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Seasonal/Diurnal Mapping of Ozone and Water in the Martian AtmosphereOzone and water are key species for understanding the stability and evolution of Mars atmosphere; they are closely linked (along with CO, H, OH, and O) through photochemistry. Photolysis of water produces the OH radical (thought to catalyze reformation of CO2 from CO and O2) and atomic hydrogen (which reacts with O3 forming OH and O2). Atomic hydrogen also reacts with O2 (forming HO2), thereby reducing the amount of O2 available to reform O3 from collisions between O and O2. Hence ozone and water should be anti-correlated on Mars. Photolysis of O3 produces O2(a(sup 1) delta g) with 90% efficiency, and the resulting emission band system near 1.27 mm traces the presence and abundance of ozone. This approach was initially used to study ozone on Earth and then applied to Mars. In 1997, we measured several lines of the O2(a(sup 1) delta g) emission using CSHELL at the NASA IRTF; the O2(a(sup 1) delta g) state is also quenched by collisions with CO2. This quenching dominates at lower altitudes so that the detected emissions are used to detect ozone column densities above ~20 km. The slit was positioned N-S along Mars' central meridian resulting in a one-dimensional map of ozone. Nearly simultaneous maps may be made of water using CSHELL by detecting the v1 fundamental band of HDO near 3.67 microns and using the D/H ratio for Mars. This technique was used by DiSanti and Mumma. With CSHELL, measurements for both O2(a(sup 1) delta g) emissions and HDO absorptions can be made during the day or night. Since January, 1997, we have repeated these measurements at different times during the Martian year. For all of these dates, we have positioned the slit N-S along the central meridian; for some of these dates, we have also stepped the slit across the planet at 1 arc-sec intervals generating a 2-dimensional map. We have also positioned the slit E-W on Mars thus providing diurnal variations of ozone and water along the slit.
Document ID
20030066803
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Novak, R. E.
(Iona College New Rochelle, New York, United States)
Mumma, M. J.
(Goddard Space Flight Center Greenbelt, Maryland, United States)
DiSanti, M. A.
(Goddard Space Flight Center Greenbelt, Maryland, United States)
DelloRusso, N.
(Catholic University of America Washington D.C., District of Columbia, United States)
Magee-Sauer, K.
(Rowan University Glassboro, New Jersey, United States)
Bonev, B.
(University of Toledo Toledo, Ohio, United States)
Date Acquired
August 21, 2013
Publication Date
July 25, 2003
Publication Information
Publication: Sixth International Conference on Mars
Publisher: LPI
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
3210
Meeting Information
Meeting: Sixth International Conference on Mars
Location: Pasadena, CA
Country: US
Start Date: July 20, 2003
End Date: July 25, 2003
Sponsors: Lunar and Planetary Institute
Funding Number(s)
PROJECT: RTOP 344-32-31
CONTRACT_GRANT: NSF AST-02-05397
CONTRACT_GRANT: NCC5-679
Distribution Limits
Public
Copyright
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