Observed crustal uplift near the Southern Patagonian Icefield constrains improved viscoelastic Earth models
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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.
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GNSS-measured data show ongoing vertical rock uplift rates between 18 ± 3 and 41 ± 3 mm yr−1 in the northern part (18-50.5°S) of the SPI, decreasing to values between 2 ± 6 and 17 ± 5 mm yr−1 in its southern part (50.5-51.5°S).
“GNSS-measured data show ongoing vertical rock uplift rates between 18 ± 3 and 41 ± 3 mm yr -1 in the northern part (18-50.5°S) of the SPI (Fig. 1b), decreasing to val-ues between 2 ± 6 and 17 ± 5 mm yr -1 in its southern part (50.5-51.5°S) (Ivins and James, 2004;Dietrich et al., 2010;Lange et al., 2014;Richter et al., 2016;Lenzano et al., 2023).”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Lange et al., 2014
The rheologic and thermal structure of the reference model gives a lithospheric elastic thickness, Te, of ∼30 km, comparable to previous estimates underneath the SPI.
“The rheologic and thermal structure of the reference model gives a lithospheric elastic thickness, T e (sensu Burov and Diament, 1995), of ∼ 30 km, comparable to previous estimates underneath the SPI based on GIA models (Ivins and James, 1999;Dietrich et al., 2010;Lange et al., 2014), heat flow data (Ávila and Dávila, 2018), waveform inversion (Robertson Maurice et al., 2003), and low-temperature”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Lange et al., 2014
A longer-term contribution from the viscous lithosphere is necessary to explain the GNSS-measured uplift rates.
“a longer-term contribution from the viscous lithosphere is necessary to explain the GNSS-measured uplift rates”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Lange et al., 2014
In the southern Patagonian Andes, GIA models estimated the regional asthenosphere viscosity to be between 1.6 and 8 × 10^18 Pa s.
“In the southern Patagonian Andes, GIA models estimated the regional asthenosphere viscosity to be between 1.6 and 8 × 10 18 Pa s”
From Fast uplift in the southern Patagonian Andes due to long- and short-term deglaciation and the asthenospheric window underneath (2024) · cites this paper as Lange et al., 2014
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References 35 · Cited by 57
- Authors
- Lange, H., Casassa, G., Ivins, E. R., Schröder, L., Fritsche, M., Richter, A., Groh, A., & Dietrich, R.
- Affiliations
- Technische Universität Dresden (DE)
- Formerly at Centro de Estudios Científicos Valdivia Chile
- Jet Propulsion Laboratory (US)
- Corresponding author
- Lange, H.
- Venue
- Geophysical Research Letters
- Publisher
- American Geophysical Union (AGU)
- Published
- 2014-02-05
- Volume
- 41
- Issue
- 3
- Pages
- 805-812
- ISSN
- 0094-8276 (ISSN-L)
- 1944-8007
- OpenAlex
- W1529443146
- Cited by
- 57
- References
- 35
- Citations by year
- 2026: 6 · 2025: 6 · 2024: 5 · 2023: 11 · 2022: 2 · 2021: 8 · 2020: 8 · 2019: 4 · 2018: 2 · 2016: 2 · 2015: 1 · 2014: 2
- FWCI
- 1.11
- Type
- journal article
- Language
- en
- Open access
- green
- americanae.aecid.es
- Licence
- Locations
- Geophysical Research Letters (publishedVersion)
- Americanae (AECID Library) (submittedVersion, other-oa)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, other-oa)
- Funders
- National Aeronautics and Space Administration
- Deutsche Forschungsgemeinschaft
- Comisión Nacional de Investigación Científica y Tecnológica
- Topics
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Cryospheric studies and observations
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Geophysics and Gravity Measurements
- Physical Sciences › Earth and Planetary Sciences › Geophysics › earthquake and tectonic studies
- Keywords
- crustal uplift, Southern Patagonian Icefield, glacial isostatic adjustment, viscoelastic Earth model, mantle viscosity, lithospheric thickness, ice mass loss, Little Ice Age, GPS geodesy
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