PFT, FPCGRID Dimensions

Good day!

I would just like to clarify the dimensioning of the fields PFT and FPCGRID in the DGVM history files. The dimensions (for both) are (time, pft, lat, lon) where pft goes from 0 to 9. In DGVM, there is indeed a maximum of 10 pft's but this NOT what the dimension "pft" is referring to, is it?

Is the dimension "pft" referring to the columns within the vegetated landunit? Since the values of the field PFT range from 0-14 for each of the 0-9 pft indices which would not make sense unless we take 0-14 to be the actual pft's (i.e. 14=C4, 13=C3, etc.) and the 0-9 to refer to something else like the columns.

If so, how are the columns oriented and numbered within the landunit? If, say, the vegetated land unit was represented as a box, where would column 0,1,2, etc. be?

And also, would there be a one-to-one correspondence between PFT and FPCGRID such, for example, at time 1, the plant type in column 1 of lat 1 and lon 1 of field PFT would have the fractional projective cover similarly found at time 1, column 1, lat&lon 1 in FPCGRID?
 

slevis

Moderator
Staff member
I think you've got it. The "pft" dimension really refers to slots (not spatially explicit in their locations) in the soil-covered part of the gridcell. The 0-14 numbers are clm's PFT indices starting with bare ground and ending with c4 grasses. And FPCGRID has 1 to 1 correspondence with PFT.

Sam
 
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