Detailed descriptions on the GSI models used in this study. The performance of the AGSI model was compared with that of other four existing models
| Model . | Key model equation . | Number of parameters . | Reference . |
|---|---|---|---|
| GSI0 | iGSI0 = iTmin × iVPD × iPhoto | 7 | Jolly et al. 2005 |
| HSGSI | iHSGSI = iTHS10 × | 9 | Hidy et al. 2012 |
| WGSI | iWGSI = iTmin × iVPD × iRad | 7 | Wang et al. 2013 |
| AMGSI | iAMGSI = iTmin × iPA × iPhoto × iRad × iSnow | 9 | Sun et al. 2018 |
| AGSI | iAGSI = iTmin × iTmax × iPA × iPhoto | 9 | This study |
| Model . | Key model equation . | Number of parameters . | Reference . |
|---|---|---|---|
| GSI0 | iGSI0 = iTmin × iVPD × iPhoto | 7 | Jolly et al. 2005 |
| HSGSI | iHSGSI = iTHS10 × | 9 | Hidy et al. 2012 |
| WGSI | iWGSI = iTmin × iVPD × iRad | 7 | Wang et al. 2013 |
| AMGSI | iAMGSI = iTmin × iPA × iPhoto × iRad × iSnow | 9 | Sun et al. 2018 |
| AGSI | iAGSI = iTmin × iTmax × iPA × iPhoto | 9 | This study |
Note: Tmin and Tmax are daily minimum and maximum air temperatures, respectively; VPD is mean daily vapor pressure deficit; Photo is daily photoperiod; HS10 is 10-day heatsum calculated as the sum of mean daily temperature−5 °C for each 10 day-long period; Rad is daylight mean global solar radiation; PA is the precipitation averaged over the previous month; Snow is a boolean index indicating whether there is snowfall based on mean daily temperature and precipitation data.
Detailed descriptions on the GSI models used in this study. The performance of the AGSI model was compared with that of other four existing models
| Model . | Key model equation . | Number of parameters . | Reference . |
|---|---|---|---|
| GSI0 | iGSI0 = iTmin × iVPD × iPhoto | 7 | Jolly et al. 2005 |
| HSGSI | iHSGSI = iTHS10 × | 9 | Hidy et al. 2012 |
| WGSI | iWGSI = iTmin × iVPD × iRad | 7 | Wang et al. 2013 |
| AMGSI | iAMGSI = iTmin × iPA × iPhoto × iRad × iSnow | 9 | Sun et al. 2018 |
| AGSI | iAGSI = iTmin × iTmax × iPA × iPhoto | 9 | This study |
| Model . | Key model equation . | Number of parameters . | Reference . |
|---|---|---|---|
| GSI0 | iGSI0 = iTmin × iVPD × iPhoto | 7 | Jolly et al. 2005 |
| HSGSI | iHSGSI = iTHS10 × | 9 | Hidy et al. 2012 |
| WGSI | iWGSI = iTmin × iVPD × iRad | 7 | Wang et al. 2013 |
| AMGSI | iAMGSI = iTmin × iPA × iPhoto × iRad × iSnow | 9 | Sun et al. 2018 |
| AGSI | iAGSI = iTmin × iTmax × iPA × iPhoto | 9 | This study |
Note: Tmin and Tmax are daily minimum and maximum air temperatures, respectively; VPD is mean daily vapor pressure deficit; Photo is daily photoperiod; HS10 is 10-day heatsum calculated as the sum of mean daily temperature−5 °C for each 10 day-long period; Rad is daylight mean global solar radiation; PA is the precipitation averaged over the previous month; Snow is a boolean index indicating whether there is snowfall based on mean daily temperature and precipitation data.
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