High-resolution numerical simulation of Younger Dryas glaciation in Scotland

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dc.contributor.author Golledge, N.
dc.contributor.author Hubbard, A.
dc.contributor.author Sugden, D.
dc.date.accessioned 2011-05-31T12:15:53Z
dc.date.available 2011-05-31T12:15:53Z
dc.date.issued 2008-04-18
dc.identifier.citation Golledge , N , Hubbard , A & Sugden , D 2008 , ' High-resolution numerical simulation of Younger Dryas glaciation in Scotland ' Quaternary Science Review , vol 27 , no. 9-10 , pp. 888-904 . en
dc.identifier.issn 0277-3791
dc.identifier.other PURE: 162418
dc.identifier.other dspace: 2160/6828
dc.identifier.uri http://hdl.handle.net/2160/6828
dc.description Golledge, N.R., Hubbard, A., Sugden, D.E. (2008). High-resolution numerical simulation of Younger Dryas glaciation in Scotland. Quaternary Science Reviews 27(9-10), 888-904. Sponsorship: NERC en
dc.description.abstract We use a 500 m resolution three-dimensional thermomechanical ice-sheet model forced by a scaled GRIP temperature pattern to retrodict the extent of glaciers during the Younger Dryas episode in Scotland. Using empirical data from sources spanning half a century we systematically perturb temperature depression, precipitation distribution, and the amount of basal sliding to identify the parameter space that most closely reproduces the glacier margins identified from field investigations. Arithmetic comparison of predicted ice cover with empirical glacier extent enables mismatch to be quantified and an ‘optimum-fit’ timeslice to be identified. This ‘best-fit’ scenario occurs with a maximum mean annual temperature depression from present of View the MathML source and steep eastward and northward gradients imposed on a modern precipitation distribution, coupled with restricted basal sliding. Even small deviations around these values produce considerably less well-fitting glacier configurations, suggesting that only a narrow range of optimal parameterisation exists. Mismatch between modelled and empirically reconstructed glacier extents occurs as a consequence of local conditions not accommodated by the model, such as wind-blown snow accumulation and lake (loch) bathymetry, and where geological evidence is equivocal. At the domain scale, however, our simulation suggests that inception of Scottish glaciers occurs rapidly, and leads to a coherent ice cap within 400 years of initial climatic cooling. According to our model, the ice cap begins to decay relatively early in the stadial, probably as a result of increasing aridity leading to net thinning and recession of many of its margins, with final and catastrophic collapse of the ice cap occurring largely within a century. en
dc.format.extent 17 en
dc.language.iso eng
dc.relation.ispartof Quaternary Science Review en
dc.title High-resolution numerical simulation of Younger Dryas glaciation in Scotland en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.quascirev.2008.01.019
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Centre for Glaciology en
dc.description.status Peer reviewed en


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