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comparison of hipwac and mars express spicam observations of ozone on mars 2006-2008 and variation from 1993 irhs observationsOzone is a tracer of photochemistry in the atmosphere of Mars and an observable used to test predictions of photochemical models. We present a comparison of retrieved ozone abundances on Mars using ground-based infrared heterodyne measurements by NASA Goddard Space Flight Center's Heterodyne Instrument for Planetary Wind And Composition (HIPWAC) and space-based Mars Express Spectroscopy for the Investigation of the Characteristics of the Atmosphere of Mars (SPICAM) ultraviolet measurements. Ozone retrievals from simultaneous measurements in February 2008 were very consistent (0.8 microns-atm), as were measurements made close in time (ranging from less than 1 to greater than 8 microns-atm) during this period and during opportunities in October 2006 and February 2007. The consistency of retrievals from the two different observational techniques supports combining the measurements for testing photochemistry-coupled general circulation models and for investigating variability over the long-term between spacecraft missions. Quantitative comparison with ground-based measurements by NASA'GSFC's Infrared Heterodyne Spectrometer (IRHS) in 1993 reveals 2-4 times more ozone at low latitudes than in 2008 at the same season, and such variability was not evident over the shorter period of the Mars Express mission. This variability may be due to cloud activity.
Document ID
Document Type
Preprint (Draft being sent to journal)
Fast, Kelly E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kostiuk, Theodor
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lefevre, Frank
(Centre National de la Recherche Scientifique Paris, France)
Hewagama, Tilak
(Maryland Univ. College Park, MD, United States)
Livengood, Timothy A.
(Maryland Univ. College Park, MD, United States)
Delgado, Juan D.
(Maryland Univ. College Park, MD, United States)
Annen, John
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sonnabend, Guido
(Cologne Univ. Germany)
Date Acquired
August 24, 2013
Publication Date
January 1, 2009
Subject Category
Lunar and Planetary Science and Exploration
Funding Number(s)
Distribution Limits
Public Use Permitted.

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