# Impact of Climate Change on the Major Eco-Hydrological Parameters in the Dongting Lake Basin
## 2 Materials and Methods
### Data Preparation  
In the present study, 47 meteorological data sites within the Dongting Lake Basin were selected (Figure 2). The percentage of different land cover types in the Dongting Lake Basin and its sub-basins is shown in Figure 3. Data were obtained from The National Meteorological Scientific Data Sharing Service Platform ([[http://data.cma.cn](http://data.cma.cn)]([http://data.cma.cn](http://data.cma.cn)), accessed on 10 March 2022). The data used included daily-scale temperature, precipitation, site barometric pressure, relative humidity, wind direction and speed, and short-wave radiation at the sites. Temperature and precipitation data can be used to calculate extreme climate events using RClimDex ([[https://github.com/ECCC-CDAS/RClimDex](https://github.com/ECCC-CDAS/RClimDex)]([https://github.com/ECCC-CDAS/RClimDex](https://github.com/ECCC-CDAS/RClimDex)), accessed on 16 July 2023). Figure 1: Location of the Dongting Lake Basin in China. The BESS model was driven by infrared radiation data, air temperature, pressure, wind speed, albedo, land cover type, leaf area index, CI, fC4, canopy height, ambient CO\({}_{2}\) concentration, and leaf carbonyl. To operate, the BESS model needed land cover type, and leaf area index data from MODIS remote sensing products ([[https://ladsweb.nascom.nasa.gov/search](https://ladsweb.nascom.nasa.gov/search)]([https://ladsweb.nascom.nasa.gov/search](https://ladsweb.nascom.nasa.gov/search)), accessed on 11 March 2022). Albedo data were obtained from GLASS ([[http://geodata.cn](http://geodata.cn)]([http://geodata.cn](http://geodata.cn)), accessed on 11 March 2022). CI, fC4, canopy height, ambient CO\({}_{2}\) concentration, and leaf carbonyl were driven by data from [PERSON]'s study [17]. The specific input data is presented in Table 1.  
Figure 2: Landcover and location of 47 meteorological sites in the Dongting Lake Basin. \begin{table}
\begin{tabular}{c c c c c} \hline
**Data Type** & **Code** & **Name** & **Data Sources** & **Time Scale** \\ \hline \multirow{8}{*}{Meteorological data} & Ps & surface pressure & & day \\  & Ts & surface temperature & Ground-based meteorological & day \\  & Ta & atmospheric & observation station data sets & \\  & Ta & temperature & ([[http://data.cma.cn](http://data.cma.cn)]([http://data.cma.cn](http://data.cma.cn)), accessed & day \\  & Td & atmospheric pressure & on 20 March 2022) & day \\  & LST & land surface & & day \\  & Ws & temperature & & day \\ \hline \multirow{8}{*}{Remote sensing data} & \multirow{2}{*}{PARDir} & direct & Ecological Sensing Al Lab & \\  & & photosynthetically & ([[https://www.environment](https://www.environment)]([https://www.environment](https://www.environment)). & \\  & & active radiation & & snu.ac.kr/bess-rad, accessed & 8 days \\  & & diffuse & & ([[https://www.environment](https://www.environment)]([https://www.environment](https://www.environment)). & \\  & & photosynthetically & & ([[https://www.environment](https://www.environment)]([https://www.environment](https://www.environment)). & \\  & & active radiation & & snu.ac.kr/bess-rad, accessed & 8 days \\  & & direct near-infrared & & ([[https://www.environment](https://www.environment)]([https://www.environment](https://www.environment)). & \\  & & radiation & snu.ac.kr/bess-rad, accessed & 8 days \\  & & radiation & snu.ac.kr/bess-rad, accessed & 8 days \\  & & & on 20 March 2022) & \\  & & & Ecological Sensing Al Lab & \\  & & diffuse near-infrared & ([[https://www.environment](https://www.environment)]([https://www.environment](https://www.environment)). & \\  & & radiation & snu.ac.kr/bess-rad, accessed & 8 days \\  & & & on 20 March 2022) & \\ \end{tabular}
\end{table} 
Table 1: Introduction to BESS model input data. Figure 3: Percentage of different land cover types in the Dongting Lake Basin and sub-basins. The BESS model uses an atmospheric light environment simulator that allows the simulation of direct and diffuse radiation in the photosynthetically active radiate on (PAR) and near-infrared (NIR) spectral domains.