<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The study analyzes the changes in dynamics of the Jakobshavn Glacier in summer and winter in 2017 and 2021. Satellite radar observations and the available database were used for this. Moreover, the influence of the time baseline between SAR images on the quality of the results was also investigated. The velocities computed from Sentinel-1 images and the offset-tracking technique were compared with the MEaSUREs database information. The results showed that Jakobshavn Glacier accelerated in 2021 up to 39.0 m d<sup>−1</sup>. However, this value may be underestimated due to the resolution of Sentinel-1 data. The results therefore confirm the acceleration of the glacier melting process, which may be a result of the observed climate changes on our planet.</p></abstract>

The study analyzes the changes in dynamics of the Jakobshavn Glacier in summer and winter in 2017 and 2021. Satellite radar observations and the available database were used for this. Moreover, the influence of the time baseline between SAR images on the quality of the results was also investigated. The velocities computed from Sentinel-1 images and the offset-tracking technique were compared with the MEaSUREs database information. The results showed that Jakobshavn Glacier accelerated in 2021 up to 39.0 m d−1. However, this value may be underestimated due to the resolution of Sentinel-1 data. The results therefore confirm the acceleration of the glacier melting process, which may be a result of the observed climate changes on our planet.

Analysis of the Velocity Changes of the Jakobshavn Glacier Based on SAR Imagery

Department of Mining Areas Protection, Geoinformatics and Mining Surveying

Quaestiones Geographicae

This work is licensed under the Creative Commons Attribution 4.0 International License.

{"article-title":"Analysis of the Velocity Changes of the Jakobshavn Glacier Based on SAR Imagery"}

The study analyzes the changes in dynamics of the Jakobshavn Glacier in summer and winter in 2017 and 2021. Satellite radar observations and the available...

No.	Data of image acquisition	Orbit number	Time baseline [days]	Period
1	31.01.2017	127	16	Winter 2017
1	06.02.2017	127	16
2	31.01.2017	127	24
2	24.02.2017	127	24
3	30.07.2017	127	6	August 2017
3	05.08.2017	127	6
4	30.07.2017	127	30
4	29.08.2017	127	30
5	03.01.2021	25	6	Winter 2021
5	09.01.2021	25	6	Winter 2021
6	01.08.2021	25	6	August 2021
6	07.08.2021	25	6	August 2021

Parameters
DTM	ACE30
Grid size	20 × 20 pxl (200 × 200 m)
Searching window	128 × 128 pxl
Max velocity	40 m d⁻¹

Analysis of the Velocity Changes of the Jakobshavn Glacier Based on SAR Imagery

Published Online: Mar 19, 2022

Page range: 93 - 105

Received: Oct 14, 2021

DOI: https://doi.org/10.2478/quageo-2022-0007

Keywords
marine-terminating glacier, offset-tracking, SAR imagery, glacier surface velocity, temporal changes in dynamics

© 2022 Magdalena Łukosz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

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Description of data used in the study.

Parameters for the offset-tracking procedure.

Analysis of the Velocity Changes of the Jakobshavn Glacier Based on SAR Imagery

Published Online: Mar 19, 2022

Page range: 93 - 105

Received: Oct 14, 2021

DOI: https://doi.org/10.2478/quageo-2022-0007

Keywordsmarine-terminating glacier, offset-tracking, SAR imagery, glacier surface velocity, temporal changes in dynamics

© 2022 Magdalena Łukosz et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

Fig. 10

Fig. 11

Description of data used in the study.

Parameters for the offset-tracking procedure.

Keywords
marine-terminating glacier, offset-tracking, SAR imagery, glacier surface velocity, temporal changes in dynamics