ORCHIDEE Development Section

Project CAMS41
Optimization of the relationship between CHTESSEL GPP and SIF data

PFT1 (Crops, mixed farming)
PFT2 (Short grass)
PFT3 (Evergreen needleleaf)
PFT4 (Deciduous needleleaf)
PFT5 (Deciduous broadleaf)
PFT6 (Evergreen broadleaf)
PFT7 (Tall grass)
PFT9 (Tundra)
PFT10 (Irrigated crops)
PFT11 (Semidesert)
PFT13 (Bogs and marshes)
PFT16 (Evergreen shrubs)
PFT17 (Deciduous shrubs)
PFT18 (Mixed forest - Wood)
PFT19 (Interrupted forest)

  1. Optimize \( (a,b) \) per CTESSEL PFT from the relationship
    \( SIF_\mathsf{SAT} = a \cdot GPP_\mathsf{Jung} + b \)
  2. Calculate inverse coefficients \( (\alpha,\beta) \)
    \( \alpha = \frac{1}{a} \)
    \( \beta = -\frac{b}{a} \)
  3. Compute CTESSEL SIF
    \( SIF_\mathsf{CTESSEL} = a \cdot GPP_\mathsf{CTESSEL} + b\)
  1. Compare SIF for CTESSEL vs GOME2
    \( \Delta SIF = SIF_\mathsf{SAT} - SIF_\mathsf{CTESSEL} \)
  2. Convert difference from SIF to GPP
    \( \Delta GPP_\mathsf{SAT} = \alpha \cdot \Delta SIF + \beta \)
  3. Compare with GPP difference
    \( \Delta GPP = GPP_\mathsf{Jung} - GPP_\mathsf{CTESSEL} \)

PFT map
CTESSEL vs GOME2 Koelher
CTESSEL vs GOME2 Joiner
CTESSEL vs GOSAT
CTESSEL vs GOME2 Koelher (annual maps)
CTESSEL vs GOME2 Koelher (monthly maps)