GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss

Publication: Research - peer-reviewJournal article – Annual report year: 2010

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DOI

  • Author: Khan, Shfaqat Abbas

    Geodesy, National Space Institute, Technical University of Denmark, Elektrovej, 2800, Kgs. Lyngby, Denmark

  • Author: Liu, Lin

    University of Colorado at Boulder

  • Author: Wahr, John

    University of Colorado at Boulder

  • Author: Howat, Ian

    Ohio State University

  • Author: Joughin, Ian

    University of Washington

  • Author: van Dam, Tonie van

    University of Luxembourg

  • Author: Flemming, Kevin

    Curtin University of Technology, Perth

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We analyze 2006–2009 data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbræ, West Greenland. The GPS stations were established on bedrock to determine the vertical crustal motion due to the unloading of ice from Jakobshavn Isbræ. All stations experienced uplift, but the uplift rate at Kangia North, only 5 km from the glacier front, was about 10 mm yr−1 larger than the rate at Ilulissat, located only ∼45 km further away. This suggests that most of the uplift is due to the unloading of the Earth’s surface as Jakobshavn thins and loses mass. Our estimate of Jakobshavn’s contribution to uplift rates at Kangia North and Ilulissat are 14.6 ± 1.7 mm yr−1 and 4.9 ± 1.1 mm yr−1, respectively. The observed rates are consistent with a glacier thinning model based on repeat altimeter surveys from NASA’s Airborne Topographic Mapper (ATM), which shows that Jakobshavn lost mass at an average rate of 22 ± 2 km3 yr−1 between 2006 and 2009. At Kangia North and Ilulissat, the predicted uplift rates computed using thinning estimates from the ATM laser altimetry are 12.1 ± 0.9 mm yr−1 and 3.2 ± 0.3 mm yr−1, respectively. The observed rates are slightly larger than the predicted rates. The fact that the GPS uplift rates are much larger closer to Jakobshavn than further away, and are consistent with rates inferred using the ATM‐based glacier thinning model, shows that GPS measurements of crustal motion are a potentially useful method for assessing ice‐mass change models.
Original languageEnglish
JournalJournal of Geophysical Research
Publication date2010
Volume115
Journal numberB9
PagesB09405
ISSN0148-0227
DOIs
StatePublished
CitationsWeb of Science® Times Cited: 11
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