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Brief Communication Importance of Slope-induced Error Correction in Elevation Change Estimates from Radar Altimetry : Volume 6, Issue 1 (17/01/2012)

By Hurkmans, R. T. W. L.

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Book Id: WPLBN0004022664
Format Type: PDF Article :
File Size: Pages 12
Reproduction Date: 2015

Title: Brief Communication Importance of Slope-induced Error Correction in Elevation Change Estimates from Radar Altimetry : Volume 6, Issue 1 (17/01/2012)  
Author: Hurkmans, R. T. W. L.
Volume: Vol. 6, Issue 1
Language: English
Subject: Science, Cryosphere, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Griggs, J. A., Bamber, J. L., & W. L. Hurkman, R. T. (2012). Brief Communication Importance of Slope-induced Error Correction in Elevation Change Estimates from Radar Altimetry : Volume 6, Issue 1 (17/01/2012). Retrieved from http://nook-library.net/


Description
Description: Bristol Glaciology Centre, School of Geographical Sciences, University of Bristol, Bristol, UK. In deriving elevation change rates (dH/dt) from radar altimetry, the slope-induced error is usually assumed to cancel out in repeat measurements. These measurements, however, represent a location that can be significantly further upslope than assumed, causing an underestimate of the basin-integrated volume change. In a case-study for the fast-flowing part of Jakobshavn Isbræ, we show that a relatively straightforward correction for slope-induced error increases elevation change rates by several metres and increases the volume change by 32% for the region of interest.

Summary
Brief Communication Importance of slope-induced error correction in elevation change estimates from radar altimetry

Excerpt
Bamber, J. L.: Ice sheet altimeter processing scheme, Int. J. Remote Sens., 15, 925–938, doi:10.1080/01431169408954125, 1994.; Bamber, J. and Gomez-Dans, J. L.: The accuracy of digital elevation models of the {A}ntarctic continent, Earth Planet. Sc. Lett., 237, 516–523, doi:10.1016/j.epsl.2005.06.008, 2005.; Bamber, J. L., Ekholm, S., and Krabill, W. B.: A new, high-resolution digital elevation model of {G}reenland fully validated with airborne laser altimeter data, J. Geophys. Res., 106, 6733–6745, 2001.; Brenner, A. C., Bindschadler, R. A., Thomas, R. H., and Zwally, H. J.: Slope-induced errors in radar altimetry over continental ice sheets, J. Geophys. Res., 88, 1617–1623, 1983.; Brenner, A. C., DiMarzio, J. P., and Zwally, H. J.: Precision and accuracy of satellite radar and laser altimeter data over the continental ice sheets, IEEE T. Geosci. Remote., 45, 321–331, doi:10.1109/TGRS.2006.887172, 2007.; Howat, I. M., Smith, B. E., Joughin, I., and Scambos, T. E.: Rates of southeast Greenland ice volume loss from combined ICESat and ASTER observations, Geophys. Res. Lett., 35, L17505, doi:10.1029/2008GL034496, 2008.; Hurkmans, R. T. W. L., Bamber, J. L., S\o rensen, L. S., Joughin, I., Davis, C. H., and Krabill, W.: Spatio-temporal interpolation of elevation changes derived from satellite altimetry for {J}akobshavn {I}sbr\ae, {G}reenland, J. Geophys. Res., in review, 2012.; Joughin, I., Howat, I. M., Fahnestock, M., Smith, B., Krabill, W., Alley, R. B., Stern, H., and Truffer, M.: Continued evolution of J}akobshavn {Isbr\ae following its rapid speedup, J. Geophys. Res., 113, F04006, doi:10.1029/2008JF001023, 2008.; Joughin, I., Smith, B. E., Howat, I. M., Scambos, T., and Moon, T.: Greenland flow variability from ice-sheet-wide velocity mapping, J. Glaciol., 56, 415–430, 2010.; Krabill, W. B., Abdalati, W., Frederick, E. B., Manizade, S. S., Martin, C. F., Sonntag, J. G., Swift, R. N., Thomas, R. H., and Yungel, J. G.: Aircraft laser altimetry measurement of elevation changes of the {G}reenland ice sheet: technique and accuracy assessment, J. Geodyn., 34, 357–376, 2002.; Krabill, W., Hanna, E., Huybrechts, P., Abdalati, W., Cappelen, J., Csatho, B., Frederick, E., Manizade, S., Martin, C., Sonntag, J., Swift, R., Thomas, R., and Yungel, J.: Greenland ice sheet: increased coastal thinning, Geophys. Res. Lett., 31, L24402, doi:10.1029/2004GL021533, 2004.; Li, Y. and Davis, C. H.: Decadal mass balance of the G}reenland and {A}ntarctic ice sheets from high resolution elevation change analysis of {ERS-2 and ENVISAT radar altimetry measurements, In: Proceedings of International Geoscience and Remote Sensing Symposium, vol. 4, 339–342, Boston, MA, 2008.; Moholdt, G., Nuth, C., Hagen, J.-O., and Kohler, J.: Recent elevation changes of S}valbard glaciers derived from {ICESat laser altimetry, Remote Sens. Environ., 114, 2756–2767,

 

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