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A 16 000-year record of near-field relative sea-level changes, northwest Scotland, United Kingdom
Shennan, I.; Hamilton, S.; Hillier, C.; Woodroffe, S. (2005). A 16 000-year record of near-field relative sea-level changes, northwest Scotland, United Kingdom. Quaternary International 133-134: 95-106. http://dx.doi.org/10.1016/j.quaint.2004.10.015
In: Quaternary International. Elsevier: Oxford. ISSN 1040-6182; e-ISSN 1873-4553
Peer reviewed article  
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  • Shennan, I.
  • Hamilton, S.
  • Hillier, C.
  • Woodroffe, S.
Abstract
    Isolation basins, raised tidal marshes, coastal wetlands and dune systems around Arisaig in northwest Scotland produce a ~16 000-year record of relative sea-level (RSL) change from the time of local deglaciation following the Last Glacial Maximum (LGM) to the present. New sea-level index points from Mointeach Mhor North define the culmination of the mid-Holocene RSL highstand to ~7600–7400 cal yr BP and 6.74±0.2 m above present. Numerous sea-level index points indicate that the RSL highstand persisted more than 1000 years before the onset of any significant RSL fall. This points to a gradual cessation of melting of the Laurentide and Antarctic ice sheets, rather than an abrupt termination. Isolation basin evidence, from a marine limit ~34 to 38 m above present down to sites close to current sea level, constrain the acceleration of eustatic sea-level rise during meltwater pulse 1a to ~30 mm yr-1 or ~11 km3 yr-1 meltwater discharge. Comparison of RSL observations with glacial isostatic adjustment (GIA) model predictions show differences in the pattern of residuals dependent upon the GIA model used. Changes to the far-field ice model components can partly explain the patterns of residuals.
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