External nitrogen and phosphorus inputs to the ecosystem

External inputs of nutrient to the ecosystem can be either (1) read in from global maps, (2) prescribed from run.def (for site simulations) or (3) computed dynamically in case of biological nitrogen fixation (BNF) and phosphorus weathering. Several flags handle this.

List of external input fluxes currently considered

natural nitrogen input (g N m-2 yr-1)

• Ndep_NHX: atmospheric NHX deposition
• Ndep_NOY: atmospheric NOY deposition
• Nbnf: Biological N2 fixation

natural phosphorus input (g P m-2 yr-1)

• Pdep_p: atmospheric P deposition
• Pweat: P release from weathering