title: Reconstructing pre-acidification pH for an acidified Scottish loch: a comparison of palaeolimnological and modelling approaches.
abstract: We reconstruct the pre-acidification pH of the Round Loch of Glenhead for 1800 AD using three diatom-pH transfer functions and a diatom-cladocera modern analogue technique (MAT), and compare these palaeo-data with hindcast data for the loch using the dynamic catchment acidification model MAGIC. We assess the accuracy of the transfer functions by comparing pH inferences from contemporary sediment and sediment trap diatom samples from the lake with measured pH from the UK Acid Waters Monitoring Network. The results from the transfer functions estimate the pH in 1800 to have been between 5.5. and 5.7, the MAT approach estimates pH at 5.8 and the MAGIC hindcast (for 1850) is pH 6.1. Whilst we have no independent method of assessing which of these values is most accurate, the disagreement between the two approaches indicates that further work is needed to resolve the discrepancies.
authors.affiliation: Environmental Change Research Centre, University College London, London WC1H 0AP, UK. rbattarb@geog.ucl.ac.uk
authors.forename: R W
authors.initials: RW
authors.lastname: Battarbee
authors.forename: D T
authors.initials: DT
authors.lastname: Monteith
authors.forename: S
authors.initials: S
authors.lastname: Juggins
authors.forename: C D
authors.initials: CD
authors.lastname: Evans
authors.forename: A
authors.initials: A
authors.lastname: Jenkins
authors.forename: G L
authors.initials: GL
authors.lastname: Simpson
mesh_terms: D015258:Acid Rain; D000818:Animals; D003247:Conservation of Natural Resources; D004784:Environmental Monitoring / Q000379:methods; D005580:Fossils; D005618:Fresh Water; D019015:Geologic Sediments / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008962:Models, Theoretical; D012606:Scotland
chemical_list: D015258:Acid Rain