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Recovery of subglacial water extent from Greenland radar survey data

  • G.K.A. Oswald (a1) and S.P. Gogineni (a2)

Abstract

Subglacial water threatens the stability of a deep ice sheet. The Greenland ice sheet has been the subject of extensive radar surveys under NASA’s PARCA program and others, yet the extent of basal water has not previously been explored in detail. This paper provides a method for recovering basal radar reflection characteristics that yield robust discrimination of subglacial water, using PARCA data, by narrowing the spread of measured echo intensities. Sources of validation are provided, and they support the procedure and its results. The method can be extended to the entire Greenland radar dataset. It is not dependent on details of radar characteristics but relies on sufficient penetration performance, high-fidelity data acquisition and appropriate treatment of signals and interface statistics.

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References

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Beckmann, P. and Spizzichino, A.. 1963. The scattering of electromagnetic waves from rough surfaces. New York, Pergamon.
Berry, M.V. 1973. The statistical properties of echoes diffracted from rough surfaces. Philos. Trans. R. Soc. London, Ser. A, 273(1237), 611658.
Catania, G.A., Conway, H.B., Gades, A.M., Raymond, C.F. and Engelhardt, H.. 2003. Bed reflectivity beneath inactive ice streams in West Antarctica. Ann. Glaciol., 36, 287291.
Dahl-Jensen, D., Gundestrup, N., Gogineni, S.P. and Miller, H.. 2003. Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations. Ann. Glaciol., 37, 207212.
Dowdeswell, J.A. and Evans, S.. 2004. Investigations of the form and flow of ice sheets and glaciers using radio-echo sounding. Rep. Progr. Phys., 67(10), 18211861.
Fahnestock, M., Abdalati, W., Joughin, I., Brozena, J. and Gogineni, P.. 2001. High geothermal heat flow, basal melt, and the origin of rapid ice flow in central Greenland. Science, 294(5550), 23382342.
Fountain, A.G., Jacobel, R.W., Schlichting, R. and Jansson, P.. 2005. Fractures as the main pathways of water flow in temperate glaciers. Nature, 433(7026), 618621.
Gades, A.M., Raymond, C.F., Conway, H. and Jacobel, R.W.. 2000. Bed properties of Siple Dome and adjacent ice streams, West Antarctica, inferred from radio-echo sounding measurements. J. Glaciol., 46(152), 8894.
Gogineni, S. and 9 others. 2001. Coherent radar ice thickness measurements over the Greenland ice sheet. J. Geophys. Res., 106(D24), 33,76133,772.
Krabill, W.B. and 8 others. 2002. Aircraft laser altimetry measurements of changes of the Greenland ice sheet: technique and accuracy assessment. J. Geodyn., 34(3–4), 357376.
Layberry, R.L. and Bamber, J.L.. 2001. A new ice thickness and bed data set for the Greenland ice sheet. 2. Relationship between dynamics and basal topography. J. Geophys. Res., 106(D24), 33,78133,788.
Legarsky, J., Chuah, T. and Gogineni, S.P.. 1997. Next-generation coherent radar depth sounder for measurement of Greenland ice sheet thickness. In Proceedings of International Geoscience and Remote Sensing Symposium (IGARSS ’97), 3–8 August 1997, Vol. 2. Piscataway, NJ, Institute of Electrical and Electronic Engineers, 996998.
Oswald, G.K.A. 1975. Investigation of sub-ice bedrock characteristics by radio-echo sounding. J. Glaciol., 15(73), 7587.
Oswald, G.K.A. and Robin, G.de Q.. 1973. Lakes beneath the Antarctic ice sheet. Nature, 245(5423), 251254.
Peters, M.E., Blankenship, D.D. and Morse, D.L.. 2005. Analysis techniques for coherent airborne radar sounding: application to West Antarctic ice streams. J. Geophys. Res., 110(B6), B06303. (10.1029/2004JB003222.)
Robin, G.de Q., Swithinbank, C.W.M. and Smith, B.M.E.. 1970. Radio echo exploration of the Antarctic ice sheet. IASH Publ. 86 (Symposium at Hanover 1968 – Antarctic Glaciological Exploration (ISAGE)), 97115.
Siegert, M.J., Taylor, J., Payne, A.J. and Hubbard, B.. 2004. Macro-scale bed roughness of the Siple Coast ice streams in West Antarctica. Earth Surf. Process. Landf., 29(13), 15911596.
Siegert, M.J., Taylor, J. and Payne, A.J.. 2005. Spectral roughness of subglacial topography and implications for former ice-sheet dynamics in East Antarctica. Global Planet. Change, 45(1–3), 249263.
Skolnik, M.I. 1990. Radar handbook. Second edition. New York, McGraw-Hill.
Thomas, R.H. and Investigators, PARCA. 2001. Program for Arctic Regional Climate Assessment (PARCA): goals, key findings, and future directions. J. Geophys. Res., 106(D24), 33,69133,705.
Zwally, H.J., Abdalati, W., Herring, T., Larson, K., Saba, J. and Steffen, K.. 2002. Surface melt-induced acceleration of Greenland ice-sheet flow. Science, 297(5579), 218222.

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