NAM_ISBA_AGSn

NAM_ISBA_AGSn content

Fortran name	Fortran type	Default value
CNITRO_DILU	LOGICAL	‘NONE’
LDOWNREGU	LOGICAL	F
XCNLIM	REAL	-0.048

• CNITRO_DILU : this key activates a parameterization based on eq. 6 of Yin (2002) that modifies the leaf nitrogen content (CNA_NITRO), and hence the specific leaf area, according to the atmospheric CO$_{2}$ concentration.

  • ‘NONE’ : No nitrogen dilution (CNA_NITRO stays constant)

  • ‘CA08’ : Eq. 6 of Yin (2002) but simplified as described in Calvet et al, 2008

  • ‘ESM2’ : Eq. 6 of Yin (2002) and simplified as Calvet et al 2008 but taking into account the temperature term of eq 6. of Yin. When using CNITRO_DILU = ‘ESM2’, LDOWNREGU has to be set to TRUE.

• LDOWNREGU : downregulation parameterization of CO$_{2}$ assimilation for CPHOTO=NCB option. Change in light-use efficiency for carbon assimilation with elevated CO$_{2}$ concentration.

• XCNLIM : carbon nitrogen limitation parameter used in both the LNITRO_DILU and the LDOWNREGU options