气候变化领域集成服务门户(CCPortal): Viscous effects in the solid earth response to modern Antarctic ice mass flux: Implications for geodetic studies of WAIS stability in a warming world

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DOI	10.1175/JCLI-D-19-0479.1
	Viscous effects in the solid earth response to modern Antarctic ice mass flux: Implications for geodetic studies of WAIS stability in a warming world
	Powell E.; Gomez N.; Hay C.; Latychev K.; Mitrovica J.X.
发表日期	2020
ISSN	0894-8755
起始页码	443
结束页码	459
卷号	33 期号:2
英文摘要	The West Antarctic Ice Sheet (WAIS) overlies a thin, variable-thickness lithosphere and a shallow upper-mantle region of laterally varying and, in some regions, very low (;1018 Pa s) viscosity. We explore the extent to which viscous effects may affect predictions of present-day geoid and crustal deformation rates resulting from Antarctic ice mass flux over the last quarter century and project these calculations into the next half century, using viscoelastic Earth models of varying complexity. Peak deformation rates at the end of a 25-yr simulation predicted with an elastic model underestimate analogous predictions that are based on a 3D viscoelastic Earth model (with minimum viscosity below West Antarctica of 1018 Pa s) by;15 and;3 mm yr21 in the vertical and horizontal directions, respectively, at sites overlying low-viscosity mantle and close to high rates of ice mass flux. The discrepancy in uplift rate can be reduced by adopting 1D Earth models tuned to the regional average viscosity profile beneath West Antarctica. In the case of horizontal crustal rates, adopting 1D regional viscosity models is no more accurate in recovering predictions that are based on 3D viscosity models than calculations that assume a purely elastic Earth. The magnitude and relative contribution of viscous relaxation to crustal deformation rates will likely increase significantly in the next several decades, and the adoption of 3D viscoelastic Earth models in analyses of geodetic datasets [e.g., Global Navigation Satellite System (GNSS); Gravity Recovery and Climate Experiment (GRACE)] will be required to accurately estimate the magnitude of Antarctic modern ice mass flux in the progressively warming world. © 2019 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Climate models; Deformation; Earth (planet); Forecasting; Geodesy; Geodetic satellites; Global positioning system; Gravitation; Viscoelasticity; Viscosity; Viscous flow; Crustal deformations; Deformation rates; Global Navigation Satellite Systems; Gravity recovery and climate experiments; Relative contribution; Variable thickness; Viscous relaxation; West antarctic ice sheets; Ice; accuracy assessment; climate change; climate effect; complexity; crustal deformation; deformation mechanism; geodesy; GNSS; GRACE; ice cover; ice sheet; ice thickness; viscoelasticity; Antarctic Ice Sheet; Antarctica; West Antarctic Ice Sheet; West Antarctica
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171484
作者单位	Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth and Planetary Sciences, McGill University, Montreal, QC, Canada; Department of Earth and Environmental Sciences, Boston College, Chestnut Hill, MA, United States; Department of Earth and Environmental Sciences, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Powell E.,Gomez N.,Hay C.,et al. Viscous effects in the solid earth response to modern Antarctic ice mass flux: Implications for geodetic studies of WAIS stability in a warming world[J],2020,33(2).
APA	Powell E.,Gomez N.,Hay C.,Latychev K.,&Mitrovica J.X..(2020).Viscous effects in the solid earth response to modern Antarctic ice mass flux: Implications for geodetic studies of WAIS stability in a warming world.Journal of Climate,33(2).
MLA	Powell E.,et al."Viscous effects in the solid earth response to modern Antarctic ice mass flux: Implications for geodetic studies of WAIS stability in a warming world".Journal of Climate 33.2(2020).