[Previous] | [Session 14] | [Next]
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.
[Previous] | [Session 14] | [Next]
Bulletin of the American Astronomical Society, 35 #4
© 2003. The American Astronomical Soceity.