isca, v1.0: a framework for the global modelling of the atmospheres of earth and other planets at varying levels of complexity
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ID: 222933
2018
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Abstract
Isca is a framework for the idealized modelling of the global
circulation of planetary atmospheres at varying levels of complexity and
realism. The framework is an outgrowth of models from the Geophysical Fluid
Dynamics Laboratory in Princeton, USA, designed for Earth's atmosphere, but
it may readily be extended into other planetary regimes. Various forcing and
radiation options are available, from dry, time invariant, Newtonian thermal
relaxation to moist dynamics with radiative transfer. Options are available
in the dry thermal relaxation scheme to account for the effects of obliquity
and eccentricity (and so seasonality), different atmospheric optical depths
and a surface mixed layer. An idealized grey radiation scheme, a two-band
scheme, and a multiband scheme are also available, all with simple moist
effects and astronomically based solar forcing. At the complex end of the
spectrum the framework provides a direct connection to comprehensive
atmospheric general circulation models.
For Earth modelling, options include an aquaplanet and configurable continental outlines and topography. Continents may be defined by changing albedo, heat capacity, and evaporative parameters and/or by using a simple bucket hydrology model. Oceanic Q fluxes may be added to reproduce specified sea surface temperatures, with arbitrary continental distributions. Planetary atmospheres may be configured by changing planetary size and mass, solar forcing, atmospheric mass, radiation, and other parameters. Examples are given of various Earth configurations as well as a giant planet simulation, a slowly rotating terrestrial planet simulation, and tidally locked and other orbitally resonant exoplanet simulations.
The underlying model is written in Fortran and may largely be configured with Python scripts. Python scripts are also used to run the model on different architectures, to archive the output, and for diagnostics, graphics, and post-processing. All of these features are publicly available in a Git-based repository.
For Earth modelling, options include an aquaplanet and configurable continental outlines and topography. Continents may be defined by changing albedo, heat capacity, and evaporative parameters and/or by using a simple bucket hydrology model. Oceanic Q fluxes may be added to reproduce specified sea surface temperatures, with arbitrary continental distributions. Planetary atmospheres may be configured by changing planetary size and mass, solar forcing, atmospheric mass, radiation, and other parameters. Examples are given of various Earth configurations as well as a giant planet simulation, a slowly rotating terrestrial planet simulation, and tidally locked and other orbitally resonant exoplanet simulations.
The underlying model is written in Fortran and may largely be configured with Python scripts. Python scripts are also used to run the model on different architectures, to archive the output, and for diagnostics, graphics, and post-processing. All of these features are publicly available in a Git-based repository.
| Reference Key |
vallis2018geoscientificisca,
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|---|---|
| Authors | ;G. K. Vallis;G. Colyer;R. Geen;E. Gerber;M. Jucker;P. Maher;A. Paterson;M. Pietschnig;J. Penn;S. I. Thomson |
| Journal | international journal of quantum chemistry |
| Year | 2018 |
| DOI |
10.5194/gmd-11-843-2018
|
| URL | |
| Keywords |
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