Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability

被引：169

作者：

Barletta, Valentina R. ^{[1
,2
]}

Bevis, Michael ^{[2
]}

Smith, Benjamin E. ^{[3
]}

Wilson, Terry ^{[2
]}

Brown, Abel ^{[2
]}

Bordoni, Andrea ^{[4
]}

Willis, Michael ^{[5
]}

Khan, Shfaqat Abbas ^{[1
]}

Rovira-Navarro, Marc ^{[1
,6
]}

Dalziel, Ian ^{[7
]}

Smalley, Robert, Jr. ^{[8
]}

Kendrick, Eric ^{[2
]}

Konfal, Stephanie ^{[2
]}

Caccamise, Dana J., II ^{[2
]}

Aster, Richard C. ^{[9
]}

Nyblade, Andy ^{[10
]}

Wiens, Douglas A. ^{[11
]}

机构：

[1] Tech Univ Denmark, Natl Space Inst, Geodynam Dept, DTU Space, Lyngby, Denmark

[2] Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA

[3] Univ Washington, Seattle, WA 98195 USA

[4] Tech Univ Denmark, DTU Compute, Lyngby, Denmark

[5] Univ Colorado, Boulder, CO 80309 USA

[6] Delft Univ Technol, Delft, Netherlands

[7] Univ Texas Austin, Inst Geophys, Austin, TX USA

[8] Univ Memphis, Ctr Earthquake Res & Informat, Memphis, TN 38152 USA

[9] Colorado State Univ, Ft Collins, CO 80523 USA

[10] Penn State Univ, State Coll, PA USA

[11] Washington Univ, St Louis, MO USA

来源：

SCIENCE | 2018年 / 360卷 / 6395期

基金：

美国国家科学基金会;

关键词：

SOLID-EARTH RESPONSE; MARIE BYRD LAND; WEST ANTARCTICA; RADAR INTERFEROMETRY; PINE ISLAND; RETREAT; BENEATH; GREENLAND; BED;

D O I：

10.1126/science.aao1447

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The marine portion of the West Antarctic Ice Sheet (WAIS) in the Amundsen Sea Embayment (ASE) accounts for one-fourth of the cryospheric contribution to global sea-level rise and is vulnerable to catastrophic collapse. The bedrock response to ice mass loss, glacial isostatic adjustment (GIA), was thought to occur on a time scale of 10,000 years. We used new GPS measurements, which show a rapid (41 millimeters per year) uplift of the ASE, to estimate the viscosity of themantle underneath. We found amuch lower viscosity (4 x 10(18) pascal-second) than global average, and this shortens the GIA response time scale from tens to hundreds of years. Our finding requires an upward revision of ice mass loss from gravity data of 10% and increases the potential stability of the WAIS against catastrophic collapse.

引用

页码：1335 / +

页数：5

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