SIMPLE-G Model Outputs

This dataset provides nitrogen leaching outputs from the SIMPLE-G Nitrogen (SGNv4.0) simulation framework under a targeted tax scenario. The scenario aims to reduce nitrogen leaching concentrations to a threshold of 2 mg N/L, consistent with planetary boundary guidance, while allowing for a maximum reduction of 90% in nitrogen application rates to avoid computations errors. The outputs reflect spatially explicit responses in agricultural systems and market dynamics under policy constraints, supporting integrated assessments of environmental and economic trade-offs in global food production.

• Simulation Version: SGNv4.0

• Scenario: Nitrogen Leaching Tax (2 mg N/L target)

• Simulation Completion Date: September 2025

Files

Solution files

The SL4 files store detailed solution results from a SIMPLE-G GEMPACK simulation, including both percentage changes and level values for all model variables that are not substituted out or omitted. 

sgn_v4p0_ntax90-lst1_e02.sl4

sgn_v4p0_ntax90-lst1_e05.sl4

sgn_v4p0_ntax90-lst1_e10.sl4

sgn_v4p0_ntax90-lst1_e25.sl4

Coefficients and parameters

The UDC files contain updated coefficient values generated during SIMPLE-G  GEMPACK simulations. These coefficients are updated given the model’s response to policy shocks or scenario changes, showing updated levels of variables such as prices, quantities, cost shares, and elasticities. 

sgn_v4p0_ntax90-lst1_e02.ucd

sgn_v4p0_ntax90-lst1_e05.ucd

sgn_v4p0_ntax90-lst1_e10.ucd

sgn_v4p0_ntax90-lst1_e25.ucd

How to read

You can explore and analyze this dataset using the GEMPACK or the HARr package in R, which provides tools for reading and manipulating economic model data created by GEMPACK. For R users, the HARr GitHub repository offers functions to import, inspect, and convert HAR files into tidy data frames.