A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting

Lin, Yucheng; Hibbert, Fiona D.; Whitehouse, Pippa L.; Woodroffe, Sarah A.; Purcell, Anthony; Shennan, Ian; Bradley, Sarah

doi:10.1038/s41467-021-21990-y

Cited by 54 publications

(50 citation statements)

References 88 publications

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“…New evidence, comprising isolation basins, marine and terrestrial limiting dates, leads to an RSL curve for southern Skye which differs from all currently available GIA model predictions and provides a target for future research. The evidence for RSL at the time of MWP-1A shows no oscillation in RSL in contrast to several GIA models, adding support to the recent work of Lin et al (2021) that proposes a significant Fennoscandinavian contribution to MWP-1A.…”

Section: Discussionsupporting

confidence: 78%

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Local and regional constraints on relative sea‐level changes in southern Isle of Skye, Scotland, since the Last Glacial Maximum

Best

Simms

Brader

et al. 2021

J Quaternary Science

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New relative sea-level (RSL) data constrain the timing and magnitude of RSL changes in the southern Isle of Skye following the Last Glacial Maximum (LGM). We identify a marine limit at ~23 m OD, indicating RSL ~20 m above present c. 15.1 ka. Isolation basin data, supported by terrestrial and marine limiting dates, record an RSL fall to 11.59 m above present by c. 14.2 ka. This RSL fall occurs across the time of global Meltwater Pulse 1A, supporting recent research on the sources of ice melting. Our new data also help to resolve some of the chronological issues within the existing Isle of Skye RSL record and provide details of the sub-Arctic marine environment associated with the transition into Devensian Lateglacial climate at c. 14.5 k cal a BP, and the timing of changes in response to the Loch Lomond Stadial climate. Glacio-isostatic adjustment (GIA) model predictions of RSL deviate from the RSL constraints and reflect uncertainties in local and global ice models used within the GIA models. An empirical RSL curve provides a target for future research.

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Section: Discussionsupporting

confidence: 78%

“…1). The spatially variable pattern of GIA across Scotland also reflects the influence of the Fennoscandian Ice Sheet retreat in terms of both forebulge collapse and the gravitational effect on the global geoid (Lin et al, 2021;Peltier, 1998;Shennan et al 2018).…”

Section: Introduction and Aimsmentioning

confidence: 97%

Local and regional constraints on relative sea‐level changes in southern Isle of Skye, Scotland, since the Last Glacial Maximum

Best

Simms

Brader

et al. 2021

J Quaternary Science

Self Cite

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“…Although there is general consensus in regard to the GMSL curve for this time period, elements of the ice geometries continue to be revised. In particular, which ice sheets contributed to the global sea-level rise remains debated (e.g., Lambeck et al, 2014;Liu et al, 2016;Simms et al, 2019;Lin et al, 2021).…”

Section: Improvements To Gmsl and Ice Sheet Reconstructionsmentioning

confidence: 99%

Not a bathtub: A consideration of sea-level physics for archaeological models of human migration

Borreggine

Powell

Pico

et al. 2022

Journal of Archaeological Science

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Accurately reconstructing past sea level is key to simulating potential migration pathways of ancient hominins, including early Homo sapiens. Models of ancient human migration events commonly construct estimates of paleoenvironments using the "bathtub" model, in which sea level is assumed to rise and fall according to a "eustatic" (global average) value over time. However, large uncertainties exist on past ice sheet sizes and shapes, particularly prior to the Last Glacial Maximum (LGM), ~26,000 years ago. Moreover, regional sea level varies significantly due to the effects of glacial isostatic adjustment (GIA). That process includes Earth's gravitational, deformational, and rotational response to changing surface (ice plus ocean) loads across the ice age. Here, we offer an updated account of the physics of GIA-induced sea-level change and consider the impacts of these effects, together with a newly published ice sheet history, on sea-level changes across the last glacial cycle. As illustrations, we highlight the significance of these issues for studies of ancient human migration from Sunda to Sahul and for the timing of the final, post-LGM flooding of the Strait of Dover. These examples demonstrate the importance of incorporating updated ice sheet histories and accurate sea-level physics into archaeological research.

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“…The Gowan plastic ICESHEET model (Gowan et al ., 2016) was fitted to the BRITICE‐CHRONO and Scandinavian DATED (Hughes et al ., 2016) ice limits to provide mass loading estimates for use in northen hemispheric GIA modelling to better constrain relative sea level variations. These data have informed four of our transect papers (Ó Cofaigh et al ., 2021; Evans et al ., 2021; Scourse et al ., 2021; Benetti et al ., 2021), have been used in a GIA modelling investigation on fingerprinting of Meltwater Pulse 1A (Lin et al ., 2021), and used in a project forecasting 21st century sea levels around Britain and northwestern Europe, the UKCP18 Marine Report (Palmer et al ., 2018). The Parallel Ice Sheet Model (PISM, Winkelmann et al ., 2011) has been heavily used, in one case nudged towards fitting the BRITICE‐CHRONO ice limits and in another case with ensemble runs independent of them and then tested against them.…”

Section: A Data‐rich Environment To Improve Ice Sheet and Glacio‐isostatic Adjustment Modellingmentioning

confidence: 99%

Timing, pace and controls on ice sheet retreat: an introduction to the BRITICE‐CHRONO transect reconstructions of the British–Irish Ice Sheet

Clark

Chiverrell

Fabel

et al. 2021

J Quaternary Science

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Motivated to help improve the robustness of predictions of sea level rise, the BRITICE‐CHRONO project advanced knowledge of the former British–Irish Ice Sheet, from 31 to 15 ka, so that it can be used as a data‐rich environment to improve ice sheet modelling. The project comprised over 40 palaeoglaciologists, covering expertise in terrestrial and marine geology and geomorphology, geochronometric dating and the modelling of ice sheets and oceans. A systematic and directed campaign, organised across eight transects from the continental shelf edge to a short distance (10s of kilometres) onshore, was used to collect 914 samples which yielded 639 new ages, tripling the number of dated sites constraining the timing and rates of change of the collapsing ice sheet. This special issue synthesises these findings of ice advancing to the maximum extent and its subsequent retreat for each of the eight transects to produce definitive palaeogeographic reconstructions of ice margin positions across the marine to terrestrial transition. These results are used to understand the controls that drove or modulated ice sheet retreat. A further paper reports on how ice sheet modelling experiments and empirical data can be used in combination, and another probes the glaciological meaning of ice‐rafted debris.

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A reconciled solution of Meltwater Pulse 1A sources using sea-level fingerprinting

Cited by 54 publications

References 88 publications

Local and regional constraints on relative sea‐level changes in southern Isle of Skye, Scotland, since the Last Glacial Maximum

Local and regional constraints on relative sea‐level changes in southern Isle of Skye, Scotland, since the Last Glacial Maximum

Not a bathtub: A consideration of sea-level physics for archaeological models of human migration

Timing, pace and controls on ice sheet retreat: an introduction to the BRITICE‐CHRONO transect reconstructions of the British–Irish Ice Sheet

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