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I think this is a rather minor one, but in refactoring some of the code from phenology, and I came across these dates to "reset" the clocks for Growing Degree Days (GDD) and Number of Chilling Days (NCD).
ncdstart =270!Northern Hemisphere begining November
gddstart =1!Northern Hemisphere begining January
else
ncdstart =120!Southern Hemisphere beginning May
gddstart =181!Northern Hemisphere begining July
endif
The values on the comments for the Northern Hemisphere, Nov 1 for NCD and Jan 1 for GDD, correspond to the Botta et al. (2000) phenology algorithm, however the coded value for NCD (ncdstart ) is Sept 27. The values for the Southern Hemisphere are consistent with Botta et al. (2000).
Presumably the earlier date is useful for when running FATES at very high latitudes, but I wanted to check that this was the intention for switching the dates, and adjust the comments accordingly. If we keep the coded value, I am also wondering if we should make the Southern Hemisphere values mirror those for the Northern Hemisphere (i.e., Mar 27 for ncdstart). Probably we could use the equinox dates or Oct 1 / Apr 1 because the current date seems a bit arbitrary.
The text was updated successfully, but these errors were encountered:
I think this is a rather minor one, but in refactoring some of the code from phenology, and I came across these dates to "reset" the clocks for Growing Degree Days (GDD) and Number of Chilling Days (NCD).
fates/biogeochem/EDPhysiologyMod.F90
Lines 1027 to 1034 in 626f5e2
The values on the comments for the Northern Hemisphere, Nov 1 for NCD and Jan 1 for GDD, correspond to the Botta et al. (2000) phenology algorithm, however the coded value for NCD (
ncdstart) is Sept 27. The values for the Southern Hemisphere are consistent with Botta et al. (2000).Presumably the earlier date is useful for when running FATES at very high latitudes, but I wanted to check that this was the intention for switching the dates, and adjust the comments accordingly. If we keep the coded value, I am also wondering if we should make the Southern Hemisphere values mirror those for the Northern Hemisphere (i.e., Mar 27 for
ncdstart). Probably we could use the equinox dates or Oct 1 / Apr 1 because the current date seems a bit arbitrary.The text was updated successfully, but these errors were encountered: