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Table II
Effects of homogenisation of climate time series: Mean error and r2 before and after homogenisation, with r2 = coefficient of determination between measured and interpolated daily climate values, MAE = mean absolute error, PMAE, percentage mean absolute error, d = mean difference before and after homogenisation, DTR = diurnal temperature range.
| Non-homogenised | Homogenised | |||||||
|
|
d | |||||||
| Variable | r 2 | MAE | PMAE | r 2 | MAE | PMAE | ||
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| Temperature | 0.98 | 1.0 | 12.0 | 0.99 | 0.9 | 10.3 | 0.03 | |
| Temperature (max.) | 0.98 | 1.1 | 8.5 | 0.99 | 1.0 | 7.8 | –0.07 | |
| Temperature (min.) | 0.95 | 1.5 | 38.0 | 0.96 | 1.5 | 38.1 | –0.02 | |
| DTR | 0.81 | 1.7 | 20.7 | 0.84 | 1.8 | 21.6 | ||
| Precipitation | 0.54 | 1.8 | 71.4 | 0.55 | 1.8 | 71.2 | –0.01 | |
| Rel. humidity | 0.76 | 6.1 | 7.5 | 0.85 | 5.5 | 6.9 | –0.54 | |
| Solar radiation | 0.88 | 23.7 | 21.7 | 0.93 | 18.6 | 16.5 | 4.6 | |
| Wind speed | 0.48 | 1.3 | 80.0 | 0.55 | 1.0 | 51.0 | 0.39 | |