In this post to sci.astro I discuss two reports, one by Nick Hoffman, that argue the Mars gullies are forming currently:

From: Robert Clark (rgregoryclark@yahoo.com)
Subject: Mars gullies forming currently?
Newsgroups: sci.astro, alt.sci.planetary, sci.physics, sci.geo.geology
Date: 2002-01-22 00:53:07 PST
http://groups.google.com/groups?th=77870473d53ce66e

Both use TES temperature readings of locations in the southern hemisphere to support their respective arguments.

In this post to sci.astro I speculate that dark spots seen in the Martian gullies could be due to cyanobacteria:

From: Robert Clark (rgclark@my-deja.com)
Subject: Dark spots in Mars gullies - evidence of cyanobacteria?
Newsgroups: sci.astro, sci.astro.seti, alt.sci.planetary, sci.bio.misc
Date: 2001-11-29 14:05:07 PST
http://groups.google.com/groups?th=b4c2374dcdf153f6

I wrote to one of the TES scientists who responded that in the image I cite the temperatures would be too low for liquid water as it is taken in late winter. However I noted that the region was brightly lit which suggests it was already during the time when the Sun is continuously above the horizon at this low southern latitude.
How do you find the TES temperature readings at this site at the time the picture was taken?

Mars planetary scientists have disputed Gil Levin's argument that liquid water could have formed at the Viking 2 lander site from the abundant frosts seen there. They argued that above freezing temperatures were not reached at this northern latitude, about 50 N.
I found a TES temperature map of the southern hemisphere that shows above zero temperatures can be reached as far south as 70 S:

South Polar Cap Recession
http://wwwflag.wr.usgs.gov/USGSFlag/Space/MGS_TES/spole99.html

However, you would expect the temperatures in the north to be somewhat lower since Mars is closer to the Sun during southern Summer than during northern Summer. How do you find the TES temperature readings of the Viking 2 landing site in the northern hemisphere?

Bob Clark