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A spatially-restricted Younger Dryas plateau icefield in the Gaick, Scotland : Reconstruction and palaeoclimatic implications

Chandler, Benjamin M.P. ; Boston, Clare M. and Lukas, Sven LU (2019) In Quaternary Science Reviews 211. p.107-135
Abstract


Considerable research has been conducted in Scotland to reconstruct Younger Dryas glaciers and palaeoclimatic conditions, but our understanding remains incomplete. In this contribution, we examine the Gaick, a dissected plateau that extends over ∼520 km
2
in the Central Grampians, Scotland. The extent and style of Younger Dryas glaciation in the Gaick has been repeatedly contested, although a model of extensive plateau icefield glaciation has become generally accepted. This is despite well-documented issues with key elements of the plateau... (More)


Considerable research has been conducted in Scotland to reconstruct Younger Dryas glaciers and palaeoclimatic conditions, but our understanding remains incomplete. In this contribution, we examine the Gaick, a dissected plateau that extends over ∼520 km
2
in the Central Grampians, Scotland. The extent and style of Younger Dryas glaciation in the Gaick has been repeatedly contested, although a model of extensive plateau icefield glaciation has become generally accepted. This is despite well-documented issues with key elements of the plateau icefield reconstruction. We synthesise the results of recent geomorphological mapping in the Gaick and recognise a distinct morphostratigraphic signature in the upper parts of the western catchments. This differs markedly from sediment-landform associations in other parts of the area, and we argue this provides a strong indication of spatially-restricted Younger Dryas (∼12.9–11.7 ka) glaciation in the Gaick. Our interpretation is independently supported by glacierisation threshold analysis, which implies that the eastern Gaick was unable to nourish Younger Dryas ice. We therefore contest the accepted paradigm of extensive Younger Dryas glaciation in this area. Based on the geomorphological evidence and glacier surface profile modelling, we reconstruct a ∼42 km
2
plateau icefield that yields an equilibrium line altitude of 751 ± 46 m. Using this value, a sea-level precipitation value of 826 ± 331 mm a
−1
is inferred for the Younger Dryas, which suggests considerably drier conditions than at present. Using recalculated glacier-derived precipitation estimates from Scotland, we present regional climate analysis that corroborates arguments for a strong west-east precipitation gradient across Scotland.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Glacier reconstruction, Palaeoclimate, Plateau icefield, Scotland, Younger Dryas
in
Quaternary Science Reviews
volume
211
pages
29 pages
publisher
Elsevier
external identifiers
  • scopus:85063334635
ISSN
0277-3791
DOI
10.1016/j.quascirev.2019.03.019
language
English
LU publication?
yes
id
804fc88e-4955-4b2a-8831-8f053c28fe3a
date added to LUP
2019-04-01 14:36:29
date last changed
2022-04-25 22:03:38
@article{804fc88e-4955-4b2a-8831-8f053c28fe3a,
  abstract     = {{<p><br>
                                                         Considerable research has been conducted in Scotland to reconstruct Younger Dryas glaciers and palaeoclimatic conditions, but our understanding remains incomplete. In this contribution, we examine the Gaick, a dissected plateau that extends over ∼520 km                             <br>
                            <sup>2</sup><br>
                                                          in the Central Grampians, Scotland. The extent and style of Younger Dryas glaciation in the Gaick has been repeatedly contested, although a model of extensive plateau icefield glaciation has become generally accepted. This is despite well-documented issues with key elements of the plateau icefield reconstruction. We synthesise the results of recent geomorphological mapping in the Gaick and recognise a distinct morphostratigraphic signature in the upper parts of the western catchments. This differs markedly from sediment-landform associations in other parts of the area, and we argue this provides a strong indication of spatially-restricted Younger Dryas (∼12.9–11.7 ka) glaciation in the Gaick. Our interpretation is independently supported by glacierisation threshold analysis, which implies that the eastern Gaick was unable to nourish Younger Dryas ice. We therefore contest the accepted paradigm of extensive Younger Dryas glaciation in this area. Based on the geomorphological evidence and glacier surface profile modelling, we reconstruct a ∼42 km                             <br>
                            <sup>2</sup><br>
                                                          plateau icefield that yields an equilibrium line altitude of 751 ± 46 m. Using this value, a sea-level precipitation value of 826 ± 331 mm a                             <br>
                            <sup>−1</sup><br>
                                                          is inferred for the Younger Dryas, which suggests considerably drier conditions than at present. Using recalculated glacier-derived precipitation estimates from Scotland, we present regional climate analysis that corroborates arguments for a strong west-east precipitation gradient across Scotland.                         <br>
                        </p>}},
  author       = {{Chandler, Benjamin M.P. and Boston, Clare M. and Lukas, Sven}},
  issn         = {{0277-3791}},
  keywords     = {{Glacier reconstruction; Palaeoclimate; Plateau icefield; Scotland; Younger Dryas}},
  language     = {{eng}},
  pages        = {{107--135}},
  publisher    = {{Elsevier}},
  series       = {{Quaternary Science Reviews}},
  title        = {{A spatially-restricted Younger Dryas plateau icefield in the Gaick, Scotland : Reconstruction and palaeoclimatic implications}},
  url          = {{http://dx.doi.org/10.1016/j.quascirev.2019.03.019}},
  doi          = {{10.1016/j.quascirev.2019.03.019}},
  volume       = {{211}},
  year         = {{2019}},
}