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Requirements
Requirement:
name-of-requirement-hereProvide more efficient accelerated decomposition (AD) for land biogeochemistry
Date last modified:
Contributors: Daniel Ricciuto
Each requirement is to be listed under a ”section” heading, as there will be a one-to-one correspondence between requirements, design, proposed imple- mentation and testing. Requirements should not discuss technical software issues, but rather focus on model capability. To the extent possible, require- ments should be relatively independent of each other, thus allowing a clean design solution, implementation and testing plan.
Algorithmic Formulations
Design solution: short-description-of-proposed-solution-here
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Contributors: (add your name to this list if it does not appear)
For each requirement, there is a design solution that is intended to meet that requirement. Design solutions can include detailed technical discussions of PDEs, algorithms, solvers and similar, as well as technical discussion of performance issues. In general, this section should steer away from a detailed discussion of low-level software issues such as variable declarations, interfaces and sequencing
Provide a framework to reach steady state in accelerated mode in land model (with active biogeochemistry) in a reduced amount of time (< 500 years) for any given climate, plant functional type, or choice of model parameters affecting decomposition rate.
Requirement: Provide option to bypass DATM and model coupler for offline land model simulations
Date last modified:
Contributors: Daniel Ricciuto
Provide a framework to read in all model relevant inputs at the time of initialization, including meteorology, nitrogen deposition, aerosol deposition, fire data, and co2 concentrations.
Algorithmic Formulations
Design solution: Provide more efficient accelerated decomposition (AD) for land biogeochemistry
Date last modified:
Contributors: Daniel Ricciuto
Modification 1) if (model_year) < 20, set carbon_only mode active
Modificaiton 2) In accelerated mode For dead croot and dead stem carbon only, accelerate mortality by a factor of 10
In accelerated mode, multiply dead stem/croot carbon pools by a factor of 10 for biomass calculation in fire model.
In accelerated mode,multiply dead stem/croot carbon pools by a factor of 10 for biomass/height relationship
Modification 3) In accelerated mode, modify acceleration factors (af) of slow pools (> 1 year) from constants to a functional form: af = f(k, Q10, MAT).
MAT = mean annual temperature, k = rate constant for decomposition (at 25C), Q10 = temperature sensitivity
In accelerated mode, increase vertical transport to match acceleration factors.
Design solution: Provide option to bypass DATM and model coupler for offline land model simulations
Date last modified:
Contributors: Daniel Ricciuto
No algorithmic changes necessary.
Design and Implementation
Implementation:
short-desciption-of-implementation-here Provide more efficient accelerated decomposition (AD) for land biogeochemistry
Date last modified:
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Contributors: Daniel Ricciuto
This section should detail the plan for implementing the design solution for requirement XXX. In general, this section is software-centric with a focus on software implementation. Pseudo code is appropriate in this section. Links to actual source code are appropriate. Project management items, such as svn branches, timelines and staffing are also appropriate. How do we typeset pseudo code?
Implementation: Provide option to bypass DATM and model coupler for offline land model simulations
Date last modified:
Contributors: Daniel Ricciuto
The following subroutines are modified (Based on v0 code; this list will be revised on further review of both CNP and interface codes)
ccsm_driver: Disable lnd2cpl communication if cpl_bypass option is used. Disable writing logfile information every timestep.
lnd_comp_mct: Disable lnd_export subroutine if cpl_bypass option is used.
atm2lndType: Define and allocate new variables for met data, co2, c13o2, ndep, aerosol, hdm, lnfm inputs.
lnd_import_export
Planned Verification and Unit Testing
Verification and Unit Testing: short-desciption-of-testing-here
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Contributors: (add your name to this list if it does not appear)
How will XXX be tested? i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?
Planned Validation Testing
Validation Testing: short-desciption-of-testing-here
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Contributors: (add your name to this list if it does not appear)
How will XXX be tested? What observational or other dataset will be used? i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?
Planned Performance Testing
Performance Testing: short-desciption-of-testing-here
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Contributors: (add your name to this list if it does not appear)
How will XXX be tested? i.e. how will be we know when we have met requirement XXX. Will these unit tests be included in the ongoing going forward?
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