Multi-scale analysis

Model characteristics

  • Model name: MARINA-Nutrients
  • Version: China-3.0
  • Application: China
  • Scales: sub-basins, grid of 0.5˚, country and polygon (intersect of grid and county), annual
  • Period: 2012
  • Pollutants: dissolved inorganic (DIN, DIP), organic (DON, DOP) nitrogen and phosphorus
  • Sources: point (sewage) and diffuse (agriculture, natural areas)
  • Main inputs: agricultural activities, sewage systems, land use, hydrology
  • Main outputs: In-stream concentration of DIN, DON, DOP, and DIP, expressed in water quality classes

Modelling approach

Figure 1: Conceptual framework of the model application to China for multi-scale analysis (based on Chen et al., 2019, 2022)
Figure 1: Conceptual framework of the model application to China for multi-scale analysis (based on Chen et al., 2019, 2022)

Model outputs (example)

Figure 2: River export of dissolved inorganic nitrogen (kton/year). Modified from Chen et al., (2019; with CC-BY-NC-ND license)
Figure 2: River export of dissolved inorganic nitrogen (kton/year). Modified from Chen et al., (2019; with CC-BY-NC-ND license)