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Ice radar investigation at Dome A, East Antarctica: Ice thickness and subglacial topography

Abstract

Dome A, located in the central East Antarctic ice sheet (EAIS), is the highest summit of the Antarctic ice sheet. From ice-sheet evolution modeling results, Dome A is likely to preserve over one million years of the Earth’s paleo-climatic and -environmental records, and considered an ideal deep ice core drilling site. Ice thickness and subglacial topography are critical factors for ice-sheet models to determine the timescale and location of a deep ice core. During the 21st and 24th Chinese National Antarctic Research Expedition (CHINARE 21, 2004/05; CHINARE 24, 2007/08), ground-based ice radar systems were used to a three-dimensional investigation in the central 30 km×30 km region at Dome A. The successfully obtained high resolution and accuracy data of ice thickness and subglacial topography were then interpolated into the ice thickness distribution and subglacial topography digital elevation model (DEM) with a regular grid resolution of 140.5 m×140.5 m. The results of the ice radar investigation indicate that the average ice thickness in the Dome A central 30 km×30 km region is 2233 m, with a minimal ice thickness of 1618 m and a maximal ice thickness of 3139 m at Kunlun Station. The subglacial topography is relatively sharp, with an elevation range of 949–2445 m. The typical, clear mountain glaciation morphology is likely to reflect the early evolution of the Antarctic ice sheet. Based on the ice thickness distribution and subglacial topography characteristics, the location of Kunlun Station was suggested to carry out the first high-resolution, long time-scale deep ice core drilling. However, the internal structure and basal environments at Kunlun Station still need further research to determine.

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References

  1. Xiao C D, Li Y S, Hou S G, et al. Preliminary evidence indicating Dome A (Antarctica) satisfying preconditions for drilling the oldest ice core. Chinese Sci Bull, 2008, 53: 102–106

    Article  Google Scholar 

  2. Hou S G, Li Y S, Xiao C D, et al. Recent accumulation rate at Dome A, Antarctica. Chinese Sci Bull, 2007, 52: 428–431

    Article  Google Scholar 

  3. Zhang S, Dongcheng E, Wang Z, et al. Ice velocity from static GPS observations along the transect from Zhongshan station to Dome A, East Antarctica. Ann Glaciol, 2008, 48: 113–118

    Article  Google Scholar 

  4. Ren J W, Xiao C D, Hou S G, et al. New focuses of polar ice-core study: NEEM and Dome A. Chinese Sci Bull, 2009, 54: 1009–1011

    Article  Google Scholar 

  5. Masson V, Vimeux F, Jouzel J, et al. Holocene climate variability—China’s hunt for climate clues reaches a peak. Nature, 2005, 433: 564

    Google Scholar 

  6. IPICS. The oldest ice core: A 1.5 million year record of climate and greenhouse gases from Antarctica. http://www.pages-igbp.org/ipics/documents.html, 2008.

  7. Drewry D J. Antarctica: Glaciological and Geophysical Folio. Cambridge: University of Cambridge, Scott Polar Research Institute Press, 1983

    Google Scholar 

  8. Lythe M B, Vaughan D. The BEDMAP consortium. BEDMAP: A new ice thickness and subglacial topographic model of Antarctica. J Geophys Res, 2001, 106: 11335–11351

    Article  Google Scholar 

  9. Gogineni S, Chuah T, Allen C, et al. An improved coherent radar depth sounder. J Glaciol, 1998, 44: 659–669

    Google Scholar 

  10. Liu H, K Jezek, B Li, et al. Radarsat Antarctic Mapping Project digital elevation model version 2. Boulder, CO: National Snow and Ice Data Center, 2001

    Google Scholar 

  11. Bianchi C, Cafarella L, Michelis D P, et al. Radio Echo Sounding (RES) investigations at Talos Dome (East Antarctica): bedrock topography and ice thickness. Ann Geophys, 2003, 46: 1265–1270

    Google Scholar 

  12. Welch B C, Jacobel R W. Analysis of deep penetrating radar surveys of West Antarctica, US-ITASE 2001. Geophys Res Lett, 2003, 30: 1444, doi:10.1029/2003GL017210

    Article  Google Scholar 

  13. Rippin D M, Bamber J, Siegert M, et al. Basal topography and ice flow in the Bailey/Slessor region of East Antarctica. J Geophys Res, 2003, 108: 6008, oi:10.1029/2003JF000039

    Article  Google Scholar 

  14. Watson D. Contouring: A Guide to the Analysis and Display of Spatial Data. London: Pergamon Press, 1992

    Google Scholar 

  15. Cheng X, Gong P, Zhang Y, et al. Surface topography of Dome A, Antarctica, from differential GPS measurements. J Glaciol, 2009, 55: 185–187

    Article  Google Scholar 

  16. Xiao C D, Ren J W, Hou S G, et al. Surface characteristics at Dome A (Antarctica) obtained during the first field investigations in 2004/05: A guide to future ice-coring sites. Ann Glaciol, 2008, 48: 82–87

    Article  Google Scholar 

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Correspondence to Bo Sun.

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Cui, X., Sun, B., Tian, G. et al. Ice radar investigation at Dome A, East Antarctica: Ice thickness and subglacial topography. Chin. Sci. Bull. 55, 425–431 (2010). https://doi.org/10.1007/s11434-009-0546-z

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  • DOI: https://doi.org/10.1007/s11434-009-0546-z

Keywords

  • Antarctica
  • ice sheet
  • Dome A
  • ice radar
  • ice thickness
  • subglacial topography
  • deep ice core