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| Titel |
Response of glacier mass on recent temperature cooling in northeastern
Antarctic Peninsula |
| VerfasserIn |
Kamil Laska, Zbyněk Engel, Daniel Nývlt, Zdeněk Stachoň, Stefan Lippl, Matthias Braun |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250139374
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| Publikation (Nr.) |
 EGU/EGU2017-2601.pdf |
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| Zusammenfassung |
| The Antarctic Peninsula (AP) region has been often recognized as one of the most rapidly
warming parts of our planet during the second half of the 20th century (Turner and
others, 2014). However, recent study of Oliva and others (2016) has documented
that significant warming trend was shifted to a prominent cooling trend during
2006-2015. The recent cooling is particularly pronounced in the northeastern part of the
AP, with the largest temperature drops of 0.7–0.9 ˚ C between 1996–2005 and
2006–2015. Therefore, we aim to study response of small glaciers on James Ross Island,
north-eastern part of the AP, that are considered to be sensitive to recent temperature
fluctuations.
We have studied annual changes of mass balance and equilibrium line altitude of Whisky
Glacier, a cold-bases land-terminating valley glacier (∼2.4 km2), in the northern part of
James Ross Island. The surface mass balance changes were estimated based on
ablation stake measurements, carried out in late summer over the five years period
(2009/10–2013/14). In addition, glacier surface velocity and area changes were
determined for this period from aerial and satellite imageries based digital elevation
models.
Automatic weather stations in the northern part of James Ross Island reflect the recent
cold period and indicate a prominent cooling by 1.2 ˚ C over the period 2006–2015. A
response of glaciers on colder conditions can be observed throughout the area where negative
mass changes turned to predominantly positive values after 2009. The total mass of Whisky
Glacier has increased by 0.8 m w.e. in 2009/10–2013/14 and the annual mass changes
were positive except for 2011 (-0.1 m w.e.). A comparison of annual mass balance
changes with the data reported from glaciers on nearby Vega Island (Marinsek and
Ermolin, 2015) indicates similar values of glacier mass changes in northeastern
AP.
Acknowledgments: This research was supported by the Czech Science Foundation
(project GC 16-14122J) and Czech Ministry of Education (LM2015078). |
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