Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p22a..07p&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #P22A-07
Physics
0300 Atmospheric Composition And Structure, 0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0325 Evolution Of The Atmosphere (1610, 8125), 0343 Planetary Atmospheres (5210, 5405, 5704)
Scientific paper
Satellite measurements of the terrestrial nightside mesosphere from the MLS/Aura MLS instrument show a layer of OH near 82 km. This layer confirms earlier measurements by ground-based UVFTS. The MLS and UVFTS observations measure OH in the lowest vibrational state and are distinct, but related chemically, from vibrationally-excited emission from the OH Meinel bands in the near infrared. The Caltech 1-D KINETICS model has been extended to include vibrational dependence of OH reactions and shows good agreement with MLS OH data and with observations of the Meinel bands [1]. The model shows a chemical lifetime of HOx that increases from less than a day at 80 km to over a month at 87 km. Above this altitude transport processes become an im-portant part of HOx chemistry. The model predicts that ground state OH represents 99% of the total OH up to 84 km. Similarly, Venus airglow emissions detected at wavelengths of 1.40 to 1.49 and 2.6 to 3.14 μm in limb observations by the Visible and Infrared Thermal Imaging Spectrometer (VIRTIS) on the Venus Express spacecraft are attributed to the OH Meinel band transitions as well [2]. The integrated emission rates for the OH Meinel bands were measured to be 100±40 and 880±90 kR respectively, both peaking at an altitude of 96±2 km near midnight local time for the considered orbit. We use the same Caltech 1-D KINETICS model to model these observations for Venus as was used for the Earth [1] and discuss the conclusions from a comparative planetology perspec-tive, highlighting the similarities and differences between Venus and Earth. References: [1] Pickett H. M., Read W. G., Lee K. K. and Yung Y. L. (2006) GRL, 33, L19808. [2] Piccioni G., Drossart P., Zasova L., Migliorini A., Gérard J.-C., Mills F. P., Shakun A., Garcia Munoz A., Ignatiev N., Grassi D., Cottini V., Taylor F. W., Erard S., and the VIRTIS-Venus Express Technical Team (2008) A and A., 483, L29-L33.
Bougher Stephen
Brecht Amanda
Parkinson Christopher D.
Yung Yuk L.
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