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The purpose of this section is to summarize what capability is to be added to the ACME Ocean and Ice system through E3SM land through this design process. It should be clear what new code will do that the current code does not. Summarizing the primary challenges with respect to software design and implementation is also appropriate for this section. Finally, this statement should contain general statement with regard to what is “success.”Date last modified:
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Implementation:
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Requirements
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The PHS model needs to conform to the big leaf model.
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Contributors: Yilin Fang Ruby Leung
Algorithmic Formulations
The algorithm follows the approach in Kennedy et al. (2019), which solves vegetation water potential in the root, stem, and sunlit leaf and shaded leaf. Water stress factor BTRAN is a function of leaf water potential instead of the soil matric potential. Four steady state equations (continuity of fluxes) are solved given transpiration and soil matric potentials in each soil layer as boundary conditions. Equations can be found in Kennedy et al. (2019).
Figure 1. Plant hydraulic circuit analog schematic (Kennedy et al., 2019)
Reference:
Kennedy, D., S. Swenson, K. W. Oleson, D. M. Lawrence, R. Fisher, A. C. L. da Costa, and P. Gentine (2019), Implementing Plant Hydraulics in the Community Land Model, Version 5, J Adv Model Earth Sy, 11(2), 485-513, doi:10.1029/2018MS001500.
Design solution:
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Solution follows Kennedy et al.
Design and Implementation
Implementation:
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Planned Verification and Unit Testing
Verification and Unit Testing: short-desciption-of-testing-here
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The E3SM Developers test suite was used to make unit testing with PHS model turned off. In addition, the code will be submitted for expert review on the process of PR.
The PHS will be tested against the point simulation published in Kennedy et al. (2019).
Planned Validation Testing
Validation Testing: short-desciption-of-testing-here
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The PHS will be validated using point and global simulation.
Planned Performance Testing
Performance Testing: short-desciption-of-testing-here
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Global simulation will be tested for performance.
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