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Issue about the calculation of photosynthesis in CLM4

1

11438023@zju_edu_cn

Member
Dear all, I have some issues regarding to the calculation of photosynthesis in CLM4:(1) I calculate the global annual mean of "fpsn" from model outputs (photosynthesis) for year-1850 control case, which is about 188 GtC/yr;(2) For the same case, according to both model codes and CLM_TECH_NOTE, I calculate fpsn = psnsha * laisha + psnsun * laisun using psnsha, psnsun, laisha, and laisun from model outputs.  However, the value is about 128 GtC/yr.I use compset E1850CN with resolution f19_g16. CN mode is turned on. I am not sure I understand why there is an inconsistency between these two results... Any suggestion? Best,
Lei
 
1

11438023@zju_edu_cn

Member
One possibility I am thinking is that since there are up to sixteen different plant function types, the equation:fpsn = psnsha * laisha + psnsun * laisunmay be suitable for each PFT during model calculation but not for results directly from model outputs?    Am I right?Thanks! Lei
 
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