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

Valentina R. Barletta*, Michael Bevis, Benjamin E. Smith, Terry Wilson, Abel Brown, Andrea Bordoni, Michael Willis, Shfaqat Abbas Khan, Marc Rovira-Navarro, Ian Dalziel, Robert Smalley, Eric Kendrick, Stephanie Konfal, Dana J. Caccamise, Richard C. Aster, Andy Nyblade, Douglas A. Wiens

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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 the mantle underneath. We found a much lower viscosity (4 × 1018 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.
Original languageEnglish
JournalScience
Volume360
Issue number6395
Pages (from-to)1335-1339
ISSN0036-8075
DOIs
Publication statusPublished - 2018

Cite this

Barletta, Valentina R. ; Bevis, Michael ; Smith, Benjamin E. ; Wilson, Terry ; Brown, Abel ; Bordoni, Andrea ; Willis, Michael ; Khan, Shfaqat Abbas ; Rovira-Navarro, Marc ; Dalziel, Ian ; Smalley, Robert ; Kendrick, Eric ; Konfal, Stephanie ; Caccamise, Dana J. ; Aster, Richard C. ; Nyblade, Andy ; Wiens, Douglas A. / Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability. In: Science. 2018 ; Vol. 360, No. 6395. pp. 1335-1339.
@article{246996865f064efe9de7458bab776777,
title = "Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability",
abstract = "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 the mantle underneath. We found a much lower viscosity (4 × 1018 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.",
author = "Barletta, {Valentina R.} and Michael Bevis and Smith, {Benjamin E.} and Terry Wilson and Abel Brown and Andrea Bordoni and Michael Willis and Khan, {Shfaqat Abbas} and Marc Rovira-Navarro and Ian Dalziel and Robert Smalley and Eric Kendrick and Stephanie Konfal and Caccamise, {Dana J.} and Aster, {Richard C.} and Andy Nyblade and Wiens, {Douglas A.}",
year = "2018",
doi = "10.1126/science.aao1447",
language = "English",
volume = "360",
pages = "1335--1339",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6395",

}

Barletta, VR, Bevis, M, Smith, BE, Wilson, T, Brown, A, Bordoni, A, Willis, M, Khan, SA, Rovira-Navarro, M, Dalziel, I, Smalley, R, Kendrick, E, Konfal, S, Caccamise, DJ, Aster, RC, Nyblade, A & Wiens, DA 2018, 'Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability', Science, vol. 360, no. 6395, pp. 1335-1339. https://doi.org/10.1126/science.aao1447

Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability. / Barletta, Valentina R.; Bevis, Michael; Smith, Benjamin E.; Wilson, Terry; Brown, Abel; Bordoni, Andrea; Willis, Michael; Khan, Shfaqat Abbas; Rovira-Navarro, Marc; Dalziel, Ian; Smalley, Robert; Kendrick, Eric; Konfal, Stephanie; Caccamise, Dana J.; Aster, Richard C.; Nyblade, Andy; Wiens, Douglas A.

In: Science, Vol. 360, No. 6395, 2018, p. 1335-1339.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability

AU - Barletta, Valentina R.

AU - Bevis, Michael

AU - Smith, Benjamin E.

AU - Wilson, Terry

AU - Brown, Abel

AU - Bordoni, Andrea

AU - Willis, Michael

AU - Khan, Shfaqat Abbas

AU - Rovira-Navarro, Marc

AU - Dalziel, Ian

AU - Smalley, Robert

AU - Kendrick, Eric

AU - Konfal, Stephanie

AU - Caccamise, Dana J.

AU - Aster, Richard C.

AU - Nyblade, Andy

AU - Wiens, Douglas A.

PY - 2018

Y1 - 2018

N2 - 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 the mantle underneath. We found a much lower viscosity (4 × 1018 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.

AB - 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 the mantle underneath. We found a much lower viscosity (4 × 1018 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.

U2 - 10.1126/science.aao1447

DO - 10.1126/science.aao1447

M3 - Journal article

VL - 360

SP - 1335

EP - 1339

JO - Science

JF - Science

SN - 0036-8075

IS - 6395

ER -