How is a variable in pft-based format transformed into grid-cell format ?

[Xueli Huo]

Hi all,

I don't know how the grid-cell value of a variable, for example, tlai, is calculated from the pft value of the same variable ? Any source file does the translation ?

Sincerely,

 

[oleson]

This is done in subgridAveMod.F90.
For example, the variable TLAI which is pft-level, is averaged up to grid-cell level using subroutine p2g within that module.
A weighted average approach is used where the weights are the fraction of each pft in a given gridcell (coming from the surface dataset used).