DPS 35th Meeting, 1-6 September 2003
Session 14. Mars Atmosphere II
Poster, Highlighted on, Wednesday, September 3, 2003, 3:00-5:30pm, Sierra Ballroom I-II

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[14.12] Spatial-Spectral EOF Analysis of TES Data

X. Huang, J. Liu, Y. Yung (Caltech)

We apply the spatial-spectral empirical orthogonal function (EOF) analysis to data obtained by Thermal Emission Spectrometer (TES). We study the 20*S -20*N TES data in three different periods: 110-120°Ls, 230-240°Ls and 350-360°Ls of the first MGS mapping year. They correspond to northern hemisphere summer, southern hemisphere summer (also a dust storm period), and northern hemisphere spring, respectively. For all three periods the bulk of the variance (over 90 (PC1), which is associated with surface or near-surface brightness temperature variations. The spatial patterns of PC1 at 110-120°Ls (230-240°Ls) show north-south contrast similar to the typical northern (southern) summer surface temperature patterns. The spatial patterns associated with PC1 at 350-360°Ls show a wave-like pattern. The second principal component (PC2) is associated with atmospheric variability, and a negative correlation between dust and ice absorptions can be clearly seen. The amplitudes of PC2s correlate with the dust activity. The spatial patterns of PC2s are highly correlated with topography: negative values in the highlands indicating that there are strong ice absorptions and weak CO2 and dust absorption in these regions; positive values in the lowlands indicating strong CO2 and dust absorptions and weak ice absorptions in these regions.

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Bulletin of the American Astronomical Society, 35 #4
© 2003. The American Astronomical Soceity.