Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf...49k&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.49
Computer Science
Scientific paper
Extraction of methane on Mars from IRTF/CSHELL spectra has been significantly improved by comparison with the similar spectra of the Moon. Observations in February 2006 at LS = 10° along the central meridian at 63-93°W show ~8 ppb at 0-40°S and ~3 ppb outside this region. Observations in December 2009 at LS = 20° and 0-30°W reveal no methane with an upper limit of 8 ppb. No methane with the same upper limit was seen in March 2010 at LS = 70° on the martian disk in the scanning mode from 30°W to 90°E and along the central meridian. The measured methane abundances and upper limits are smaller than those in the PFS and TES maps. Our search for ethane at 2977 cm-1 results in an upper limit of 0.3 ppb on Mars, with improvement of the previous limit by three orders of magnitude. The observed ethane abundance in the Earth's atmosphere is 0.17 ppb and corresponds to CH4/C2H6 = 12,000.
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