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The 1.5 km RCM is a climate version of the UK Met Office 1.5 km weather forecast model (UKV) (Kendon et al. 2012) but with a smaller domain, spanning southern England and Wales (Figure 1). The 1.5 km RCM lateral boundary conditions are supplied by the 12 km RCM, which is a limited-area (European domain) atmosphere-only version of the Met Office Hadley Centre Global Environmental Model. For the ERA-driven simulations, the 12 km RCM is driven at its lateral boundaries by the latest European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-Interim) (Dee et al. 2011) for the period 1989 to 2008. For the GCM-driven simulations the 12 km RCM uses boundary conditions from the HadGEM3 GCM, for Current and Future periods. Table 1 summarises the various RCM simulations available, including two versions of the GCM-driven runs with different aerosol formulations (see below). Kendon et al. (2012) found that it takes a few months for soil moisture to spin up in the 1.5 km RCM, therefore only data from January of the first full year of each run are included.
Table 1

Summary of 12 and 1.5 km RCM runs, with run IDs and time periods

 Run ID
  
RCM run12 km1.5 kmTime periodOther details
ERA-driven baseline ajtyr akigd April 1989 – November 2008  
GCM-driven Current (clim) alqtj alxmc May 1996 – November 2009 aerosol climatology 
GCM-driven Future (clim) alqtk alxme as above but for ∼2100s aerosol climatology, RCP 8.5 emissions 
GCM-driven Current (mod) alqtl alxmk May 1996 – November 2009 (12 km). June 1996 – March 2002 (1.5 km) aerosol modelling 
GCM-driven Future (mod) alqtm alxml as above but for ∼2100 s aerosol modelling, RCP 8.5 emissions 
 Run ID
  
RCM run12 km1.5 kmTime periodOther details
ERA-driven baseline ajtyr akigd April 1989 – November 2008  
GCM-driven Current (clim) alqtj alxmc May 1996 – November 2009 aerosol climatology 
GCM-driven Future (clim) alqtk alxme as above but for ∼2100s aerosol climatology, RCP 8.5 emissions 
GCM-driven Current (mod) alqtl alxmk May 1996 – November 2009 (12 km). June 1996 – March 2002 (1.5 km) aerosol modelling 
GCM-driven Future (mod) alqtm alxml as above but for ∼2100 s aerosol modelling, RCP 8.5 emissions 
Figure 1

Map showing the 1.5 km RCM domain (dotted line) and the locations of three MORECS sites used in the analysis (points).

Figure 1

Map showing the 1.5 km RCM domain (dotted line) and the locations of three MORECS sites used in the analysis (points).

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