Statistics – Computation
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm41a0324w&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM41A-0324
Statistics
Computation
2427 Ionosphere/Atmosphere Interactions (0335), 2447 Modeling And Forecasting, 7959 Models
Scientific paper
As part of the efforts within the Integrated Dynamics through Earth's Atmosphere (IDEA) project, a global ionosphere-plasmasphere module is coupled to an extended global atmosphere model. The extended global atmosphere model is based on the NOAA/NCEP's GFS (Global Forecast System), which is extended to about 600 km in the vertical, along with new physical and chemical processes/parameterizations that are important for the upper mesosphere and thermosphere. These parameterizations include CO2 cooling, molecular diffusion, and photochemistry, etc. The extended GFS also includes effects of ionosphere plasmas, e.g., Joule heating and ion drag. The global ionosphere-plasmasphere module, denoted as GIP, is based on the CTIP (Coupled Thermosphere- Ionosphere-Plasmasphere) model. While the CTIP model uses the modified dipole geomagnetic field, the GIP module uses the IGRF (International Geomagnetic Reference Field) geomagnetic field. It solves the continuity equations and the steady-state momentum equations for densities and velocities of O+ and H+ ions along the geomagnetic flux tubes using the finite difference schemes. These flux tubes have a fixed geographic base height of 90 km and maximum heights up to about 10,000 km. GIP also has an option of solving the quasi- steady-state energy equations for temperatures of O+ and H+ ions and electrons. GFS is a parallel model using MPI (Message Passing Interface) while GIP is a serial code module. In coupling the GIP module to the extended GFS, the neutral atmosphere temperature, velocity, and O, O2 and N2 densities, etc. from GFS are collected onto one computational node and then interpolated to the GIP grids as input to GIP. Output from the GIP module, such as ion velocities, ion and electron temperature and densities, etc, are then interpolated to the GFS grids and scattered back to the corresponding GFS computational nodes. In the future, the ESMF (Earth System Modeling Framework) libraries and regridding utilities will be used for coupling GFS with GIP. This presentation will focus on analyses of results from one-way coupling, i.e., forcing of GIP by the extended GFS.
Akmaev Rashid
Codrescu Mihail
Fuller-Rowell Tim
Maruyama Naomi
Millward George
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