Observed crustal uplift near the Southern Patagonian Icefield constrains improved viscoelastic Earth model

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Abstract

Thirty‒one GPS geodetic measurements of crustal uplift in southernmost South America determined extraordinarily high trend rates (> 35 mm/yr) in the north‒central part of the Southern Patagonian Icefield. These trends have a coherent pattern, motivating a refined viscoelastic glacial isostatic adjustment model to explain the observations. Two end‒member models provide good fits: both require a lithospheric thickness of 36.5 ± 5.3 km. However, one end‒member has a mantle viscosity near η =1.6 ×1018 Pa s and an ice collapse rate from the Little Ice Age (LIA) maximum comparable to a lowest recent estimate of 1995–2012 ice loss at about −11 Gt/yr. In contrast, the other end‒member has much larger viscosity: η = 8.0 ×1018 Pa s, half the post–LIA collapse rate, and a steadily rising loss rate in the twentieth century after AD 1943, reaching −25.9 Gt/yr during 1995–2012.

Details

Original languageEnglish
Pages (from-to)805-812
JournalGeophysical Research Letters
Volume41
Issue number3
Publication statusPublished - 2014
Peer-reviewedYes

External IDs

Scopus 84896779997

Keywords

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Keywords

  • Patagonian ice field, crustal deformation, GNSS, Earth model