Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013

Totten Glacier, East Antarctica, a glacier that holds a 3.9 m sea level change equivalent, has thinned and lost mass for decades. We map its grounding line positions in 1996 and 2013 using differential radar interferometry (InSAR) data and develop precise, high‐resolution topographies of its ice sur...

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Vydáno v:	Geophysical research letters Ročník 42; číslo 19; s. 8049 - 8056
Hlavní autoři:	Li, Xin, Rignot, Eric, Morlighem, Mathieu, Mouginot, Jeremie, Scheuchl, Bernd
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Washington Blackwell Publishing Ltd 16.10.2015 John Wiley & Sons, Inc
Témata:	Antarctica Asymmetry Climate change Conservation Data Glaciers glaciology Global warming Grounding grounding line Ice Instability Interferometric synthetic aperture radar Interferometry Marine Meteorology NASA Radar Radar data radar interferometry radar sounding remote sensing Sea level Sea level changes Stability Synthetic aperture radar interferometry Thinning Topography Antarctica PSW, Antarctica, West Antarctica PSE, Antarctica, East Antarctica
ISSN:	0094-8276, 1944-8007
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Popis
Shrnutí:	Totten Glacier, East Antarctica, a glacier that holds a 3.9 m sea level change equivalent, has thinned and lost mass for decades. We map its grounding line positions in 1996 and 2013 using differential radar interferometry (InSAR) data and develop precise, high‐resolution topographies of its ice surface and ice draft using NASA Operation IceBridge data, InSAR data, and a mass conservation method. We detect a 1 to 3 km retreat of the grounding line in 17 years. The retreat is asymmetrical along a two‐lobe pattern, where ice is only grounded a few 10 m above sea level, or ice plain, which may unground further with only modest amounts of ice thinning. The pattern of retreat indicates ice thinning of 12 m in 17 years or 0.7±0.1 m/yr at the grounding line on average. Sustained thinning will cause further grounding line retreat but may not be conducive to a marine instability. Key Points Grounding line of Totten Glacier is retreating, not as fast as West Antarctica Retreat pattern explained by the newly inferred bed geometry If ice thinning maintains, bed geometry conducive to further retreat
Bibliografie:	ark:/67375/WNG-BCN26DX8-S European Space Agency istex:096FEA7DC7E8C5CE248E7ACE799D16E4673D9833 Figures S1-S5, Table S1, and Text S1 German Aerospace Center (DLR) - No. XTI_GLAX0343 ArticleID:GRL53368 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0094-8276 1944-8007
DOI:	10.1002/2015GL065701