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Mars Ozone Absorption Line Shapes from Infrared Heterodyne Spectra Applied to GCM-Predicted Ozone Profiles and to MEX/SPICAM Column Retrievals
Author and Affiliation:
Fast, Kelly E.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Kostiuk, T.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Annen, J.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Hewagama, T.(Maryland Univ., MD, United States)
Delgado, J.(Maryland Univ., MD, United States)
Livengood, T. A.(Universities Space Research Association, United States)
Lefevre, F.(Paris VI Univ., Pierre et Marie Curie Univ., France)
Abstract: We present the application of infrared heterodyne line shapes of ozone on Mars to those produced by radiative transfer modeling of ozone profiles predicted by general circulation models (GCM), and to contemporaneous column abundances measured by Mars Express SPICAM. Ozone is an important tracer of photochemistry Mars' atmosphere, serving as an observable with which to test predictions of photochemistry-coupled GCMs. Infrared heterodyne spectroscopy at 9.5 microns with spectral resolving power >1,000,000 is the only technique that can directly measure fully-resolved line shapes of Martian ozone features from the surface of the Earth. Measurements were made with Goddard Space Flight Center's Heterodyne instrument for Planetary Wind And Composition (HIPWAC) at the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii on February 21-24 2008 UT at Ls=35deg on or near the MEX orbital path. The HIPWAC observations were used to test GCM predictions. For example, a GCM-generated ozone profile for 60degN 112degW was scaled so that a radiative transfer calculation of its absorption line shape matched an observed HIPWAC absorption feature at the same areographic position, local time, and season. The RMS deviation of the model from the data was slightly smaller for the GCM-generated profile than for a line shape produced by a constant-with-height profile, even though the total column abundances were the same, showing potential for testing and constraining GCM ozone-profiles. The resulting ozone column abundance from matching the model to the HIPWAC line shape was 60% higher than that observed by SPICAM at the same areographic position one day earlier and 2.5 hours earlier in local time. This could be due to day-to-day, diurnal, or north polar region variability, or to measurement sensitivity to the ozone column and its distribution, and these possibilities will be explored. This work was supported by NASA's Planetary Astronomy Program.
Publication Date: Oct 10, 2008
Document ID:
20080041547
(Acquired Oct 24, 2008)
Subject Category: SPACE SCIENCES (GENERAL)
Document Type: Conference Paper
Meeting Information: CIRS Team Meeting/AAS Division of Planetary Sciences Meeting; 10-15 Oct. 2008; Ithaca, NY; United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ATMOSPHERIC GENERAL CIRCULATION MODELS; HETERODYNING; PHOTOCHEMICAL REACTIONS; RADIATIVE TRANSFER; PLANETARY COMPOSITION; INFRARED RADIATION; ATMOSPHERIC COMPOSITION; INFRARED TELESCOPES; LINE SHAPE; VARIABILITY; ROOT-MEAN-SQUARE ERRORS
Availability Source: Other Sources
Availability Notes: Abstract Only
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