Isca, v1.0: A framework for the global modelling of the atmospheres of Earth and other planets at varying levels of complexity

Geoffrey K. Vallis, Greg Colyer, Ruth Geen, Edwin Gerber, Martin Jucker, Penelope Maher, Alexander Paterson, Marianne Pietschnig, James Penn, Stephen I. Thomson

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)843-859
Number of pages17
JournalGeoscientific Model Development
Volume11
Issue number3
DOIs
StatePublished - Mar 6 2018

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Planets
Atmosphere
planet
Earth (planet)
planetary atmosphere
atmosphere
Forcing
Modeling
Python
modeling
Radiation
simulation
Geophysical Fluid Dynamics
atmospheric forcing
heat capacity
obliquity
atmospheric general circulation model
fluid dynamics
Relaxation Scheme
Exoplanets

ASJC Scopus subject areas

  • Modeling and Simulation
  • Earth and Planetary Sciences(all)

Cite this

Isca, v1.0 : A framework for the global modelling of the atmospheres of Earth and other planets at varying levels of complexity. / Vallis, Geoffrey K.; Colyer, Greg; Geen, Ruth; Gerber, Edwin; Jucker, Martin; Maher, Penelope; Paterson, Alexander; Pietschnig, Marianne; Penn, James; Thomson, Stephen I.

In: Geoscientific Model Development, Vol. 11, No. 3, 06.03.2018, p. 843-859.

Research output: Contribution to journalArticle

Vallis, GK, Colyer, G, Geen, R, Gerber, E, Jucker, M, Maher, P, Paterson, A, Pietschnig, M, Penn, J & Thomson, SI 2018, 'Isca, v1.0: A framework for the global modelling of the atmospheres of Earth and other planets at varying levels of complexity', Geoscientific Model Development, vol. 11, no. 3, pp. 843-859. https://doi.org/10.5194/gmd-11-843-2018
Vallis, Geoffrey K. ; Colyer, Greg ; Geen, Ruth ; Gerber, Edwin ; Jucker, Martin ; Maher, Penelope ; Paterson, Alexander ; Pietschnig, Marianne ; Penn, James ; Thomson, Stephen I. / Isca, v1.0 : A framework for the global modelling of the atmospheres of Earth and other planets at varying levels of complexity. In: Geoscientific Model Development. 2018 ; Vol. 11, No. 3. pp. 843-859.
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