diff --git a/experiments/AMIP/README.md b/experiments/AMIP/README.md new file mode 100644 index 0000000000..96744afb9a --- /dev/null +++ b/experiments/AMIP/README.md @@ -0,0 +1,61 @@ +## Current AMIP components + +### Atmosphere + +Dynamical core: +- Equation: non-hydrostatic and fully compressible +- Prognostic variables: Density, velocity components, total energy, total specific humidity +- Spatial discretization: Spectral element in the horizontal, finite difference in the vertical, cubed sphere +- Time stepping: Implicit-explicit additive Runge–Kutta method + +Parameterizations: + +- Radiation: A scheme based on RRTM for General circulation model applications—Parallel (RRTMGP) (Pincus et al. 2019) + +- Convection and turbulence: Diagnostic Eddy-diffusivity Mass-Flux (EDMF) scheme with prognostic turbulent kinetic energy. +EDMF is a unified parameterization for turbulence and convection (Tan et al. 2018, Cohen et al. 2020, Lopez-Gomez et al. 2020). The grid is decomposed into convective updrafts and the turbulent environment. +Updraft properties are calculated from mass, momentum and energy conservation of the updraft. +Mass and momentum exchange between the updrafts and the environment, and +turbulent mixing in the environment, are represented with physical closures. Currently, only one updraft is used. + +- Microphysics: 0-moment scheme, where cloud condensate is removed in-situ with a constant timescale + +- Surface fluxes: A scheme based on Monin-Obukhov similarity theory, with constant roughness lengths over land and ocean + +- Orographic gravity wave drag: None + +- Non-orographic gravity wave drag: None + +- Aerosols and chemistry: None + +### Land + +Dynamical core: +- Equation: Following Manabe bucket hydrology scheme (Manabe 1969) +- Prognostic variables: Temperature, water content, snow water content +- Spatial discretization: Finite difference, multiple independent columns on the sphere +- Time stepping: Explicit additive Runge–Kutta method + +Land surface albedo: +- Bare ground: Prescribed from files +- Snow: Constant + +### Sea ice + +Thermodynamics: 0-layer model, with prognostic ice surface temperature and fixed ice thickness + +### Coupling + +Sequential coupling. Fluxes over a heterogeneous surface are calculated using the averaged surface properties. + +## References + +[Manabe 1969](https://journals.ametsoc.org/view/journals/mwre/97/11/1520-0493_1969_097_0739_catoc_2_3_co_2.xml): Climate and ocean circulation. I. The atmospheric circulation and the hydrology of the earth's surface. + +[Pincus et al. 2019](https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019MS001621): Balancing Accuracy, Efficiency, and Flexibility in Radiation Calculations for Dynamical Models + +[Tan et al. 2018](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017MS001162): An Extended Eddy-Diffusivity Mass-Flux Scheme for Unified Representation of Subgrid-Scale Turbulence and Convection + +[Cohen et al. 2020](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020MS002162): Unified Entrainment and Detrainment Closures for Extended Eddy-Diffusivity Mass-Flux Schemes + +[Lopez-Gomez et al. 2020](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020MS002161): A Generalized Mixing Length Closure for Eddy-Diffusivity Mass-Flux Schemes of Turbulence and Convection \ No newline at end of file