Linking water age, nitrate export regime, and nitrate isotope biogeochemistry in a tile-drained agricultural field

This repository contains the SAS model input data and the model results that can be used to reproduce the water age results for the three study tiles presented in Yu et al. Linking water age, nitrate export regime, and nitrate isotope biogeochemistry in a tile-drained agricultural field <strong>File 1: SAS_model_input_TileX.csv</strong> The input data for the SAS model calibration for the three tiles. <strong>File 2: behavioral_parameter_sets_Model#1_TileX.csv</strong> The behavioral parameter sets obtained from the calibration of SAS model 1 (i.e., time-invariant kQ). <strong>File 3: behavioral_parameter_sets_Model#2_TileX.csv</strong> The behavioral parameter sets obtained from the calibration of SAS model 2 (i.e., time-variant kQ). <strong>File 4: Cl_simulation_results_Model#1_TileX.csv</strong> Simulated chloride concentration based on the optimal parameter set of SAS model 1 (i.e., time-invariant kQ). <strong>File 5: Cl_simulation_results_Model#2_TileX.csv </strong> Simulated chloride concentration based on the optimal parameter set of SAS model 2 (i.e., time-variant kQ). <strong>File 6: median_water_age_Model#1_TileX.csv</strong> Median water age of tile discharge based on the optimal parameter set of SAS model 1 (i.e., time-invariant kQ). <strong>File 7: median_water_age_Model#2_TileX.csv</strong> Median water age of tile discharge based on the optimal parameter set of SAS model 2 (i.e., time-variant kQ). <strong>File 8: File_column_names.txt</strong> A text file that explains the column names for each file