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what is the relation between (NPP-HR) and NEE and total ecosystem carbon?

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what is the relation between (NPP-HR) and NEE and total ecosystem carbon?

Hi,

I am wondering how the variable "NEE" and "TOTECOSYSC" is calculated in CLM?

For what I found:

nee(c) = -nep(c) + col_fire_closs(c) + dwt_closs(c) + product_closs(c) + col_hrv_xsmrpool_to_atm(c)

where:

nep(c) = gpp(c) - ar(c) - hr(c)

So my understanding is if (NPP - HR) is positive, nee should be negative (source) and total ecosystem carbon should increase (totecosysc) and the magnitude should be smaller than (NPP - HR) due to carbon loss from wildfire, etc. 

However, in my simulation results, I found a negative NEE and positive totecosysc when (NPP - HR) is negative. I am a little confused here.

Is this somehow related to the nitrogen down-regulation process? 

Any hints would be appreciated. Thanks!

 


 

oleson

totecosysc is:

 

cwdc (coarse woody debris) + totlitc (total litter) + totsomc (total soil organic matter) + totvegc (total vegetation carbon)

oleson

Without knowing exactly what you've changed it's hard to know if this behavior makes sense.

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