Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21<sup>st</sup> century

doi:10.1029/2021GL093213

Totten Glacier (TG), the primary ice discharger of East Antarctica, contains 3.85 m sea level rise equivalent (SLRe) ice mass and has displayed ocean-driven dynamic change since at least the early 2000s. We project TG's evolution through 2100 in an asynchronously coupled ice-ocean model, forced at the ocean boundaries with anomalies in CMIP6 projected temperature, salinity, and velocity. Consistent with previous studies, the Antarctic Slope Current continues to modulate warm water inflow towards TG in future simulations. Warm water (-0.5 – $urn:x-wiley:00948276:media:grl62875:grl62875-math-0001$ C) accesses TG's sub-ice shelf cavity through depressions along the eastern ice front, driving sustained retreat of TG's eastern grounding zone that cannot be captured in uncoupled models. In high emission scenarios, warm water overcomes topographic barriers and dislodges TG's southern grounding zone around 2070, increasing the rate of grounded ice loss 3.5-fold (10 to 35 Gt/yr) and resulting in a total 4.20 mm SLRe loss by 2100.

DOI	10.1029/2021GL093213
	Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21^st century
	Tyler Pelle; Mathieu Morlighem; Yoshihiro Nakayama; Helene Seroussi
	2021-08-16
发表期刊	Geophysical Research Letters
出版年	2021
英文摘要	Totten Glacier (TG), the primary ice discharger of East Antarctica, contains 3.85 m sea level rise equivalent (SLRe) ice mass and has displayed ocean-driven dynamic change since at least the early 2000s. We project TG's evolution through 2100 in an asynchronously coupled ice-ocean model, forced at the ocean boundaries with anomalies in CMIP6 projected temperature, salinity, and velocity. Consistent with previous studies, the Antarctic Slope Current continues to modulate warm water inflow towards TG in future simulations. Warm water (-0.5 – $urn:x-wiley:00948276:media:grl62875:grl62875-math-0001$ C) accesses TG's sub-ice shelf cavity through depressions along the eastern ice front, driving sustained retreat of TG's eastern grounding zone that cannot be captured in uncoupled models. In high emission scenarios, warm water overcomes topographic barriers and dislodges TG's southern grounding zone around 2070, increasing the rate of grounded ice loss 3.5-fold (10 to 35 Gt/yr) and resulting in a total 4.20 mm SLRe loss by 2100.
领域	气候变化
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/335993
专题	气候变化
推荐引用方式 GB/T 7714	Tyler Pelle,Mathieu Morlighem,Yoshihiro Nakayama,et al. Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21^st century[J]. Geophysical Research Letters,2021.
APA	Tyler Pelle,Mathieu Morlighem,Yoshihiro Nakayama,&Helene Seroussi.(2021).Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21^st century.Geophysical Research Letters.
MLA	Tyler Pelle,et al."Widespread grounding line retreat of Totten Glacier, East Antarctica, over the 21^st century".Geophysical Research Letters (2021).

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