Article Dans Une Revue Geomorphology Année : 2022

Relative Sea Level and Abrupt Mass Unloading in Barbados during the Holocene

Résumé

Relative sea level records climatic change as well as vertical land movement. In Barbados, uplift variation is necessary to interpret one of the most complete coral reef record. Here we show that an abrupt mass unloading of 30 ± 10 km3 caused an uplift variation of ~0.45 ± 0.15 mm/yr using a modelling approach. Simulations have been conducted for different volumes and elastic thicknesses. Isostatic adjustment in relation with an abrupt mass unloading explain the observed uplift rate increase from 0.34 mm/yr to 0.8 mm/yr that occurred 11.2 kyr ago. The reconstructed sea-level curve highlight a sea-level jump of 4.8 m, with a delay of 150 yr from the termination of Younger Dryas cold event and 300 yr before the abrupt mass unloading. This sea-level jump corresponds to meltwater pulse MWP-1B and is not an artefact. A stagnation of 500 yr occurred from 12 to 11.5 kyr BP. Relative sea level records are useful to detect past landslides and erosion. Accurate analysis and reconstruction of sea-level permit to determine sea-level abrupt rise caused by warming during the last thousand years.

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Dates et versions

hal-03723465 , version 1 (18-08-2022)

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Julien Gargani. Relative Sea Level and Abrupt Mass Unloading in Barbados during the Holocene. Geomorphology, 2022, 413, pp.108353. ⟨10.1016/j.geomorph.2022.108353⟩. ⟨hal-03723465⟩
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