Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate

Austermann, Jacqueline; Mitrovica, J. X.; Latychev, Konstantin; Milne, Glenn A.

doi:10.1038/ngeo1859

Cited by 160 publications

(122 citation statements)

References 29 publications

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“…The estimated total volume of ice inferred from the RSL data correlates well with the ice-sheet volume increase inferred from the benthic δ 18 O data (Lisiecki and Raymo, 2005). Both benthic δ 18 O records and surface glacial geological features show the −120 to −130 m relative sea-level low stand that was recorded by submerged fossil coral terraces at Barbados (Peltier and Fairbanks, 2006;Austermann et al, 2013), Tahiti (Bard et al, 1996(Bard et al, , 2010Deschamps et al, 2012) and Bonaparte Gulf (Yokoyama et al, 2000). The sea-level rise recorded at these far-field sites during the last ∼ 19 kyr following the melting of the LGM ice sheets is consistent with a decrease of benthic δ 18 O.…”

Section: Introductionsupporting

confidence: 51%

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A fully coupled 3-D ice-sheet–sea-level model: algorithm and applications

2014

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Abstract.Relative sea-level variations during the late Pleistocene can only be reconstructed with the knowledge of icesheet history. On the other hand, the knowledge of regional and global relative sea-level variations is necessary to learn about the changes in ice volume. Overcoming this problem of circularity demands a fully coupled system where ice sheets and sea level vary consistently in space and time and dynamically affect each other. Here we present results for the past 410 000 years (410 kyr) from the coupling of a set of 3-D ice-sheet-shelf models to a global sea-level model, which is based on the solution of the gravitationally selfconsistent sea-level equation. The sea-level model incorporates the glacial isostatic adjustment feedbacks for a Maxwell viscoelastic and rotating Earth model with coastal migration. Ice volume is computed with four 3-D ice-sheet-shelf models for North America, Eurasia, Greenland and Antarctica. Using an inverse approach, ice volume and temperature are derived from a benthic δ 18 O stacked record. The derived surface-air temperature anomaly is added to the present-day climatology to simulate glacial-interglacial changes in temperature and hence ice volume. The ice-sheet thickness variations are then forwarded to the sea-level model to compute the bedrock deformation, the change in sea-surface height and thus the relative sea-level change. The latter is then forwarded to the ice-sheet models. To quantify the impact of relative sea-level variations on ice-volume evolution, we have performed coupled and uncoupled simulations. The largest differences of ice-sheet thickness change occur at the edges of the ice sheets, where relative sea-level change significantly departs from the ocean-averaged sea-level variations.

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Section: Introductionsupporting

confidence: 51%

“…Whitehouse et al, 2012b), RSL over the glacial cycle (e.g. Deschamps et al, 2012;Grant et al, 2012;Austermann et al, 2013) and ice extent (e.g. Hughes et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

A fully coupled 3-D ice-sheet–sea-level model: algorithm and applications

2014

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“…For example, past ice thickness change is likely to be overestimated in regions where the local mantle viscosity is weaker than assumed by the model (Figure 5b). Similarly, global ice volumes may be incorrectly inferred if viscosity variations are ignored at far-field sea-level sites (Austermann et al, 2013). If the past ice history of a region has been independently determined then neglect of lateral variations in Earth structure will lead to bias in predictions of the GIA signal, and hence bias in estimates of contemporary ice sheet mass balance, potentially on the order 595 of 10's Gt/yr .…”

Section: Gia Models Traditionally Assume the Earth Behaves As A Lineamentioning

confidence: 99%

Glacial Isostatic Adjustment modelling: historical perspectives, recent advances, and future directions

Whitehouse¹

2018

Preprint

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Abstract. Glacial Isostatic Adjustment (GIA) describes the response of the solid Earth, the gravitational field, and 5 consequently the oceans to the growth and decay of the global ice sheets. It is a process that takes place relatively rapidly, triggering 100 m-scale changes in sea level and solid Earth deformation over just a few tens of thousands of years. Indeed, the first-order effects of GIA could already be quantified several hundred years ago without reliance on precise measurement techniques and scientists have been developing a unifying theory for the observations for over 200 years. Progress towards this goal required a number of significant breakthroughs to be made, including the recognition that ice sheets were once 10 more extensive, the solid Earth changes shape over time, and gravity plays a central role in determining the pattern of sealevel change. This article describes in detail the historical development of the field of GIA and an overview of the processes involved. Significant recent progress has been made as concepts associated with GIA have begun to be incorporated into parallel fields of research; these advances are discussed, along with the role that GIA is likely to play in addressing outstanding research questions within the field of Earth system modelling. 15

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“…(2013), which focused upon an attempt to infer 3D rheological Earth properties for Fennoscandia; and that of Austermann et al (2013), which focused upon the rebound process in the Caribbean. In the former, the authors found that the expanded parametric range of laterally varying Earth rheology could improve RSL fits of the ICE-5G (VM2) ice loading chronology of Peltier (2004).…”

Section: Constraining Ice Sheet Thickness and Palaeotopography Usingmentioning

confidence: 99%

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Stokes

Tarasov

Blomdin

et al. 2015

Quaternary Science Reviews

148

104

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Barbados-based estimate of ice volume at Last Glacial Maximum affected by subducted plate

Cited by 160 publications

References 29 publications

A fully coupled 3-D ice-sheet–sea-level model: algorithm and applications

A fully coupled 3-D ice-sheet–sea-level model: algorithm and applications

Glacial Isostatic Adjustment modelling: historical perspectives, recent advances, and future directions

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

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