Seasonal variations of hydrogen peroxide and water vapor on Mars: Further indications of heterogeneous chemistry

We have completed our seasonal monitoring of hydrogen peroxide and water vapor on Mars using ground-based thermal imaging spectroscopy, by observing the planet in March 2014, when water vapor is maximum, and July 2014, when, according to photochemical models, hydrogen peroxide is expected to be maxi...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2015-06, Vol.578, p.A127
Hauptverfasser: Encrenaz, T., Greathouse, T. K., Lefèvre, F., Montmessin, F., Forget, F., Fouchet, T., DeWitt, C., Richter, M. J., Lacy, J. H., Bézard, B., Atreya, S. K.
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container_title Astronomy and astrophysics (Berlin)
container_volume 578
creator Encrenaz, T.
Greathouse, T. K.
Lefèvre, F.
Montmessin, F.
Forget, F.
Fouchet, T.
DeWitt, C.
Richter, M. J.
Lacy, J. H.
Bézard, B.
Atreya, S. K.
description We have completed our seasonal monitoring of hydrogen peroxide and water vapor on Mars using ground-based thermal imaging spectroscopy, by observing the planet in March 2014, when water vapor is maximum, and July 2014, when, according to photochemical models, hydrogen peroxide is expected to be maximum. Data have been obtained with the Texas Echelon Cross Echelle Spectrograph (TEXES) mounted at the 3 m–Infrared Telescope Facility (IRTF) at Maunakea Observatory. Maps of HDO and H2O2 have been obtained using line depth ratios of weak transitions of HDO and H2O2 divided by CO2. The retrieved maps of H2O2 are in good agreement with predictions including a chemical transport model, for both the March data (maximum water vapor) and the July data (maximum hydrogen peroxide). The retrieved maps of HDO are compared with simulations by Montmessin et al. (2005, J. Geophys. Res., 110, 03006) and H2O maps are inferred assuming a mean martian D/H ratio of 5 times the terrestrial value. For regions of maximum values of H2O and H2O2, we derive, for March 1 2014 (Ls = 96°), H2O2 = 20+/−7 ppbv, HDO = 450 +/−75 ppbv (45 +/−8 pr-nm), and for July 3, 2014 (Ls = 156°), H2O2 = 30+/−7 ppbv, HDO = 375+/−70 ppbv (22+/−3 pr-nm). In addition, the new observations are compared with LMD global climate model results and we favor simulations of H2O2 including heterogeneous reactions on water-ice clouds.
doi_str_mv 10.1051/0004-6361/201425448
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subjects Clouds
Computer simulation
Hydrogen peroxide
Indication
Mars (planet)
planets and satellites: atmospheres
planets and satellites: individual: Mars
planets and satellites: terrestrial planets
Transportation models
Water vapor
title Seasonal variations of hydrogen peroxide and water vapor on Mars: Further indications of heterogeneous chemistry
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