Calving Induced Speedup of Petermann Glacier
نویسندگان
چکیده
منابع مشابه
Dynamics of glacier calving at the ungrounded margin of Helheim Glacier, southeast Greenland
During summer 2013 we installed a network of 19 GPS nodes at the ungrounded margin of Helheim Glacier in southeast Greenland together with three cameras to study iceberg calving mechanisms. The network collected data at rates up to every 7 s and was designed to be robust to loss of nodes as the glacier calved. Data collection covered 55 days, and many nodes survived in locations right at the gl...
متن کاملStep-Wise Changes in Glacier Flow Speed Coincide With Calving and Glacial Earthquakes at Helheim Glacier, Greenland
[1] Geodetic observations show several large, sudden increases in flow speed at Helheim Glacier, one of Greenland’s largest outlet glaciers, during summer, 2007. These step-like accelerations, detected along the length of the glacier, coincide with teleseismically detected glacial earthquakes and major iceberg calving events. No coseismic offset in the position of the glacier surface is observe...
متن کاملFlotation and retreat of a lake-calving terminus, Mendenhall Glacier, southeast Alaska, USA
Mendenhall Glacier is a lake-calving glacier in southeastern Alaska, USA, that is experiencing substantial thinning and increasingly rapid recession. Long-term mass wastage linked to climatic trends is responsible for thinning of the lower glacier and leaving the terminus vulnerable to buoyancy-driven calving and accelerated retreat. Bedrock topography has played a major role in stabilizing the...
متن کاملIce sheets. Reverse glacier motion during iceberg calving and the cause of glacial earthquakes.
Nearly half of Greenland's mass loss occurs through iceberg calving, but the physical mechanisms operating during calving are poorly known and in situ observations are sparse. We show that calving at Greenland's Helheim Glacier causes a minutes-long reversal of the glacier's horizontal flow and a downward deflection of its terminus. The reverse motion results from the horizontal force caused by...
متن کاملGlacier, fjord, and seismic response to recent large calving events, Jakobshavn Isbræ, Greenland
[1] The recent loss of Jakobshavn Isbræ’s extensive floating ice tongue has been accompanied by a change in near terminus behavior. Calving currently occurs primarily in summer from a grounded terminus, involves the detachment and overturning of several icebergs within 30–60 min, and produces long-lasting and far-reaching ocean waves and seismic signals, including ‘‘glacial earthquakes’’. Calvi...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Earth Surface
سال: 2019
ISSN: 2169-9003
DOI: 10.1029/2018jf004775