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Ice-front variations and speed changes of calving glaciers in the Southern Patagonia Icefield from 1984 to 2011

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Title: Ice-front variations and speed changes of calving glaciers in the Southern Patagonia Icefield from 1984 to 2011
Authors: Sakakibara, Daiki Browse this author
Sugiyama, Shin Browse this author →KAKEN DB
Keywords: calving glacier
Patagonia
ice speed
Landsat
Issue Date: Nov-2014
Publisher: American Geophysical Union
Journal Title: Journal of geophysical research : earth surface
Volume: 119
Issue: 11
Start Page: 2541
End Page: 2554
Publisher DOI: 10.1002/2014JF003148
Abstract: Patagonian icefields are losing volume, and their loss is due partly to rapid changes in their outlet glaciers that terminate in lakes or the ocean. Despite this key influence from outlet glaciers, relatively few of these calving glaciers have had high-frequency measurements on their frontal variations and ice speed changes. We describe here recent frontal variations and ice speed changes of all 28 major calving glaciers in the Southern Patagonia Icefield (SPI), including ice speed maps covering approximately half of the entire icefield. The analysis is based on satellite data from 1984 to 2011. Over this period, only the two termini of Glaciar Pio XI advanced. Of the remaining glacial fronts, 12 changed less than 0.5km, but 17 retreated at least 0.5km. In the latter group, three glacial fronts (Glaciar Jorge Montt, HPS12, and Upsala) retreated over 6km. Averaged over all 31 glacial fronts of the calving glaciers, the front positions retreated 1.56km (median is 0.71km). Along the flowline within 20km of the front, the ice speeds up to 5900200ma(-1). Except for regions showing large acceleration or deceleration, the mean speed over the measured area decreased by 30ma(-1) from 1984 to 2011. The three most rapidly retreating glaciers showed much larger acceleration near the calving front, suggesting that ice dynamics drive their rapid retreat. Thus, we see retreat as a long-term trend for the calving glaciers in the SPI, with behavior that implies a dynamically controlled rapid recession that may explain the recently reported volume change of the SPI.
Rights: Copyright 2014 American Geophysical Union. All Rights Reserved.
Type: article
URI: http://hdl.handle.net/2115/59111
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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