Opened 4 years ago

Last modified 11 months ago

#303 new enhancement

Revise stomate_growth_fun_all

Reported by: luyssaert Owned by: somebody
Priority: minor Milestone: Not scheduled yet
Component: Biogeochemical processes Version: trunc
Keywords: Cc:

Description

(1) The phenological allocation was coded in a very precise way. This helped to build confidence in the approach and to close the C budget but it makes the routine hard to digest. This first part could probably be simplified with only small consequences for the allocation itself.
(2) The rule of Deleuze and Dhote is a linear function. Consequently, larger trees get more C to allocate. When a tree becomes really big, the rule results in large trees growing unrealistically fast. The linear rule should be replaced by a saturating rule.
(3) Jointly calculating intra-stand competition and allocation requires linearisation of the equations to derive an analytical solution. This was feasible for the linear rule of Deleuze and Dhote but may become overly complex when an power-function is used. To overcome this issue GPP could be distributed according to a power-rule (replacing Deleuze and Dhote). Rm could then be calculated for each diameter class and finally Cs, Cr, Cl and Rg could all be allocated at once following the current allometric rules.

Change History (4)

comment:1 Changed 3 years ago by luyssaert

After closer inspection of the equations, point 3 is very simple to implement. The power of deleuze and dhote was externalized (r4968) and is being used to optimize tree ring growth.

comment:2 Changed 2 years ago by luyssaert

  • Milestone changed from IPSLCM6.v2 to ORCHIDEE 3.0

This ticket was moved from v6.2 to ORCHIDEE_3.0. Point (1) remains to be done but is not considered a blocking issues

comment:3 Changed 2 years ago by luyssaert

  • Milestone changed from ORCHIDEE 3.0 to ORCHIDEE 4.0

comment:4 Changed 11 months ago by luyssaert

  • Milestone changed from ORCHIDEE 4.0 to Not scheduled yet
  • Version set to trunc
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