GISS Atmosphere-Ocean Model is a computer program that simulates the Earth's climate in three dimensions on a latitude-longitude grid. The Model requires two kinds of input, specified parameters and prognostic variables, and generates two kinds of output, climate diagnostics and prognostic variables. The specified input parameters include physical constants, the Earth's orbital parameters, the Earth's atmospheric constituents, the Earth's topography, the Earth's surface distribution of ocean, glacial ice, or vegetation, and many others. The time varying prognostic variables include fluid mass, horizontal velocity, heat, water vapor, salt, and subsurface mass and energy fields.

Development of the GISS AOM has continued since it was first described in the early 1990s. The information presented here is limited to the current (2013) version, as described in a recent paper in Geophys. Res. Lett. Website content regarding older versions will be restored in the future.

Fast Atmosphere-Ocean Model: CO2 Experiments

In the Fast version of the model, FAOM, the ocean depth is limited to 100 m which reduces the ocean heat transport to 30%, but allows the model to reach full equilibrium in less than 100 simulated years.

Description of Condensation Routines

Line Graphs as Function of Time

Surface Air Temperature (°C) Planetary Albedo (%) Total Cloud Cover (%)
Precipitation (mm/day) Outward Thermal Rad. of Planet (W/m²) High Cloud Cover (%)
Water Vapor Mass (kg/m²) Thermal Rad. Greenhouse Effect (W/m²) Low Cloud Cover (%)
Sea Ice Cover (%) of Ocean Cloud Optical Depth Cloud Top Pressure (mb)
Heat Flux into Ocean (W/m²)

Line Graphs as Function of Latitude

Surface Air Temperature (°C) Planetary Albedo (%) Total Cloud Cover (%)
Precipitation (mm/day) Outward Thermal Rad. of Planet (W/m²) High Cloud Cover (%)
Water Vapor Mass (kg/m²) Thermal Rad. Greenhouse Effect (W/m²) Low Cloud Cover (%)
Sea Ice Cover (%) of Ocean Cloud Optical Depth Cloud Top Pressure (mb)
Static Energy Convergence by Dynamics (W/m²) Static Energy Convergence by Condensation (W/m²)
Static Energy Convergence by Radiation (W/m²) Static Energy Convergence by Surface Interaction (W/m²)
Static Energy Convergence by Dry Convection (W/m²)

Line Graphs as Function of Pressure

Temperature (°C) Specific Humididity (g/kg) Relative Humidity (%) Temperature Lapse Rate (°C/km)

Symmetric Equations on the Surface of a Sphere

Equivalences: Gradient Divergence Laplcian Curl Advection

Contact

Please address questions about the AOM website to Dr. Gary Russell.