Southern Greenland ice sheet elevation change estimates are derived from SEASAT and GEOSAT radar altimetry data from 1978 to 1988. Data are confined to 61-72 deg N, 30-50 deg W, above 1700 m elevation. The addition of GEOSAT Geodetic Mission (GM) data results in twice as many crossover points and 50% greater coverage than previous studies. Coverage above 2000 m elevation is improved to 90%, and about 75% of the area between 1700 m and 2000 m is now covered. Data are in ASCII text format, available via FTP, and consist of elevation change rate (dH/dt, cm/year) and corresponding error estimates in 50 km grid cells.
Refer to Davis et al. 2000 for details of orbit error analysis with SEASAT and GEOSAT. Comparison with laser dH/dt results and other in-situ ... data indicates that a typical error value for elevation change estimates in a 50 km cell is approximately +/- 2 cm/yr (Davis et al. 2001).
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Davis, C.H., J.R. McConnell, J. Bolzan, J.L. Bamber, R.H. Thomas, and E. Mosley-Thompson. 2001. Elevation change of the southern Greenland ice sheet from 1978 to 1998: interpretation. Journal of Geophysical Research 106(D24): 33743-33754.
Davis, C.H., C.A. Kluever, B.J. Haines, C. Perez, and Y. ... Yoon. 2000. Improved elevation change measurement of the southern Greenland ice sheet from satellite radar altimetry. IEEE Transactions on Geoscience and Remote Sensing 38(3): 1367-1378.
Davis, C.H, C.A. Kluever, and B.J. Haines. 1998a. Elevation change of the southern Greenland ice sheet. Science 279: 2086-2088.
Davis, C.H., C.A. Kluever, and B.J. Haines. 1998b. Comment: Growth of the southern Greenland ice sheet. Science 281: 1251.
Krabill, W., W. Abdalati, E. Frederick, S. Manizade, C. Martin, J. Sonntag, R.
Swift, R. Thomas, W. Wright, and J. Yungel. 2000. Greenland ice sheet: high-elevation balance and peripheral thinning. Science 289: 428-430.
Krabill, W., E. Frederick, S. Manizade, C. Martin, J. Sonntag, R. Swift, R. Thomas, W. Wright, and J. Yungel. 1999. Rapid thinning of parts of the southern Greenland ice sheet. Science 283: 1522-24. View PDF.
McConnell, J.R., R.J. Arthern, E. Mosley-Thompson, C.H. Davis, R.C. Bales, R. Thomas, J.F. Burkhart, and J.D. Kyne. 2000. Changes in Greenland ice sheet elevation attributed primarily to snow accumulation variability. Nature 406(6798): 877-879.
Thomas, R., T. Akins, B. Csatho, M. Fahnestock, P. Gogineni, C. Kim, and J.
Sonntag. 2000. Mass balance of the Greenland ice sheet at high elevations.
Science 289: 426-428.
Thomas, R.H., C.H. Davis, E. Frederick, S. Manizade, W. Krabill, J. McConnell, and J. Sonntag. 1999. Greenland ice-sheet elevation change since 1978 from radar and laser altimetry. Polar Geography 23(3): 169-184.