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The probable predictors for the current study were selected mainly based on the study by Timbal et al. (2009). Timbal et al. (2009) used the method of meteorological analogues to statistically downscale GCM outputs to daily precipitation, pan evaporation, minimum temperature, maximum temperature, and dew point temperature over six regions in the southern half of Australia. In that study, they identified the best predictors for each predictand for each season over the six regions. Since the current study area is also located in south eastern Australia, the predictors used in the study by Timbal et al. (2009) were included in the probable predictor pool of the current study. Some of the predictors used by Anandhi et al. (2008, 2009) in downscaling GCM outputs to monthly precipitation, minimum temperature and maximum temperature were also included in the pool of probable predictors used in the current study. The probable predictors which were selected for the present study based on past literature and hydrology are shown in Table 4.

Table 4

Probable predictors for precipitation, evaporation and temperature

Probable predictorLevelPrecipitationEvaporationTmin/max
Geopotential height 200 hPa ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
700 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Relative humidity 500 hPa ✓ ✓ ✓ 
700 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
925 hPa  ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Specific humidity 2 m height ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Air temperature 2 m height ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Skin temperature Surface ✓ ✓ ✓ 
Pressure Surface ✓ ✓ ✓ 
Mean sea level ✓ ✓ ✓ 
Precipitation rate Surface ✓ ✓  
Precipitable water N/A  ✓  
Zonal wind speed 850 hPa ✓ ✓ ✓ 
Meridional wind speed 850 hPa ✓ ✓ ✓ 
Probable predictorLevelPrecipitationEvaporationTmin/max
Geopotential height 200 hPa ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
700 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Relative humidity 500 hPa ✓ ✓ ✓ 
700 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
925 hPa  ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Specific humidity 2 m height ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Air temperature 2 m height ✓ ✓ ✓ 
500 hPa ✓ ✓ ✓ 
850 hPa ✓ ✓ ✓ 
1,000 hPa ✓ ✓ ✓ 
Skin temperature Surface ✓ ✓ ✓ 
Pressure Surface ✓ ✓ ✓ 
Mean sea level ✓ ✓ ✓ 
Precipitation rate Surface ✓ ✓  
Precipitable water N/A  ✓  
Zonal wind speed 850 hPa ✓ ✓ ✓ 
Meridional wind speed 850 hPa ✓ ✓ ✓ 

✓, included in the pool of probable predictors; N/A, not applicable; hPa, atmospheric pressure in hectopascal; Tmin/max, minimum temperature and maximum temperature.

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