Opened 4 months ago
Last modified 5 weeks ago
#728 new enhancement
Too frequent zero LAI in time series
Reported by: | luyssaert | Owned by: | somebody |
---|---|---|---|
Priority: | critical | Milestone: | ORCHIDEE 4.1 |
Component: | Biogeochemical processes | Version: | trunc |
Keywords: | Cc: |
Description (last modified by luyssaert)
In r6904 the large scale LAI is starting to look OK but when zooming in on the time series this version still has many more years with a zero LAI compared to ORCHIDEE 3 and Tag 2.1. This may be caused by:
- Problems with phenology (only if phenology is in part driven by soil moisture). Possible for PFT3, 10, 11, 12, 13, 14 and 15.
- Problems with Rm. If Rm > GPP during the senescence phase the reserves and labile C pools will be empty by the end of the year resulting in zero LAI the next year.
- PFTs 10, 11, 12, 13, 14 and 15 hardly grow. The grasslands have a rather high within-season turnover which may explain their limited growth but this is suspicious for the crop PFTs and finding its cause could help to solve this ticket.
Change History (2)
comment:1 Changed 4 months ago by luyssaert
- Description modified (diff)
comment:2 Changed 4 months ago by luyssaert
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Problems with phenology (only if phenology is in part driven by soil moisture). Possible for PFT3, 10, 11, 12, 13, 14 and 15.
PFTs 10, 11, 12, 13, 14 and 15 hardly grow. The grasslands have a rather high within-season turnover which may explain their limited growth but this is suspicious for the crop PFTs and finding its cause could help to solve this ticket.
Problems with Rm. If Rm > GPP during the senescence phase the reserves and labile C pools will be empty by the end of the year resulting in zero LAI the next year.
In r7012 grasslands in arid and semiarid regions are subject to frequent dying, which is problematic. This causes further problem of frequent false uptake of GPP simply by prescribing new sapling biomass for grassland. This potential problem needs to be fixed. It may in part be related to simulating a wrong starting date and or a too short growing season (which does not leave enough time to restore the reserves).