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Abundances of Jupiter's Trace Hydrocarbons from Voyager and CassiniThe flybys of Jupiter by the Voyager spacecraft in 1979, and over two decades later by Cassini in 2000, have provided us with unique datasets from two different epochs, allowing the investigation of seasonal change in the atmosphere. In this paper we model zonal averages of thermal infrared spectra from the two instruments, Voyager 1 IRIS and Cassini CIRS, to retrieve the vertical and meridional profiles of temperature, and the abundances of the two minor hydrocarbons, acetylene (C2H2) and ethane (C2H6). The spatial variation of these gases is controlled by both chemistry and dynamics, and therefore their observed distribution gives us an insight into both processes, We find that the two gases paint quite different pictures of seasonal change. Whilst the 2-D cross-section of C2H6 abundance is slightly increased and more symmetric in 2000 (northern summer solstice) compared to 1979 (northern fall equinox), the major trend of equator to pole increase remains. For C2H2 on tile other hand, the Voyager epoch exhibits almost no latitudinal variation, whilst the Cassini era shows a marked decrease polewards in both hemispheres. At the present time, these experimental findings are in advance of interpretation, as there are no published models of 2-D Jovian seasonal chemical variation available for comparison.
Document ID
20110013469
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Nixon, C. A.
(Maryland Univ. College Park, MD, United States)
Achterberg, R. K.
(Maryland Univ. College Park, MD, United States)
Romani, P. N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Allen, M.
(California Inst. of Tech. Pasadena, CA, United States)
Zhang, X.
(California Inst. of Tech. Pasadena, CA, United States)
Teanby, N. A.
(Oxford Univ. Oxford, United Kingdom)
Irwin, P. G. J.
(Oxford Univ. Oxford, United Kingdom)
Flasar, F. M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
May 24, 2010
Publication Information
Publication: Planetary and Space Science
Volume: 58
Issue: 13
Subject Category
Lunar And Planetary Science And Exploration
Report/Patent Number
GSFC.JA.4465.2011
Distribution Limits
Public
Copyright
Other

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