Community Model Development

Community Model Development

HAO develops large-scale, computational community models that support community research in upper atmospheric, ionospheric, and magnetospheric physics. It is one of HAO’s strategic imperatives to advance world-leading numerical models of the atmosphere and Sun-Earth system, make them widely available, and support their use by the scientific community. HAO models include the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM), the Thermosphere-Ionosphere-Mesosphere-Electrodynamics General Circulation Model (TIME-GCM), and the Whole Atmosphere Community Climate Model (WACCM), and the Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model developed as part of the Center for Integrated Space Weather Modeling (CISM), which is an NSF Science and Technology Center led by Boston University. WACCM is an inter-divisional collaboration that unifies aspects of the upper atmospheric modeling of HAO, the middle atmosphere modeling of NESL’s Atmospheric Chemistry Division, and the tropospheric modeling of NESL’s Climate and Global Dynamics Division, using the Community Climate System Model (CCSM) as a common numerical framework.  The high-altitude extension, referred to as “WACCM-X,” is the particular responsibility of HAO. 

Development of the TIE-GCM version 1.94 was concluded in FY2011. The model was tested and compared to various thermosphere/ionosphere measurements, and it was released to the community in June 2011. The key feature of this new version is the inclusion of the Weimer model of high-latitude electric potential imposed by the magnetosphere, which enable the TIE-GCM to be run using solar wind and interplanetary magnetic field as input drivers. Auroral precipitation patterns corresponding to the Weimer model, and a new variable location of the cross-over latitudes between high- and low-latitude electric potentials, are included in the new release, as well as several standardized diagnostic fields, various new minor features, and some bug fixes.