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We propose to apply the elevation class scheme to the ACME model in three stages. In the first stage, targeting ACME V2.0, elevation classes are added to the land model but not the atmosphere model. Land forcing fields (temperature, precipitation, downward longwave) from the atmosphere are lapsed with surface elevation at prescribed rates. Adjustments to ensure conservation of the grid cell mean are applied. Fluxes returned from land to atmosphere are aggregated to form grid cell mean. No changes in the coupler or atmosphere are needed. The elevation classes defined in the land model will be the same as that used in the second stage to facilitate comparison of results from the first and second stages and to reduce efforts for the second stage.
The second stage, targeting ACME V3.0, will assume the atmosphere and land models operate on the same grid and adopt the same elevation classification algorithm. This results in a one-to-one mapping between elevation classes in the land and atmosphere, so that no interpolation is required to couple the land and atmosphere for each elevation class. Although we expect this configuration to yield spectacular results, it does not allow the land model to distinguish subgrid watersheds.
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An estimate of staffing for completing stage one is listed below.
| name | group | tasks | person-months |
|---|---|---|---|
| Peter Thornton | land | ||
| Teklu Tesfa | land | ||
| Ruby Leung | land | 0.1 |
An estimate of staffing for completing stage two is listed below.
| name | group | tasks | person-months |
|---|---|---|---|
| Steve Ghan | atmosphere | lead and manage activity, develop post-processor | 3 |
| Steve Goldhaber | software | ||
| Peter Thornton | land | ||
| Teklu Tesfa | land | ||
| Rob Jacob | coupler | ||
| Ruby Leung | land | 0.1 |
Ghan, S. J., X. Bian, A. G. Hunt, and A. Coleman, 2002: The thermodynamic influence of subgrid orography in a global climate model, Climate Dynamics, 20, 31-44, 10.1007/s00382-002-0257-5.
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Leung, L. R., and S. J. Ghan, 1995: A subgrid parameterization of orographic precipitation. Theoretical and Applied Climatology, 52, 95-118. http://link.springer.com/article/10.1007/BF00865510
Leung, L. R., and S. J. Ghan, 1998: Parameterizing subgrid orographic precipitation and surface cover in climate models. Mon. Wea. Rev., 126, 3271-3291. http://dx.doi.org/10.1175/1520-0493(1998)126<3271:PSOPAS>2.0.CO;2
Leung, L.R., J.G. Michalakes, and X. Bian, 2001: Parallelization of a Subgrid Orographic Precipitation Scheme in an MM5-based Regional Climate Model. Lecture Notes on Computer Science – ICCS 2001. Springer Verlag, New York, pp195-203. http://link.springer.com/chapter/10.1007/3-540-45545-0_28