den Ouden, M A G; Reijmer, Carleen H; Pohjola, Veijo A; van de Wal, Roderik S W; Oerlemans, Johannes; Boot, Wim (2010): Ice velocities of Nordenskiöldbreen glacier, Svalbard [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.809087, Supplement to: den Ouden, MAG et al. (2010): Stand-alone single-frequency GPS ice velocity observations on Nordenskiöldbreen, Svalbard. The Cryosphere, 4(4), 593-604, https://doi.org/10.5194/tc-4-593-2010
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Abstract:
Precise measurements of ice-flow velocities are necessary for a proper understanding of the dynamics of glaciers and their response to climate change. We use stand-alone single-frequency GPS receivers for this purpose. They are designed to operate unattended for 1-3 years, allowing uninterrupted measurements for long periods with hourly temporal resolution. We present the system and illustrate its functioning using data from 9 GPS receivers deployed on Nordenskiöldbreen, Svalbard, for the period 2006-2009. The accuracy of the receivers is 1.62 m based on the standard deviation in the average location of a stationary reference station (NBRef). Both the location of NBRef and the observed flow velocities agree within one standard deviation with DGPS measurements. Periodicity (6, 8, 12, 24 h) in the NBRef data is largely explained by the atmospheric, mainly ionospheric, influence on the GPS signal. A (weighed) running-average on the observed locations significantly reduces the standard deviation and removes high frequency periodicities, but also reduces the temporal resolution. Results show annual average velocities varying between 40 and 55 m/yr at stations on the central flow-line. On weekly to monthly time-scales we observe a peak in the flow velocities (from 60 to 90 m/yr) at the beginning of July related to increased melt-rates. No significant lag is observed between the timing of the maximum speed between different stations. This is likely due to the limited temporal resolution after averaging in combination with the relatively small distance (max. ±13 km) between the stations.
Project(s):
Coverage:
Median Latitude: 78.694340 * Median Longitude: 17.202700 * South-bound Latitude: 78.632000 * West-bound Longitude: 16.975000 * North-bound Latitude: 78.758000 * East-bound Longitude: 17.414000
Date/Time Start: 2006-03-29T00:00:00 * Date/Time End: 2009-05-29T00:00:00
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:
2 datasets
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Datasets listed in this publication series
- den Ouden, MAG; Reijmer, CH; Pohjola, VA et al. (2010): (Table 4) GPS measured ice velocities at Nordenskiöldbreen glacier. https://doi.org/10.1594/PANGAEA.809085
- den Ouden, MAG; Reijmer, CH; Pohjola, VA et al. (2010): (Table 5) Annual flow velocities at Nordenskiöldbreen glacier. https://doi.org/10.1594/PANGAEA.809086