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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ftcdlib:oai:escholarship.org:ark:/13030/qt1t97c3tc 2023-05-15T14:13:24+02:00 Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 Li, X Rignot, E Morlighem, M Mouginot, J Scheuchl, B 8049 - 8056 2015-10-16 application/pdf https://escholarship.org/uc/item/1t97c3tc unknown eScholarship, University of California qt1t97c3tc https://escholarship.org/uc/item/1t97c3tc public Geophysical Research Letters, vol 42, iss 19 Meteorology & Atmospheric Sciences article 2015 ftcdlib 2023-03-13T18:50:54Z 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 Article in Journal/Newspaper Antarc* Antarctica East Antarctica Totten Glacier West Antarctica University of California: eScholarship East Antarctica Totten Glacier ENVELOPE(116.333,116.333,-66.833,-66.833) West Antarctica |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Meteorology & Atmospheric Sciences |
spellingShingle |
Meteorology & Atmospheric Sciences Li, X Rignot, E Morlighem, M Mouginot, J Scheuchl, B Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
topic_facet |
Meteorology & Atmospheric Sciences |
description |
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 |
format |
Article in Journal/Newspaper |
author |
Li, X Rignot, E Morlighem, M Mouginot, J Scheuchl, B |
author_facet |
Li, X Rignot, E Morlighem, M Mouginot, J Scheuchl, B |
author_sort |
Li, X |
title |
Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
title_short |
Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
title_full |
Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
title_fullStr |
Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
title_full_unstemmed |
Grounding line retreat of Totten Glacier, East Antarctica, 1996 to 2013 |
title_sort |
grounding line retreat of totten glacier, east antarctica, 1996 to 2013 |
publisher |
eScholarship, University of California |
publishDate |
2015 |
url |
https://escholarship.org/uc/item/1t97c3tc |
op_coverage |
8049 - 8056 |
long_lat |
ENVELOPE(116.333,116.333,-66.833,-66.833) |
geographic |
East Antarctica Totten Glacier West Antarctica |
geographic_facet |
East Antarctica Totten Glacier West Antarctica |
genre |
Antarc* Antarctica East Antarctica Totten Glacier West Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica Totten Glacier West Antarctica |
op_source |
Geophysical Research Letters, vol 42, iss 19 |
op_relation |
qt1t97c3tc https://escholarship.org/uc/item/1t97c3tc |
op_rights |
public |
_version_ |
1766285842236571648 |