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The Antarctic ozone hole changes the solar heating in the atmosphere, and it is fairly well established that this impacts the Southern Annular Mode winds (SAM) and hence surface stress on the ocean and thereby ocean currents that may have implications for sea-ice and ice-sheet melting (ACME v1 cryosphere science driver).
The interannual variability of the Antarctic ozone hole is quite large, so this variability may impact the probability of warm water reaching the base of the ice-sheets and triggering rapid melting.
To implement an Antarctic ozone hole that is consistent with the ACME model state and provides variability in the future requires an interactive stratospheric ozone capability. Specifying stratospheric ozone with monthly-mean data files (the current ACME default) will not provide ozone that is consistent with the model state, and it is not clear how to provide the variability in the future.
Many stratospheric ozone and ozone-hole capabilities have been developed, but most of them are far too computationally expensive to even consider for the high-resolution ACME v1 cryosphere simulations. However, there is one scheme (Linoz) which is well tested and computationally fast: it only requires the computational cost of a single advected tracer.
Linoz was developed by Michael Prather's group at UC Irvine, and Linoz-v2 was implemented into CAM several years ago for the LLNL_super_fast chemical mechanism, and subsequently incorporated into the NCAR trop_mozart mechanism too.
The goal of this task is to implement Linoz for ACME-v1, and tune it to reproduce the statistics of the historical Antarctic ozone hole.
Requirements
Requirement: Combine Linoz-v2 and MAM3 in a new chemical mechanism.
Date last modified: Contributors: Philip Cameron-Smith (Unlicensed) (add your name to this list if it does not appear)
Create a new chemistry mechanism that adds Linoz-v2 to MAM3.
Requirement: Implement Linoz-v2 into the default MAM4 chemistry configuration.
Date last modified: Contributors: Philip Cameron-Smith (Unlicensed) (add your name to this list if it does not appear)
Create a new chemistry mechanism that adds Linoz-v2 to MAM3. Make this the default for ACME v1 simulations.
Requirement: name-of-requirement-here
Date last modified: Contributors: Philip Cameron-Smith (Unlicensed) (add your name to this list if it does not appear)
Tune simulation to reproduce statistics of Antarctic ozone hole and stratospheric ozone hole (trends and variability).
Algorithmic Formulations
Design solution: short-description-of-proposed-solution-here
Date last modified:
Contributors: Philip Cameron-Smith (Unlicensed) (add your name to this list if it does not appear)
Linoz was developed by Michael Prather's group at UC Irvine, and Linoz-v2 was implemented into CAM several years ago for the LLNL_super_fast chemical mechanism
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.
Design and Implementation
Implementation: short-desciption-of-implementation-here
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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?
Planned Verification and Unit Testing
Verification and Unit Testing: short-desciption-of-testing-here
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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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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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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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