Questions about the fraction of chlorophyll-absorbed energy allocated to PSII (β2)

[qmj0205]

Dear SCOPE developers,

I'm using SCOPE v1.73 to implement a split simulation of PSI and PSII fluorescence. However, I have some problems in changing the parameter of the fraction of chlorophyll-absorbed energy allocated to PSII (β2).

1. Where should I set the β2 parameter?

2. I think the factor 0.5 is used in the formulas for calculating the forward (Mf) and backward (Mb) scattering fluorescence matrices in fluspect_B_CX.m because the forward and backward scattering fluorescence are equal, so each is taken as 1/2. How should I understand the comment ("Other factor .5 deleted, since these are the complete efficiencies for either PSI or PSII, not a linear combination") in front of the formulas? What is the coefficient of 0.5 that was deleted, and is the β2 parameter reflected in these two formulas?
   % Other factor .5 deleted, since these are the complete efficiencies for either PSI or PSII, not a linear combination [MfI, MbI] = deal(fqe(1) * ((.5*phiI( Iwlf))*eps) * kChl(Iwle)'.*sigmoid); [MfII, MbII] = deal(fqe(2) * ((.5*phiII(Iwlf))*eps) * kChl(Iwle)'.*sigmoid);

3. aPAR_Cab_eta in the formula for calculating total fluorescence (Femtot) in SCOPE.m represents green ePAR * relative fluorescence emission efficiency, is the β2 parameter involved here?
   rad.Femtot = 1E3*(leafbio.fqe(2)* optipar.phiII(spectral.IwlF) * fluxes.aPAR_Cab_eta +leafbio.fqe(1)* optipar.phiI(spectral.IwlF) * fluxes.aPAR_Cab);

Looking forward to your answer! Many thanks!

Best regards,
Mengjia Qi