Sea level
Mantle flow tilts Australia's last-interglacial shores
Open access · cc by · source: Europe PMC
Great Barrier Reef Last Interglacial corals sit metres below onshore beaches because the continent rose and the shelf sank, not because reefs weighed the crust down.
Study at a glance
- Design
- Computational / modelling — Compiled LIG reef/strandplain elevations with reef-isostasy, GIA, and dynamic-topography models
- N
- Queensland LIG elevation compilation plus Earth-model suite; not a single sample N
- Population
- Last Interglacial reef and strandplain elevations along the Great Barrier Reef / Queensland coast
- Outcome
- Relative sea-level tilt attributed mainly to dynamic topography rather than reef loading
Structured fields used in claim comparison tables when every cited study has a complete layer.
Key findings
Onshore LIG strandplains sit about +3 to +9 m while offshore LIG reefs are 5–20 m below modern sea level. Fine-resolution reef isostasy shifts relative sea level by at most 0.34 m (coarse loads 1.45 m). Dynamic topography can uplift the continent up to 10 m and subside the shelf 5–10 m since the LIG, dominating the tilt.
Methodology
The authors compiled Last Interglacial reef and strandplain elevations in Queensland, then modelled post-125 ka vertical motion from reef isostasy (1 km 3D vs coarse 1D loads), glacial isostatic adjustment, and 15 dynamic-topography Earth models.
Limitations
Dynamic-topography grids are ~200 km, too coarse to match local peaks. GIA ice histories remain uncertain. Strandplain ages are less precise than U-series reef dates. The study does not provide a new global mean LIG sea-level number.
How this study connects
Role on claims
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This library holds 3 empirical papers on sea level with measured outcomes rather than reviews.
Evidence for the claim as stated.
Great Barrier Reef Last Interglacial corals sit metres below onshore beaches because the continent rose and the shelf sank, not because reefs weighed the crust down.
Evidence for the claim as stated.
A reef isostasy study or a CMIP transient fingerprint is not a local flood map.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
A reef isostasy study or a CMIP transient fingerprint is not a local flood map.
Related papers in this topic
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