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Khan, Shfaqat Abbas; Liu, Lin; Wahr, John; Howat, Ian M; Joughin, Ian; van Dam, Tonie; Fleming, Kevin (2010): Crustal uplift rates of 4 GPS stations near Jakobshavn Isbrae (2006-2009) [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.811985, Supplement to: Khan, SA et al. (2010): GPS measurements of crustal uplift near Jakobshavn Isbræ due to glacial ice mass loss. Journal of Geophysical Research, 115(B9), B09405, https://doi.org/10.1029/2010JB007490

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Abstract:
We analyze 2006-2009 data from four continuous Global Positioning System (GPS) receivers located between 5 and 150 km from the glacier Jakobshavn Isbrae, West Greenland. The GPS stations were established on bedrock to determine the vertical crustal motion due to the unloading of ice from Jakobshavn Isbrae. All stations experienced uplift, but the uplift rate at Kangia North, only 5 km from the glacier front, was about 10 mm/yr 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 and 4.9 ± 1.1 mm/yr, 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 km**3/yr 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 and 3.2 ± 0.3 mm/yr, 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.
Project(s):
International Polar Year (2007-2008) (IPY)
Coverage:
Median Latitude: 69.111045 * Median Longitude: -52.290005 * South-bound Latitude: 68.719300 * West-bound Longitude: -53.522200 * North-bound Latitude: 69.252500 * East-bound Longitude: -49.814600
Date/Time Start: 2006-01-01T00:00:00 * Date/Time End: 2009-12-31T00:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
4 datasets

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Datasets listed in this publication series

  1. Khan, SA; Liu, L; Wahr, J et al. (2010): (Table 1) Uplift rates, annual amplitude and phase values (relative to Jan 1) for 4 GPS sites near Jakobshavn Isbræ. https://doi.org/10.1594/PANGAEA.811981
  2. Khan, SA; Liu, L; Wahr, J et al. (2010): (Table 2) Uplift rates for 4 GPS sites near Jakobshavn Isbræ using different mapping functions. https://doi.org/10.1594/PANGAEA.811982
  3. Khan, SA; Liu, L; Wahr, J et al. (2010): (Table 4) Uplift rates for 4 GPS sites near Jakobshavn Isbræ assuming various stochastic models. https://doi.org/10.1594/PANGAEA.811983
  4. Khan, SA; Liu, L; Wahr, J et al. (2010): (Table 5) Adjusted and predicted elastic uplift rates for 4 GPS sites near Jakobshavn Isbræ. https://doi.org/10.1594/PANGAEA.811984