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Using the same procedure used in developing downscaling models at key stations (see above under ‘Development of downscaling models at key stations’), a downscaling model was built for precipitation at member station 89003. This was performed to compare the performances of the inter-site regression relationship (between the key station 79046 and the member station 89003) against the performances of the downscaling model developed at this member station in reproducing the observed precipitation. Table 7 shows the statistics of precipitation reproduced by the downscaling models at station 89003, and also the statistics of precipitation reproduced at station 89003 by applying the precipitation outputs of the downscaling model developed at key station 79046 on the inter-site regression relationship. Note that both downscaling models at stations 89003 and 79046 were run with NCEP/NCAR reanalysis outputs as inputs, for this analysis.

Table 7

Statistics of precipitation reproduced at station 89003 by downscaling models and inter-site regression relationship

  Calibration (1950–1989)
Validation (1990–2010)
Season
Season
ModelStatisticSummerAutumnWinterSpringSummerAutumnWinterSpring
Observed Avg 28.5 47.9 73.6 57.2 28.4 31.9 66.5 48.9 
Model output 28.5 48.0 73.6 57.2 33.3 37.9 73.1 54.8 
Inter-station Reg 28.5 47.9 73.6 57.2 32.3 41.3 74.7 54.7 
Observed Std 23.8 34.1 33.4 31.4 20.4 21.7 31.3 27.5 
Model output 14.1 27.3 28.2 23.3 17.3 19.6 27.0 23.3 
Inter-station Reg 12.2 24.3 24.7 20.4 14.3 18.5 23.8 19.4 
Observed Min 0.0 0.0 5.7 4.4 0.0 0.0 10.0 3.2 
Model output 12.0 0.0 1.7 18.8 13.3 0.0 17.8 0.0 
Inter-station Reg 8.9 2.5 18.3 18.2 14.9 2.5 23.9 14.6 
Observed Max 143.7 136.8 182.9 184.0 85.8 90.7 147.7 125.2 
Model output 88.6 114.8 161.7 148.5 81.6 88.0 143.1 111.1 
Inter-station Reg 79.8 111.3 158.4 112.3 73.4 76.9 136.3 109.4 
Model output NSE 0.35 0.65 0.72 0.55 0.44 0.45 0.66 0.60 
Inter-station Reg 0.36 0.50 0.65 0.46 0.46 0.31 0.66 0.64 
  Calibration (1950–1989)
Validation (1990–2010)
Season
Season
ModelStatisticSummerAutumnWinterSpringSummerAutumnWinterSpring
Observed Avg 28.5 47.9 73.6 57.2 28.4 31.9 66.5 48.9 
Model output 28.5 48.0 73.6 57.2 33.3 37.9 73.1 54.8 
Inter-station Reg 28.5 47.9 73.6 57.2 32.3 41.3 74.7 54.7 
Observed Std 23.8 34.1 33.4 31.4 20.4 21.7 31.3 27.5 
Model output 14.1 27.3 28.2 23.3 17.3 19.6 27.0 23.3 
Inter-station Reg 12.2 24.3 24.7 20.4 14.3 18.5 23.8 19.4 
Observed Min 0.0 0.0 5.7 4.4 0.0 0.0 10.0 3.2 
Model output 12.0 0.0 1.7 18.8 13.3 0.0 17.8 0.0 
Inter-station Reg 8.9 2.5 18.3 18.2 14.9 2.5 23.9 14.6 
Observed Max 143.7 136.8 182.9 184.0 85.8 90.7 147.7 125.2 
Model output 88.6 114.8 161.7 148.5 81.6 88.0 143.1 111.1 
Inter-station Reg 79.8 111.3 158.4 112.3 73.4 76.9 136.3 109.4 
Model output NSE 0.35 0.65 0.72 0.55 0.44 0.45 0.66 0.60 
Inter-station Reg 0.36 0.50 0.65 0.46 0.46 0.31 0.66 0.64 

Avg, average of monthly precipitation in mm; Std, standard deviation of monthly precipitation in mm; Min, minimum of monthly precipitation in mm; Max, maximum of monthly precipitation in mm; NSE, Nash–Sutcliffe efficiency; Inter-station Reg, inter-station regression relationship.

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