Late Holocene coastal sand movements in the Outer Hebrides

S. Dawson, David Smith, J. Jordan, Alastair George Dawson

Research output: Contribution to journalArticle

35 Citations (Scopus)

Abstract

Lithostratigraphical and biostratigraphical investigation of coastal marshes along the Atlantic coast of the Outer Hebrides from Lewis in the north to Barra in the south discloses inland-tapering sand units within marshland areas. The inland extent of each sand unit has been radiometrically dated and the units have been collectively interpreted as a proxy for past coastal storminess. The data appear to indicate that for the study sites investigated, the majority of the sand units were produced during episodes of climate deterioration both prior to and after the well-known period of Medieval warmth (MWP). Many were produced after ca. AD 1400. It is argued that the episodes of sand blow indicated by the deposits may reflect periods of increased cyclogenesis in the Atlantic associated with increased sea ice cover and an increase in the thermal gradient across the North Atlantic region. (C) 2004 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)281-306
Number of pages25
JournalMarine Geology
Volume210
DOIs
Publication statusPublished - 2004

Keywords

  • machair
  • storminess
  • North Atlantic
  • Little Ice Age (LIA)
  • Medieval Warm Period (MWP)
  • Outer Hebrides
  • Scotland
  • NORTH-ATLANTIC
  • ATMOSPHERIC CIRCULATION
  • SEA-LEVEL
  • ICE-AGE
  • UISTS
  • ENVIRONMENTS
  • DEPOSITS
  • MACHAIR
  • IRELAND
  • DIATOMS

Cite this

Late Holocene coastal sand movements in the Outer Hebrides. / Dawson, S.; Smith, David; Jordan, J.; Dawson, Alastair George.

In: Marine Geology, Vol. 210, 2004, p. 281-306.

Research output: Contribution to journalArticle

Dawson, S. ; Smith, David ; Jordan, J. ; Dawson, Alastair George. / Late Holocene coastal sand movements in the Outer Hebrides. In: Marine Geology. 2004 ; Vol. 210. pp. 281-306.
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AB - Lithostratigraphical and biostratigraphical investigation of coastal marshes along the Atlantic coast of the Outer Hebrides from Lewis in the north to Barra in the south discloses inland-tapering sand units within marshland areas. The inland extent of each sand unit has been radiometrically dated and the units have been collectively interpreted as a proxy for past coastal storminess. The data appear to indicate that for the study sites investigated, the majority of the sand units were produced during episodes of climate deterioration both prior to and after the well-known period of Medieval warmth (MWP). Many were produced after ca. AD 1400. It is argued that the episodes of sand blow indicated by the deposits may reflect periods of increased cyclogenesis in the Atlantic associated with increased sea ice cover and an increase in the thermal gradient across the North Atlantic region. (C) 2004 Elsevier B.V. All rights reserved.

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