Re-establishment of ice-surface velocity field and snow surface elevation change around Dome Argus, East Antarctica
ABSTRACT In January 2016, static GPS measurements were carried out in a 30 × 30 km 2 area centered around Kunlun station at Dome Argus (Dome A), East Antarctica, to acquire high-precision 3-D geodetic coordinates at 49 sites. By comparing the coordinates with previous GPS measurements in 2008 and 20...
| Published in: | Annals of Glaciology |
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| Main Authors: | , , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
2019
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/aog.2019.3 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S026030551900003X |
| Summary: | ABSTRACT In January 2016, static GPS measurements were carried out in a 30 × 30 km 2 area centered around Kunlun station at Dome Argus (Dome A), East Antarctica, to acquire high-precision 3-D geodetic coordinates at 49 sites. By comparing the coordinates with previous GPS measurements in 2008 and 2013 at the same sites, we constructed a detailed and long-term record of the ice-surface velocity field, 2008–2016, around Dome A. During this time span, the estimated ice-surface velocity ranges from 0.8 ± 0.3 to 28.7 ± 1.6 cm a −1 , with a mean of 10.4 ± 0.3 cm a −1 . From 2013 to 2016, the surface elevation of most Dome A areas exhibits a rising trend, and the maximum increase of snow surface elevation is 84.8 cm. The mean snow surface elevation change rate at Dome A is estimated to be 6.6 ± 0.7 cm a −1 . The difference of 1.0 cm a −1 between the snow surface change rate derived from GPS and pole-height change rate from surface mass balance is suspected to be a result of a combination of firn densification and basal melt under Dome A. |
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