Opened 4 years ago

Last modified 15 months ago

#396 assigned defect

Carbon mass conservation problem

Reported by: nvuilsce Owned by: nicolasviovy
Priority: major Milestone: Not scheduled yet
Component: Biogeochemical processes Version: trunc
Keywords: closure C balance Cc:

Description

When performing spinup run for TRENDY, I diagnosed a problem in the closure of the carbon balance. nbp variable has a value of -0.02 Pg/yr-1 (= a source for surface to atm) over the 10 year of climate forcings (used for the spinup) while stocks of carbon increase of ~0.02 Pg/yr-1.

Change History (6)

comment:1 Changed 4 years ago by nvuilsce

There is a bug in stomate_npp line 301
It should be
biomass(i,j,icarbres,icarbon) = biomass(i,j,icarbres,icarbon) + &

bm_alloc_tot(i,j) - resp_maint(i,j) * dt

not "- bm_alloc_tot"

but this has no impact on the probleme reported.

comment:2 Changed 4 years ago by jgipsl

  • Milestone changed from IPSLCM6.v1 to ORCHIDEE 3.0
  • Version changed from orchidee_1_9_7 to trunc

The small correction described in the comment is commit in rev [4728].

The ticket is still not fixed but set to milestone ORCHIDEE 3.0

comment:3 Changed 3 years ago by aducharne

  • Owner changed from somebody to nicolasviovy
  • Status changed from new to assigned

Linked to #456

comment:4 Changed 19 months ago by jgipsl

I checked in simulation FG1low.6216.irene recent spinup done at irene using revision 6216 on the trunk, default set up as in SPINUP_ANALYTIC (Trendy setup using v5.3 forcings). nbp global mean over the last 10 years in this simulation is 0.027 PgC/yr.

comment:5 Changed 19 months ago by jgipsl

  • Milestone changed from ORCHIDEE 3.0 to ORCHIDEE 4.0

According to the ORCH meeting 10/12/2019:

The issue will not be further investigated in current version of the trunk, 3.0. When branch CN-CAN has been integrated in the trunk, this kind of problem could more easily be searched for. This ticket is related to #419 and solving that ticket might solve this one as well.

comment:6 Changed 15 months ago by luyssaert

  • Milestone changed from ORCHIDEE 4.0 to Not scheduled yet
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