Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013
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- Xin Li
- Department of Earth System Science University of California Irvine California USA
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- Eric Rignot
- Department of Earth System Science University of California Irvine California USA
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- Mathieu Morlighem
- Department of Earth System Science University of California Irvine California USA
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- Jeremie Mouginot
- Department of Earth System Science University of California Irvine California USA
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- Bernd Scheuchl
- Department of Earth System Science University of California Irvine California USA
説明
<jats:title>Abstract</jats:title><jats:p>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.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 42 (19), 8049-8056, 2015-10-09
American Geophysical Union (AGU)
