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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. 

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  • New File!
  • Defines Init, Restart, and update_iac2lnd subroutines
    • Init allocates memory for variables
    • Restart reads and writes iac2lnd information to/from the restart file
    • update_iac2lnd sets the ELM variables from the information passed from iac
      • Loops over the 1D array from iac and extracts the information for each grid, patch , and PFT on this grid

components/clm/src/main/lnd2iacMod.F90:

  • New File!
  • Defines Init and update_lnd2iac subroutines
    • KATE: Why no Restart?
    • Init allocates memory for hr, npp, and pftwt for all grid x PFT combinations
    • update_lnd2iac loops over patch and extracts variables by pft for this grid


Changes to EAM


components/cam/src/control/camsrfexch.F90: 

  • Input from IAC to EAM defined (fco2_iac)

components/cam/src/cpl/atm_import_export.F90: 

  • Code modified to check if iac component passed data first. If not, read from file

components/cam/src/cpl/cam_cpl_indices.F90: 

  • co2 flux from iac added to list of co2 flux indices


Design Solution: Implement compsets to activate different combinations of components

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Design Solution: Enable couplings through namelist options

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Design Solution: Embed algorithms for temporal & spatial resolution changes within the IAC component that are as flexible as possible

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Planned Verification and Unit Testing 

Verification and Unit Testing: Expert Review

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Contributors: 

The named experts provided extensive review of each other's work, to verify that the design and implementations met the stated requirements. Model testing at each stage of implementation was used to verify that intended changes were correctly implemented, and that unintended changes were avoided.


Planned Validation Testing 

Validation Testing:  Evaluation with iESM developed diagnostic scripts

Date last modified: 
Contributors: Katherine Calvin (Unlicensed), Alan Di Vittorio

The results of the ported code will be analyzed in a similar manner to that of the iESM (e.g., Thornton et al., 2017). We will not expect exact matches, since we are using a different ESM, but we can ensure the behavior matches expectations/previous experience.

Planned Performance Testing 

Performance Testing: Short simulations on multiple platforms

Date last modified: 
Contributors: Katherine Calvin (Unlicensed)

We do not expect GCAM to alter the performance of the coupled system, but we will perform short coupled simulations on multiple platforms to quantify the change.