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