Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa23a..01s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SA23A-01
Mathematics
Logic
0355 Thermosphere: Composition And Chemistry, 3315 Data Assimilation, 3367 Theoretical Modeling, 3384 Acoustic-Gravity Waves, 3389 Tides And Planetary Waves
Scientific paper
We are developing a thermosphere-ionosphere-plasmasphere data assimilation model that will be used as an upper atmospheric component of a comprehensive surface-to-space meteorological model. The ionosphere - plasmasphere data assimilation model was developed as part of an effort called the Global Assimilation of Ionosphere Measurements (GAIM). This data assimilation model is based on a physics-based model of the ionosphere-plasmasphere system that covers the E-region, F-region, topside ionosphere, and plasmasphere (from 90 -30,000 km). This model is capable of assimilating real-time (or near real -time) data from a variety of sources, including bottomside Ne profiles from ionosondes, slant GPS/TEC from a network of stations, in situ Ne from DMSP satellites, line-of-sight UV emissions measured by satellites, and occultation data. The data are assimilated via an ensemble Kalman filter technique. In addition to the global Ne distribution, the data assimilation model also provides global distributions of the self- consistent drivers (neutral winds, O/N2 composition, and electric fields). The thermosphere data assimilation model has been constructed from a physics-based, global, thermosphere model using an ensemble Kalman filter technique. This model will be able to assimilate UV radiances from the SSUSI and SSULI instruments, in situ winds and densities along satellite tracks, and inferred neutral parameters from incoherent scatter radars. The goal is to couple the thermosphere-ionosphere-plasmasphere data assimilation model to the Navy's troposphere weather model (NOGAPS-ALPHA) at 90 km, and this will yield a complete surface-atmosphere-space weather model. To date, time-dependent wave fields from NOGAPS- ALPHA were imposed at the lower boundary of the upper atmosphere model and the effect on the thermosphere was studied. Simulations were conducted with progressively better spatial and temporal resolutions, which allowed us to incorporate a wide spectrum of waves. These and other results will be presented.
Drob Douglas P.
Eckermann Stephen D.
Gardner Carl L.
Hoppel Karl
Scherliess Ludger
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