The Design Document page provides a description of the algorithms, implementation and planned testing including unit, verification, validation and performance testing. Please read Step 1.3 Performance Expectations that explains feature documentation requirements from the performance group point of view.
Design Document
In the table below 4.Equ means Equations and Algorithms, 5.Ver means Verification, 6.Perf - Performance, 7. Val - Validation, - completed, - in progress, - not done
Title: Improving the efficiency of land spinup and offline model simulations
Requirements and Design
ACME Land Group
Date:
Summary
Requirements
Requirement: Provide more efficient accelerated decomposition (AD) for land biogeochemistry
Date last modified:
Contributors: Daniel Ricciuto
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: Provide more efficient accelerated decomposition (AD) for land biogeochemistry
Date last modified:
Contributors: Daniel Ricciuto
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
Date last modified:
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?