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  • 1
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    (Table 5) Annual flow velocities at Nordenskiöldbreen glacier
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: average of all velocity values for a given period; Elevation of event; Event label; GPS_NB1; GPS_NB2; GPS_NB3; GPS_NB4; GPS_NB5H; GPS_NB6; GPS_NB7; GPS_NB8; GPS_NB9; GPS_NBRef; ICE; Ice station; Latitude of event; Longitude of event; Nordenskiöldbreen, Svalbard; Standard deviation; Station label; Time coverage; Velocity magnitude
    Type: Dataset
    Format: text/tab-separated-values, 148 data points
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  • 2
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    (Table 4) GPS measured ice velocities at Nordenskiöldbreen glacier
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: average of all velocity values for a given period; DGPS; Differential global positioning system (DGPS); Elevation of event; Event label; GPS_NB1; GPS_NB2; GPS_NB4; GPS_NB5H; GPS_NB6; GPS_NB7; GPS_NB8; GPS_NB9; ICE; Ice station; Latitude of event; Longitude of event; Nordenskiöldbreen, Svalbard; Standard deviation; Station label; taking the distance between two (averaged) positions with the same time interval; Time coverage; Velocity magnitude
    Type: Dataset
    Format: text/tab-separated-values, 96 data points
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  • 3
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    Ice velocities of Nordenskiöldbreen glacier, Svalbard (2010)
    PANGAEA
    In:  Supplement to: den Ouden, M A G; Reijmer, Carleen H; Pohjola, Veijo A; van de Wal, Roderik S W; Oerlemans, Johannes; Boot, Wim (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
    Details
    Publication Date: 2023-12-13
    Description: 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.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Stand-alone single-frequency GPS ice velocity observations on Nordenskiöldbreen, Svalbard (2010)
    Copernicus
    Details
    Publication Date: 2010-07-14
    Description: Precise measurements of ice-flow velocities are necessary for a proper understanding of the dynamical response of glaciers to climate change. We use stand-alone single-frequency GPS receivers for this purpose. They are designed to operate unattended for multiple years, allowing uninterrupted measurements for long periods with a reasonable 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 in the NBRef data is explained by the atmospheric influence on the GPS signal and by the GPS satellite configuration. 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 (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 in combination with the relatively small distance (max. ±13 km) between the stations.
    Print ISSN: 1994-0432
    Electronic ISSN: 1994-0440
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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  • 5
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    Stand-alone single-frequency GPS ice velocity observations on Nordenskiöldbreen, Svalbard (2010)
    Copernicus
    Details
    Publication Date: 2010-12-15
    Description: 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−1 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−1) 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.
    Print ISSN: 1994-0416
    Electronic ISSN: 1994-0424
    Topics: Geography , Geosciences
    Published by Copernicus on behalf of European Geosciences Union.
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