Bob Clark wrote:
Mellon and Phillips may not have been aware of the recent TES measurements of temperatures in the southern hemisphere.

Alex writes:
Uh, I'm sure that Mellon and Phillips are aware of the "recent TES measurements." In fact, Mellon has co-authored a paper using TES data:

Jakosky, B. M. ; Mellon, M. T. ; Kieffer, H. H. ; Christensen, P. R. ; Varnes, E. S. ; Lee, S. W. 1999
The thermal inertia of Mars from the Mars Global Surveyor Thermal Emission Spectrometer
J. Geophys. Res. Vol. 105 , No. E4 , p. 9643

At any rate, refer to my post below regarding TES and bolometric measurements during periods of high dust loading (i.e., southern spring and summer), which was the case over the southern hemisphere as depicted in the graphical plot at