Spatial-Spectral EOF Analysis of TES Data

Details Spatial-Spectral EOF Analysis of TES Data Spatial-Spectral EOF Analysis of TES Data

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.1412h&link_type=abstract

American Astronomical Society, DPS meeting #35, #14.12; Bulletin of the American Astronomical Society, Vol. 35, p.936

Astronomy and Astrophysics

Astronomy

Scientific paper

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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