Computer Science
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004icar..170..424e&link_type=abstract
Icarus, Volume 170, Issue 2, p. 424-429.
Computer Science
65
Mars, Atmosphere, Composition, Infrared Observations, Photochemistry
Scientific paper
Hydrogen peroxide (H2O2) has been suggested as a possible oxidizer of the martian surface. Photochemical models predict a mean column density in the range of 1015-1016 cm-2. However, a stringent upper limit of the H2O2 abundance on Mars (9×1014 cm-2) was derived in February 2001 from ground-based infrared spectroscopy, at a time corresponding to a maximum water vapor abundance in the northern summer (30 pr.μm, Ls=112°). Here we report the detection of H2O2 on Mars in June 2003, and its mapping over the martian disk using the same technique, during the southern spring (Ls=206°) when the global water vapor abundance was ~10 pr.μm. The spatial distribution of H2O2 shows a maximum in the morning around the sub-solar latitude. The mean H2O2 column density (6×1015 cm-2) is significantly greater than our previous upper limit, pointing to seasonal variations. Our new result is globally consistent with the predictions of photochemical models, and also with submillimeter ground-based measurements obtained in September 2003 (Ls=254°), averaged over the martian disk (Clancy et al., 2004, Icarus 168, 116-121).
Atreya Sushil K.
Bezard Bruno
Encrenaz Th.
Forget Francois
Greathouse Thomas K.
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