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Millennial-length forward models and pseudoproxies of stalagmite d18O: an example from NW Scotland

Citation

Baker, A and Bradley, C and Phipps, SJ and Fischer, M and Fairchild, IJ and Fuller, L and Spotl, C and Azcurra, C, Millennial-length forward models and pseudoproxies of stalagmite d18O: an example from NW Scotland, Climate of the Past, 8 pp. 1153-1167. ISSN 1814-9324 (2012) [Refereed Article]


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Copyright 2012 The Authors Licensed under Creative Commons Attribution 3.0 Unported http://creativecommons.org/licenses/by/3.0/legalcode

DOI: doi:10.5194/cp-8-1153-2012

Abstract

The stable oxygen isotope parameter δ18O remains the most widely utilised speleothem proxy for past climate reconstructions. Uncertainty can be introduced into stalagmite δ18O from a number of factors, one of which is the heterogeneity of groundwater flow in karstified aquifers. Here, we present a lumped parameter hydrological model, KarstFor, which is capable of generating monthly simulations of surface water ground water stalagmite δ18O for more than thousand-year time periods. Using a variety of climate input series, we use this model for the first time to compare observational with modelled (pseudoproxy) stalagmite δ18O series for a site at Assynt, NW Scotland, where our knowledge of δ18O systematics is relatively well understood. The use of forward modelling allows us to quantify the relative contributions of climate, peat and karst hydrology, and disequilibrium effects in stalagmite δ18O, from which we can identify potential stalagmite δ18O responses to climate variability. Comparison of the modelled and actual stalagmite δ18O for two stalagmites from the site demonstrates that, for the period of overlapping growth, the two series do not correlate with one another, but forward modelling demonstrates that this falls within the range explicable by differences in flow routing to the stalagmites. Pseudoproxy δ18O stalagmite series highlight the potential significance of peat hydrology in controlling stalagmite δ18O over the last 1000 yr at this site.

Item Details

Item Type:Refereed Article
Keywords:forward models, palaeoclimate, stalagmites, isotopes, Scotland
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Palaeoclimatology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Models
Author:Phipps, SJ (Dr Steven Phipps)
ID Code:104716
Year Published:2012
Web of Science® Times Cited:23
Deposited By:IMAS Research and Education Centre
Deposited On:2015-11-18
Last Modified:2017-10-30
Downloads:36 View Download Statistics

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