Hardening and frost mortality schemes #836
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2024-01-22 22:51:30
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| Task | Status |
|---|---|
| If use_frost_hard=.true. -->The hardiness level is used to predict frost mortality instead of the fixed PFTfreezetol parameter.The magnitude of a frost event is given by the difference between the minimum temperature and the hardiness level, and frost occurs when the minimum temperature is below the hardiness level. --> Frost can now be experienced by all PFTs if temperature decreases faster than the acclimation rate of plants. Even PFTs with a PFTfreezetol of -80 might endure frost. The new implementation keeps the purpose of constraining PFT distribution as PFTfreezetol limits the hardiness level. | Incomplete |
| If use_hydro_hard=.true. : The hardiness level is also used to constrain stomatal transpiration and hydraulic conductivity. The hardiness level reduces hydraulic failure mortality and modifies the PV curves. The hardening scheme may potentially (not in this PR) be used to modify plant phenology and more specifically the timing of leaf onset and offset. | Incomplete |
| frost_hard: While we keep the distribution purpose of the previous frost parametrization, now there is frost when there should be frost, --> total biomass levels are usually only slightly impacted | |
| --> Side effect of frost_hard: In the previous frost parametrization, damage started 5deg above the PFTfreezetol parameter, here it starts at the hardiness level and is maximum 5deg below the hardiness level. So PFTs with a freezetol of 2.5 will now have injury at -2 instead of 7.5, this might have some impacts on enhancing the growth of topical PFTs in the arctic region. However in a multi-PFT run they won't be competitive enough, and in single PFT runs, they do not grow much as much as extratropical PFTs. | Incomplete |
| hydro_hard : Has major impacts of the biomass in northern regions as this prevents water fluxes during winter. Plants do not desiccate to the same extent as before and survive cold winters. | Incomplete |
| I also changed FatesHydroWTFMod.F90 to not allow water potentials below -25Mpa. | Incomplete |
| [ x] My change requires a change to the documentation. | Incomplete |
| I have updated the in-code documentation .AND. (the technical note .OR. the wiki) accordingly. | Incomplete |
| I have read the CONTRIBUTING document. | Incomplete |
| FATES PASS/FAIL regression tests were run | Incomplete |
| If answers were expected to change, evaluation was performed and provided | Incomplete |
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