
  • [2] ACCUMULATION-RATE VARIATIONS AROUND SUMMIT, GREENLAND
    BOLZAN, JF
    STROBEL, M
    [J]. JOURNAL OF GLACIOLOGY, 1994, 40 (134) : 56 - 66
  • [3] DUNSON DR, 2006, THESIS U KANSAS
  • [4] An improved coherent radar depth sounder
    Gogineni, S
    Chuah, T
    Allen, C
    Jezek, K
    Moore, RK
    [J]. JOURNAL OF GLACIOLOGY, 1998, 44 (148) : 659 - 669
  • [5] Polar radar for ice sheet measurements (PRISM)
    Gogineni, Sivaprasad
    Braaten, David
    Allen, Chnis
    Paden, John
    Akins, Torry
    Kanagaratnarn, Pannir
    Jezek, Ken
    Prescott, Glenn
    Jayaraman, Gunashekar
    Ramasami, ViJaya
    Lewis, Cameron
    Dunson, David
    [J]. REMOTE SENSING OF ENVIRONMENT, 2007, 111 (2-3) : 204 - 211
  • [6] *GRIP GISP2, 1997, GREENL SUMM IC COR C
  • [7] JEZEK K, 2009, IEEE RAD C 4 8 MAY 2, P1
  • [8] Leuschen C, 2000, INT GEOSCI REMOTE SE, P2570, DOI 10.1109/IGARSS.2000.859643
  • [9] MAST JE, 1994, P SOC PHOTO-OPT INS, V2275, P196, DOI 10.1117/12.186716
  • [10] A TOMOGRAPHIC FORMULATION OF SPOTLIGHT-MODE SYNTHETIC APERTURE RADAR
    MUNSON, DC
    OBRIEN, JD
    JENKINS, WK
    [J]. PROCEEDINGS OF THE IEEE, 1983, 71 (08) : 917 - 925