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| Titel |
Monitoring of land-based glaciers on James Ross Island, Antarctic Peninsula |
| VerfasserIn |
Kamil Laska, Daniel Nývlt, Zbyněk Engel, Zdeněk Stachoň |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250105725
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| Publikation (Nr.) |
 EGU/EGU2015-8546.pdf |
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| Zusammenfassung |
| Antarctic Peninsula has been considered one of the most rapidly warming parts of our planet
during the second half of the 20th century. Therefore, James Ross Island located near the
northern tip of the Antarctic Peninsula, represents a unique place to study the sensitivity of
glacier systems to regional atmospheric warming. Since 2006, an integrated multidisciplinary
study of glaciers and terrestrial ecosystems has been carried out in the northern part of Ulu
Peninsula, James Ross Island. In this contribution, glacier monitoring network consisting of
four dominant land-based glaciers at the Ulu Peninsula is presented. Davies Dome (DD) is an
ice dome, which originates on the surface of a flat volcanic mesa at >400 m a.s.l. and
terminates as a single 700 m wide outlet in Whisky Bay. In 2006, Davies Dome
had an area of 6.5 km2 and lay in the altitude range 0-514 m a.s.l. Whisky Glacier
(WG) is a cold-based land-terminating valley glacier, which is surrounded by an
extensive area of debris-covered ice. WG covered an area of 2.4 km2 and ranged from
215 to 520 m a.s.l. Triangular Glacier (TG) is a southwest-facing land-terminating
glacier with an area of 0.6 km2 ranging from 302 to 107 m a.s.l. with well-developed
ice-cored terminal moraine. San Jose Glacier (SJG) is a south-facing land-terminating
piedmont glacier rejuvenated from the above lying Lachman Crags Dome (~640 m
a.s.l.). SJG covers an area of 0.6 km2 and extends between 138 and 310 m a.s.l.
Moreover, monitoring network consists of five automatic weather stations (AWS)
placed in the central and marginal parts of the selected glaciers. Each AWS was
equipped with the EMS33 air temperature and humidity probes placed inside the
radiation shields. Apart from that, additional instruments, e.g. albedometer, propeller
anemometer, snow depth sensors were installed on the central part of DD and WG.
Since 2009, annual mass balance measurements have been realized on the DD,
WG and TG glaciers. In 2010, ice thickness and glacier bed elevations of DD and
WG were surveyed using ground-penetrating radar. The results of glaciological
measurements over the period 2009-2014 reveal mostly positive annual mass balance on DD
and WG except for the glaciological year 2011-2012 when net accumulation was
recorded in the uppermost part of both glaciers. Spatial variability in annual mass
balance is larger on DD where snow distribution and net accumulation is strongly
determined by meteorological conditions. By contrast, interannual changes in spatial
pattern of net balance are reduced on WG due to the topographic control of snow
accumulation.
Acknowledgments: This research was supported by the project of Masaryk
University MUNI/A/0952/2013 and project LM2010009 CzechPolar (MSMT CR). |
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