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We used NAO index data from the Climate Research Unit University of East Anglia (undated) and Osborn (undated) as these comprise a long and definitive record (Table 1). The longest data series of Scottish snow cover is from UK Met Office stations which record snow presence at a given point at 09:00 hours UTC each morning; the longest of these is Braemar which has recorded since 1927 (Harrison et al. 2001). Ninety-six per cent of UK Met Office snow recording stations lie below 300 m elevation (Spencer et al. 2014) and so are unrepresentative of the 31% of Scottish landmass that is higher (Spencer et al. 2014). These UK Met Office station data are used by proxy via the UK Climate Projections 2009 (UKCP09) snow cover data set (Met Office undated). Table 1 shows a non-definitive list of Scottish snow cover data sets, which are all used within this study.

Table 1

Study data sources

NameAbbreviationReferenceTypeTime span
Bonacina snowfall catalogue Bonacina O'Hara & Bonacina (undated)  Classification of snowiness of UK winter 1875 onwards 
UK Climate Projections 2009 snow lying grid UKCP09 Perry & Hollis (2005)  Interpolated grid of UK Met Office station data (days per month) 1971–2006 
MODIS satellite snow cover, daily L3 500 m grid v005 MODIS Hall et al. (2006)  Daily classified raster image 2000 onwards 
North Atlantic Oscillation Index NAO index Osborn (undated)  Single annual value (DJFM mean) 1821 onwards 
Snow Survey of Great Britain SSGB Spencer et al. (2014)  Daily observations of snowline elevation 1945–2007 
NameAbbreviationReferenceTypeTime span
Bonacina snowfall catalogue Bonacina O'Hara & Bonacina (undated)  Classification of snowiness of UK winter 1875 onwards 
UK Climate Projections 2009 snow lying grid UKCP09 Perry & Hollis (2005)  Interpolated grid of UK Met Office station data (days per month) 1971–2006 
MODIS satellite snow cover, daily L3 500 m grid v005 MODIS Hall et al. (2006)  Daily classified raster image 2000 onwards 
North Atlantic Oscillation Index NAO index Osborn (undated)  Single annual value (DJFM mean) 1821 onwards 
Snow Survey of Great Britain SSGB Spencer et al. (2014)  Daily observations of snowline elevation 1945–2007 

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