| 679 | | Describes r6721. Tree ring width is always calculated and is not controlled by any flags or additional parameters. The basal area increment is central in the allocation scheme when making use of the Deleuze and Dhote rule to account for within stand competition between trees with different dimensions. It is saved to the output variable CCDELTABA (mm2 day-1). Basal area increment can be used to calculate the tree ring width when assuming that the cross-section of a tree trunk is circular. The output variable CCTRW represents the radial increase of individual trees for each circumference class (mm day-1). Since CCTRW is simply sqrt(ba_later/pi) - sqrt(ba_beginning/pi), it reconstructs trees from zero at year 1 removing the effect of BA_init. An implication of this approach is that the value at the first time step does not only include the growth calculated in stomate_growth_fun_all but also the basal area that was prescribed in stomate_prescribe.f90. The contribution of the initial tree dimensions prescribed in stomate_prescribe becomes more important if bigger trees are prescribed. Both CCDELTABA and CCTRW are written to stomate_4dim.nc. |
| | 679 | Describes r6721. Tree ring width is always calculated and is not controlled by any flags or additional parameters. The basal area increment is central in the allocation scheme when making use of the Deleuze and Dhote rule to account for within stand competition between trees with different dimensions. It is saved to the output variable CCDELTABA (mm2 day-1). Basal area increment can be used to calculate the tree ring width when assuming that the cross-section of a tree trunk is circular. The output variable CCTRW represents the radial increase of individual trees for each circumference class (mm day-1). Since CCTRW is simply sqrt(ba_later/pi) - sqrt(ba_beginning/pi), it reconstructs trees from zero at year 1 removing the effect of BA_init. An implication of this approach is that the value at the first time step does not only include the growth calculated in stomate_growth_fun_all but also the basal area that was prescribed in stomate_prescribe.f90. The contribution of the initial tree dimensions prescribed in stomate_prescribe becomes more important if bigger trees are prescribed. Both CCDELTABA and CCTRW are written to stomate_4dim.nc. |
| | 680 | |
| | 681 | === Trusting === |
| | 682 | Describes r8058. The flag '''ANNUAL_PROC_END_OF_YEAR''' with default True is added. If it is set to false in orchidee.def, then the annual processes are done in the end of June. As long as the 1Y+1Y=2Y test cannot be performed in the trusting, we have no means to check whether the processes done at the end of year are restartable. One work around is to add the functionality to do the annual processes in the end of June instead of the end of the year. This function should only be used in the trusting it has no operational applications. '''This option could later be added to the default trusting tests.''' |
| | 683 | |
| | 684 | Describes rXXXX. When set to y the flag '''TRUSTING_HACK_AGE_CLASS''' skips the calculation of redistributing biomass between age classes. In age_class_distr their is a calculation that redistributes the biomass between age classes. Although mass is conserved during this calculation it results in precision errors that propagate through the model calculations. In the trusting we could have one test case that helps to check the technical integrity of the age class distribution code: if the model is run without LCC and disturbances, A simulation without age classes should generate the exact same results as one with age classes (but the dimensions of these simulations differ). If biomass is recalculated this test fails. With this hack, the biomass is explicitly moved from one age class to another without any calculations and thus without any precision errors. With this hack set to .TRUE. the model can be trusted for the age class code. This hack should not be used in simulation experiments as biomass from different age classes will NOT be merged but simply overwritten. If all goes well this should result in a mass balance error. '''This option could later be added to the default trusting tests.''' |
