An interesting article:
http://mainlymartian.blogs.com/semijournal/2004/03/methane_and_thu.html
http://mainlymartian.blogs.com/semijournal/
Quote:
"Dick Kerr of Science magazine, who's been writing planetary science a good bit longer than most of us in this game, has a remarkable story up on the Science Now site -- something potentially far more striking than the crossbedding announcement. The team on the Mars Express Planetary Fourier Spectrometer (PFS) has announced the discovery of what look like methane absorption lines in the Martian atmosphere at 3.3 microns. Kerr quotes the PFS principal investigator, Vittorio Formisano saying it's "A very little amount," -- 10.5 parts per billion -- "but the result is clear." If this is indeed methane, then it's evidence that something is going on: either volcanic activity or life."
Far more important discovery than anything the MER's have found imho - this is the big one - there's not to many ways to generate methane at mars, modern day vulcanism seems unlikely - general outgassing a little more likely - but the most obivous answer is biomass.
Doug
A few more related links:
'Methane Means Martians?' - ScienceNOW (by subscription)
http://sciencenow.sciencemag.org/cgi/content/full/2004/324/1
'Does Methane Mean Life of the Red Planet?' - Discovery Channel
http://www.discoverychannel.ca/_home/science_popup1.shtml
Some earlier commentary re methane on Mars from ESA (no new info posted yet):
'Signatures of Life'
http://www.esa.int/SPECIALS/Mars_Express/SEMSL75V9ED_0.html
Two of the other non-ESA spectrometer studies (PDF files), the first from January 2004, the second from 1999 (page 3):
'Detection of Methane in the Martian Atmosphere: Evidence for Life' - Canada-France-Hawaii Telescope
http://www.cosis.net/abstracts/EGU04/06169/EGU04-A-06169.pdf
'High-Resolution Spectroscopy of Mars: Recent Results and Implications for Atmospheric Evolution' - Fifth Annual Mars Convention
http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ficm.conf.6016K&link_type=ARTICLE&db_key=AST
Please note I'm not saying this must be biological(!), but the scientists involved are apparently thinking either a geothermal or biological explanation, if the methane is being replenished somehow to the atmosphere as their findings seem to indicate. Either of those possibilities of course would be exciting.
Mars Express has also reportedly found sulphate deposits in Valles Marineris, similar to those at Meridiani, reported by the science team for the OMEGA Near-IR Mapping Spectrometer at the Lunar and Planetary Science conference last week, see comments section of the MainlyMartian web site (scroll down a few paragraphs):
http://mainlymartian.blogs.com/semijournal/2004/03/finding_haemati.html#comments
There's a little more about it here, includig 2 update articles:
http://mainlymartian.blogs.com/semijournal/
latest news story from BBC...
http://news.bbc.co.uk/2/hi/science/nature/3577551.stm
Says it was detected last year with two earth based IR telescopes.
Ahhhh.....I see the press are slowly atarting to pick up on this story.
so....why hasn't there been a press release by ESA yet?
here we go...
http://www.esa.int/export/esaCP/SEMZ0B57ESD_index_0.html
In another addition to the methane on Mars debate, researchers find methane-producing organisms in Mars-like, arid desert Earth soils:
http://www.eurekalert.org/pub_releases/2005-10/uosc-mfi103105.php
Volcanoes Ruled Out for Martian Methane
http://www.newscientistspace.com/article/dn8256-volcanoes-ruled-out-for-martian-methane.html
While the article confirms that the Martian CH4 isn't being produced by conventional volcanic reactions, note that it does nothing whatsoever to rule out the production of the methane by the "serpentinization" reaction, and in fact explicitly states at the end of the article that this is a major possibility. Indeed, it's been proposed for some time as the possible source not just of Mars' methane, but of the much larger amount at Titan.
A new, fairly short paper currently in press with Icarus:
Methane on Mars: A product of H2O photolysis in the presence of CO
Icarus, In Press, Corrected Proof, Available online 25 January 2006
Akiva Bar-Nun and Vasili Dimitrov
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WGF-4J440B5-2&_user=10&_handle=V-WA-A-W-VZ-MsSAYVW-UUW-U-AAVUYUCAVV-AABYBYCEVV-ZAWEAYUUV-VZ-U&_fmt=summary&_coverDate=01%2F25%2F2006&_rdoc=2&_orig=browse&_srch=%23toc%236821%239999%23999999999%2399999!&_cdi=6821&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=241c9ee7d36551861e609a6e3bd5cb1e
I KNEW you were on to something good there silylene!
There's probably room here for coming up with something analogous to the "John Smith, personal communication" type of reference you often see in published literature.
From the March 2006 issue of Geology:
Interglacial clathrate destabilization on Mars: Possible contributing source of its atmospheric methane
Olga Prieto-Ballesteros, et al.
Geology 34, 149–152 (2006).
http://www.gsajournals.org/gsaonline/?request=get-abstract&doi=10.1130%2FG22311.1
From the http://www.americanscientist.org/template/IssueTOC/issue/821:
Science Observer
Life on Mars?
by Martin Baucom
Geological and biological processes observed on Earth provide hunky-dory explanations for methane on Mars.
See http://www.americanscientist.org/template/AssetDetail/assetid/49613
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