Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufm.p32e..08h&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #P32E-08
Physics
3337 Numerical Modeling And Data Assimilation, 3346 Planetary Meteorology (5445, 5739), 5409 Atmospheres: Structure And Dynamics, 5445 Meteorology (3346), 6225 Mars
Scientific paper
Planetary exploration has reached a new level with the Mars Global Surveyor in general, and the Thermal Emission Spectrometer (TES) in particular. For the first time there is enough data to specify the full state of a planetary atmosphere---temperature, horizontal and vertical wind, geopotential height, and surface pressure as functions of latitude, longitude, altitude, and time. In fact, the number of new independent observations per day---approximately 150,000 TES spectra---is comparable to or greater than the dimensionality of a practical global Mars general circulation model (GCM). Using a four-dimensional variational data assimilation approach, it is therefore possible to solve an over-determined system for the daily meteorology. The specially designed GCM is treated as imperfect, with the highly variable and uncertain diabatic forcing function part of the control variable. Either retrieved TES temperature profiles or TES calibrated radiances can be used as the input data. The former are fit with a root-mean-square residual of 2 K, the latter with a residual of 1 erg/cm2/s/sr/cm-1. The observed seasonal variations in mean temperatures and zonal winds correspond well with GCM calculations. However, there is a marked asymmetry in the transitions between seasons: the change from northern summer to southern summer conditions (as indicated by the sense and intensity of the meridional Hadley cell) is very sharp; the transition from southern summer to northern summer is very gradual. Wave activity is dominated at all seasons by the diurnal and semi-diurnal tides. What appear to be baroclinic waves (primarily wavenumbers 1 and 2) occur in both northern and southern mid- and high latitudes with greatest amplitudes in spring and fall.
Bergstrom Robert W.
Houben Howard
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