A new inference of mantle viscosity based upon joint inversion of convection and glacial isostatic adjustment data

Mitrovica, J. X.; Forte, A. M.

doi:10.1016/j.epsl.2004.06.005

Cited by 589 publications

(643 citation statements)

References 44 publications

Supporting

Mentioning

544

Contrasting

Order By: Relevance

“…The viscosity for diffusion creep (equation (1)) does not depend on the temperature difference across the boundary layer and therefore does not depend on whether the temperature difference driving small-scale convection is at its rheological threshold. Solutions for dry diffusion creep yield viscosities between 1.0 10 20 and 1.2 10 20 Pa s, close to the range of postglacial rebound estimates, 2.0 10 20 −5.3 10 20 Pa s [Cianetti et al, 2002;Mitrovica and Forte, 2004;Paulson et al, 2007]. Just below the lithosphere, viscosity should be slightly lower than such average values (see, e.g., the radial viscosity profile shown by Mitrovica and Forte [2004]), which is in agreement with our results.…”

Section: Overviewsupporting

confidence: 81%

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

Lévy

Jaupart

2011

J. Geophys. Res.

View full text Add to dashboard Cite

[1] We combine heat flux data and seismic velocity models for the North American lithosphere to derive constraints on thermal conditions and deformation mechanisms in the underlying convecting mantle. Local heat flux averages that are not affected by shallow crustal heat production contrasts allow calculation of reliable lithospheric geotherms and uncertainty ranges. For consistency with the seismic data, the mantle potential temperature beneath North America must lie within a 1290°C-1450°C range, close to that for the oceanic mantle sampled at mid-ocean ridges. The heat flux at the base of the lithosphere varies laterally from 11 ± 3 mW m −2 beneath the ∼250 km thick Archean core of the Superior province to 15 ± 3 mW m −2 beneath the thinner younger Appalachians province. It is shown that the most likely cause of such rates of heat supply into the North American continent is small-scale convection in an unstable boundary layer beneath the rigid mechanical lithosphere. This allows useful constraints on the mantle rheological properties. We show that the most likely deformation mechanism is dislocation creep in wet mantle rocks. Ranges for the mantle temperature, water content, and rheological parameters could be tightened very significantly once strong constraints are obtained on radiogenic heat production in the lithospheric mantle.Citation: Lévy, F., and C. Jaupart (2011), Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data,

show abstract

Section: Overviewsupporting

confidence: 81%

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

Lévy

Jaupart

2011

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…In a similar manner, the top frame indicates that good fits are obtained only for UMV values greater than 10 21 Pas for the chosen values of LMV and LT. These viscosity values are higher than those commonly estimated using near-field [e.g., Mitrovica and Forte, 2004] and far-field data [e.g., Lambeck et al, 2014]; however, they are compatible with a recent estimate based on RSL data from the circum-Caribbean region [Milne and Peros, 2013].…”

Section: Estimating Optimal Model Parameterscontrasting

confidence: 44%

The contribution of glacial isostatic adjustment to projections of sea‐level change along the Atlantic and Gulf coasts of North America

et al. 2016

View full text Add to dashboard Cite

We determine the contribution of glacial isostatic adjustment (GIA) to future relative sea-level change for the North American coastline between Newfoundland and Texas. We infer GIA model parameters using recently compiled and quality-assessed databases of past sea-level changes, including new databases for the United States Gulf Coast and Atlantic Canada. At 13 cities along this coastline, we estimate the GIA contribution to range from a few centimeters (e.g., 3 [−1 to 9] cm Miami) to a few decimeters (e.g., 18 [12][13][14][15][16][17][18][19][20][21][22] cm, Halifax) for the period 2085-2100 relative to 2006-2015 (1− ranges given). We provide estimates of uncertainty in the GIA component using two different methods; the more conservative approach produces total ranges (1− confidence) that vary from 3 to 16 cm for the cities considered. Contributions from ocean steric and dynamic changes as well as those from changes in land ice are also estimated to provide context for the GIA projections. When summing the contributions from all three processes at the 13 cities considered along this coastline, using median or best-estimate values, the GIA signal comprises 5-38% of the total depending on the adopted climate forcing and location. The contributions from ocean dynamic/steric changes and ice mass loss are similar in amplitude but with spatial variation that approximately cancels, resulting in GIA dominating the net spatial variability north of 35 ∘ N.

show abstract

“…The resulting ice history and viscosity structure are coupled, meaning that unrealistic GIA predictions might result from using those deglaciation models in combination with arbitrary viscosity profiles. However, large errors and trade-offs in the sea level records, unevenly distributed and difficult to date, cause large uncertainties in the resulting models and leave abundant room for independent improvements in both the ice history and the viscosity structure (e.g., Mitrovica and Forte 2004).…”

Section: Modelling Gia and Present-day Model Uncertaintymentioning

confidence: 99%

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

et al. 2010

View full text Add to dashboard Cite

The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is 123Surv Geophys (2010) 31:465-507 DOI 10.1007/s10712-010-9100-4 uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth's interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates.

show abstract

A new inference of mantle viscosity based upon joint inversion of convection and glacial isostatic adjustment data

Cited by 589 publications

References 44 publications

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

Temperature and rheological properties of the mantle beneath the North American craton from an analysis of heat flux and seismic data

The contribution of glacial isostatic adjustment to projections of sea‐level change along the Atlantic and Gulf coasts of North America

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

Contact Info

Product

Resources

About