Ice-front variation and tidewater behavior on Helheim and Kangerdlugssuaq Glaciers, Greenland

Journal of Geophysical Research: Earth Surface

Volumn 113, Issue 1, 2008, Pages

  Joughin, Ian ^a   Howat, Ian ^b   Alley, Richard B ^c   Ekstrom, Goran ^d   Fahnestock, Mark ^e   Moon, Twila ^a   Nettles, Meredith ^d   Truffer, Martin ^f   Tsai, Victor C ^g  

^a UNIVERSITY OF WASHINGTON   (United States)

^b OHIO STATE UNIVERSITY   (United States)

^c PENNSYLVANIA STATE UNIVERSITY   (United States)

^d Department of Earth and Environmental Sciences   (United States)

^e UNIVERSITY OF NEW HAMPSHIRE   (United States)

^f UNIVERSITY OF ALASKA FAIRBANKS   (United States)

^g HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

BATHYMETRY; GLACIER; ICE; ICE SHELF; ICE THICKNESS; ICEBERG CALVING; OCEANIC FRONT; SATELLITE IMAGERY; SEISMICITY; SENSITIVITY ANALYSIS; TELESEISMIC WAVE;

ARCTIC; GREENLAND; KANGERLUSSUAQ;

EID: 44449087340     PISSN: None     EISSN: 21699011     Source Type: Journal    
DOI: 10.1029/2007JF000837     Document Type: Article

References (48)

1. Abdalati, W., W. Krabill, E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, W. Wright, and J. Yungel (2001), Outlet glacier and margin elevation changes: Near-coastal thinning of the Greenland ice sheet, J. Geophys. Res., 106, 33,729-33,741.
2. Alley, R. B. (1991), Sedimentary processes may cause fluctuations of tide-water glaciers, Ann. Glaciol., 15, 119-124.
3. Alley, R. B., D. E. Lawson, E. B. Evenson, J. C. Strasser, and G. J. Larson (1998), Glaciohydraulic supercooling: A freeze-on mechanism to create stratified, debris-rich basal ice: II. Theory, J. Glaciol., 44, 563-569.
4. Anandakrishnan, S., D. E. Voigt, R. B. Alley, and M. A. King (2003), Ice stream D flow speed is strongly modulated by the tide beneath the Ross Ice Shelf, Geophys. Res. Lett., 30(7), 1361, doi:10.1029/ 2002GL016329.
5. Bindschadler, R. A., P. L. Vomberger, M. A. King, and L. Padman (2003), Tidally driven stick-slip motion in the mouth of Whillans Ice Stream, Antarctica, Ann. Glaciol., 36, 263-272.
6. Brown, C. S., M. F. Meier, and A. Post (1982), Calving speed of Alaska tidewater glaciers, with application to Columbia Glacier, U.S. Geol. Surv. Prof. Pap., 1258-D.
7. Calkin, P. E., G. C. Wiles, and D. J. Barclay (2001), Holocene coastal glaciation of Alaska, Quat. Sci. Rev., 20, 449-461.
8. Chylek, P., M. K. Dubey, and G. Lesins (2006), Greenland warming of 1920-1930 and 1995-2005, Geophys. Res. Lett., 33, L11707, doi:10.1029/2006GL026510.
9. Echelmeyer, K., and W. D. Harrison (1990), Jakobshavns Isbrae, West Greenland-seasonal-variations in velocity or lack thereof, J. Glaciol., 36, 82-88.
10. Ekstrom, G., M. Nettles, and G. A. Abers (2003), Glacial earthquakes, Science, 302, 622-624.
11. Ekstrom, G., M. Nettles, and V. C. Tsai (2006), Seasonality and increasing frequency of Greenland glacial earthquakes, Science, 311, 1756-1758.
12. Fleisher, P. J., D. H. Cadwell, and E. H. Muller (1998), Tsivat basin conduit system persists through two surges, Bering Piedmont glacier, Alaska, Geol. Soc. Am. Bull., 110, 877-887.
13. Howat, I. M., I. Joughin, S. Tulaczyk, and S. Gogineni (2005), Rapid retreat and acceleration of Helheim Glacier, east Greenland, Geophys. Res. Lett., 32, L22502, doi:10.1029/2005GL024737.
14. Howat I. M., I. Joughin, and T. A. Scambos (2007), Rapid changes in ice discharge from Greenland outlet glaciers, Science, 315, 1559-1561.
15. IPCC (2007), Climate Change 2007: The Physical Science Basis, Summary for Policymakers, 16 pp, www.ipcc.ch.
16. Joughin, I. (2006), Climate change-Greenland rumbles louder as glaciers accelerate, Science, 311, 1719-1720.
17. Joughin, I., S. Tulaczyk, M. Fahnestock, and R. Kwok (1996). A mini-surge on the Ryder Glacier, Greenland, observed by satellite radar interferometry, Science, 274, 228-230.
18. Joughin, I., W. Abdalati, and M. Fahnestock (2004), Large fluctuations in speed on Greenland's Jakobshavn Isbrae glacier, Nature, 432, 608-610.
19. Kamb, B. (1991), Rheological nonlinearity and flow instability in the de-forming bed mechanism of ice stream motion: J. Geophys. Res.-Solid Earth, 96, 16,585-16,595.
20. Krabill, W., et al. (2004), Greenland Ice Sheet: Increased coastal thinning, Geophys. Res. Lett., 31, L24402, doi:10.1029/ 2004GL021533.
21. Luckman, A., T. Murray, R. de Lange, and E. Hanna (2006), Rapid and synchronous ice-dynamic changes in East Greenland, Geophys. Res. Lett., 33, L03503, doi:10.1029/2005GL025428.
22. Luthcke, S. B., H. J. Zwally, W. Abdalati, D. D. Rowlands, R. D. Ray, R. S. Nerem, F. G. Lemoine, J. J. McCarthy, and D. S. Chinn (2006), Recent Greenland ice mass loss by drainage system from satellite gravity observations, Science, 314(5803), 1286-1289, doi:10.1126/ science.1130776.
23. Meier, M. F., and A. Post (1987), Fast tidewater glaciers, J. Geophys. Res., 92, 9051-9058.
24. Nettles, M., et al. (2006), Helheim 2006: Integrated geophysical observations of glacier flow, Eos. Trans. Am. Geophys. Union, 87(42), Fall Meet. Suppl., Abstract S44A-08.
25. O'Neel, S., H. P. Marshall, D. E. McNamara, and W. T. Pfeffer (2007), Seismic detection and analysis of icequakes at Columbia Glacier, AK, J. Geophys. Res., 112, F03S23, doi:10.1029/2006JF000595.
26. Paterson, W. S. B. (1994), The Physics of Glaciers, 3rd Edition, 3rd ed., 480 pp., Pergamon, Oxford.
27. Pfeffer, W. T. (2007), A simple mechanism for irreversible tidewater glacier retreat, J. Geophys. Res., 112, F03S25, doi:10.1029/ 2006JF000590.
28. Rignot, E., and P. Kanagaratnam (2006), Changes in the velocity structure of the Greenland ice sheet, Science, 311, 986-990.
29. Scholz, C. (2002), The Mechanics of Earthquakes and Faulting, 2nd ed., 471 pp., Cambridge University Press, Cambridge.
30. Schoof, C. (2005), The effect of cavitation on glacier sliding, Proc. R. Soc. A-Math. Phys. Eng. Sci., 461, 609-627.
31. Schoof, C. (2007), Ice sheet grounding line dynamics: Steady states, stability and hysteresis, J. Geophys. Res., 112, F03S28, doi:10.1029/2006JF000664.
32. Sohn, H. G., K. C. Jezek, and C. J. van der Veen (1998), Jakobshavn Glacier, West Greenland: 30 years of spaceborne observations, Geophys. Res. Lett., 25, 2699-2702.
33. Thomas, R. H. (2004), Force-perturbation analysis of recent thinning and acceleration of Jakobshavn Isbr ae, Greenland, J. Glaciol., 50, 57-66.
34. Thomas, R. H., W. Abdalati, T. L. Akins, B. M. Csatho, E. B. Frederick, S. P. Gogineni, W. B. Krabill, S. S. Manizade, and E. J. Rignot (2000), Substantial thinning of a major east Greenland outlet glacier, Geophys. Res. Lett., 27, 1291-1294.
35. Thomas, R., E. Frederick, W. Krabill, S. Manizade, and C. Martin (2006), Progressive increase in ice loss from Greenland, Geophys. Res. Lett., 33, L10503, doi:10.1029/2006GL026075.
36. Tsai, V. C., and J. R. Rice (2006), Possible mechanisms for glacial earthquakes, Eos Trans. American Geophysical Union, 87(52), Fall Meet. Suppl., Abstract C41A-0290.
37. Tsai, V. C., and G. Ekstrom (2007), Analysis of glacial earthquakes, J. Geophys. Res., 112, F03S22, doi:10.1029/2006JF000596.
38. Tulaczyk, S., W. B. Kamb, and H. F. Engelhardt (2000), Basal mechanics of Ice Stream B, West Antarctica 1. Till mechanics, J. Geophys. Res., 105, 463-481.
39. van der Veen, C. J. (1998), Fracture mechanics approach to penetration of bottom crevasses on glaciers, Cold Reg. Sci. Tech., 27, 213-223.
40. van der Veen, C. J. (2002), Calving glaciers, Prog. Phys. Geogr., 26, 96-122.
41. Vaughan, D. G. (1995), Tidal flexure at ice shelf margins, J. Geophys. Res., 100, 6213-6224.
42. Velicogna, I., and J. Wahr (2006), Acceleration of Greenland ice mass loss in spring 2004, Nature, 443, 329-331.
43. Vieli, A., M. Funk, and H. Blatter (2001), Flow dynamics of tidewater glaciers: A numerical modelling approach, J. Glaciol., 47, 595-606.
44. Vieli, A., J. Jania, and L. Kolondra (2002), The retreat of a tidewater glacier: Observations and model calculations on Hansbreen, Spitsbergen, J. Glaciol., 48, 592-600.
45. Vieli, A., J. Jania, H. Blatter, and M. Funk (2004), Short-term velocity variations on Hansbreen, a tidewater glacier in Spitsbergen, J. Glaciol., 50, 389-398.
46. Warren, C. R. (1991), Terminal environment topographic control and fluctuations of West Greenland glaciers, Boreas, 20, 1-15.
47. Weidick, A. (1995), Satellite image atlas of glaciers of the world, Greenland, Professional U.S.G.S. Paper, 1386-C.
48. Zwally, H. J., W. Abdalati, T. Herring, K. Larson, J. Saba, and K. Steffen (2002), Surface melt-induced acceleration of Greenland ice-sheet flow, Science, 297, 218-222.