Mathematics – Probability
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p21b..02k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P21B-02
Mathematics
Probability
5405 Atmospheres (0343, 1060), 5410 Composition (1060, 3672), 6225 Mars
Scientific paper
There is a significant progress in the observational data on Mars photochemistry in the current decade. These data are not covered by and sometimes disagree with the published models. Therefore three types of models have been developed to study Mars photochemistry. A steady-state model for global-mean conditions is currently the only way to calculate the abundances of long living species (H2, O2, and CO). Our models involve heterogeneous loss of odd hydrogen on water ice aerosol. The model with heterogeneous loss probabilities of 0.01 for H, 1 for OH, 0.1 for HO2, and 1.5×10-4 for H2O2 results in the CO and O2 mixing ratios of 8.4×10-4 and 1.4× 10-3, respectively, in accord with the observations. The second type of the calculated models is steady-state models for local conditions. The MGS/TES data on temperature profiles, H2O, and dust are input parameters for these models. The calculations have been made for nine seasonal points spread over the martian year and for thirteen latitudes with a step of 10° for each season. The only adopted heterogeneous reaction is a weak loss of H2O2 on water ice with probability of 5× 10-4. The results are in good agreement with the recent observations of the O2 dayglow at 1.27 μm and the O3 and H2O2 abundances. Global maps of the seasonal and latitudinal behavior of these species have been made. The third type of models is a time-dependent model for local conditions. These models show that odd hydrogen quickly converts to H2O2 at the nighttime and the chemistry is switched off while the association of O, the heterogeneous loss of H2O2, and eddy diffusion continue. This requires significant changes in the global-mean and local steady-state models discussed above, and these changes have been properly done. The calculated diurnal variations of Mars photochemistry are discussed. The martian photochemistry at low and middle latitudes is significantly different in the aphelion period at LS = 10 to 130° from that in the remaining part of the year.
No associations
LandOfFree
Photochemistry of the Martian Atmosphere: Global Model and Seasonal, Latitudinal, and Diurnal Variations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Photochemistry of the Martian Atmosphere: Global Model and Seasonal, Latitudinal, and Diurnal Variations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photochemistry of the Martian Atmosphere: Global Model and Seasonal, Latitudinal, and Diurnal Variations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1024900