A modified viscous flow law for natural glacier ice: Scaling from laboratories to ice sheets.
Proc Natl Acad Sci U S A
; 121(23): e2309788121, 2024 Jun 04.
Article
em En
| MEDLINE
| ID: mdl-38814868
ABSTRACT
Glacier flow modulates sea level and is governed largely by the viscous deformation of ice. Multiple molecular-scale mechanisms facilitate viscous deformation, but it remains unclear how each contributes to glacier-scale deformation. Here, we present a model of ice deformation that bridges laboratory and glacier scales, unifies existing estimates of the viscous parameters, and provides a framework for estimating the parameters from observations and incorporating flow laws derived from laboratory observations into glacier-flow models. Our results yield a map of the dominant deformation mechanisms in the Antarctic Ice Sheet, showing that, contrary to long-standing assumptions, dislocation creep, characterized by a value of the stress exponent [Formula see text], likely dominates in all fast-flowing areas. This increase from the canonical value of [Formula see text] dramatically alters the climate conditions under which marine ice sheets may become unstable and drive rapid rates of sea-level rise.
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MEDLINE
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En
Ano de publicação:
2024
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Article