Research Article
Trends in Dryness Index Based on Potential Evapotranspiration and Precipitation over 1961–2099 in Xinjiang, China
Table 4
The selected predictors used for developing a relationship between the predictand and predictor.
| Number | PR | NPP | NPE |
| 1 | Mean sea level pressure | 7 | 13 | 2 | Surface airflow strength | 2 | 3 | 3 | Surface zonal velocity | 5 | 9 | 4 | Surface meridional velocity | 12 | 6 | 5 | Surface velocity | 24 | 12 | 6 | Surface wind direction | 2 | 1 | 7 | Surface divergence | 10 | 1 | 8 | 500 hPa airflow strength | 10 | 1 | 9 | 500 hPa zonal velocity | 13 | 3 | 10 | 500 hPa meridional velocity | 19 | 7 | 11 | 500 hPa velocity | 24 | 1 | 12 | 500 hPa geopotential height | 29 | 20 | 13 | 500 hPa wind direction | 0 | 0 | 14 | 500 hPa divergence | 0 | 0 | 15 | 850 hPa airflow strength | 1 | 2 | 16 | 850 hPa zonal velocity | 9 | 10 | 17 | 850 hPa meridional velocity | 8 | 8 | 18 | 850 hPa velocity | 6 | 7 | 19 | 850 hPa geopotential height | 0 | 0 | 20 | 850 hPa wind direction | 0 | 0 | 21 | 850 hPa divergence | 0 | 0 | 22 | 500 hPa relative humidity | 17 | 5 | 23 | 850 hPa relative humidity | 17 | 14 | 24 | Near surface relative humidity | 8 | 8 | 25 | Surface specific humidity | 1 | 25 | 26 | Mean temperature at 2 m | 6 | 41 |
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PR: Predictor, NPP and NPE: numbers of stations used for establishing predictor-predictand relationship of rainfall and .
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