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Troposphere-Stratosphere Interactions in a One-Dimensional Model of Jovian Photochemistry

Landry, Bridget and Allen, Mark and Yung, Yuk L. (1991) Troposphere-Stratosphere Interactions in a One-Dimensional Model of Jovian Photochemistry. Icarus, 89 (2). pp. 377-383. ISSN 0019-1035. doi:10.1016/0019-1035(91)90184-U.

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A simple one-dimensional model of the Jovian atmosphere including the coupling between a rapidly mixed troposphere and a stagnant stratosphere is presented. We treat analytically the case of a chemically unreactive species flowing downward through the stratosphere and troposphere with a constant flux. The calculated concentration profile has a maximum value approximately one atmospheric scale height above the tropopause. The corresponding mixing ratio rapidly decreases in the lower stratosphere. The contrast between the peak stratosphere and tropopause concentrations reflects the variation between the lower stratosphere and upper troposphere eddy diffusion coefficients. Numerical simulations of unreactive CO and C_2H_6, considering high-altitude photochemical sources (yielding downward fluxes to the troposphere) and deep troposphere thermochemical sources, demonstrate that upper troposphere abundances may have a large photochemical contribution Recent observations of CO near 5 bar can be reproduced by a model using any one of three different tropospheric eddy diffusion profiles: a constant value of ∼ 10^8 cm^2 sec^(−1), a constant value of ≾10^4 cm^2 sec^(-1), or a two-layer model with a rapidly mixed (10^8 cm^2 sec^(−1)) layer below 20 bar and a slower mixing layer (10^4 cm^2 sec^(−1)) between 100 mbar and 20 bar. In the latter two scenarios, the photochemical source is an important and/or dominant source of upper tropospheric CO. However, the upper tropospheric C_2H_6 abundances are distinctly different among the three cases. These calculations suggest objectives for higher spectral resolution observations, critical vertical scales for planning experiments on future missions to Jupiter, and predictions that can be tested with the Galileo probe mass spectrometer.

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Yung, Yuk L.0000-0002-4263-2562
Additional Information:© 1991 by Academic Press Inc. Received April 9, 1990: revised September 4. 1990. Available online 14 October 2002. The assistance provided by R. Achterberg. D. Hunten, D. Strobel and M. Summers it gratefully acknowledged. The research was supported by NASA Grant NSG-7376 to the California Institute of Technology.
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Caltech Division of Geological and Planetary Sciences4716
Issue or Number:2
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Official Citation:Bridget Landry, Mark Allen, Yuk L. Yung, Troposphere-stratosphere interactions in a one-dimensional model of Jovian photochemistry, Icarus, Volume 89, Issue 2, February 1991, Pages 377-383, ISSN 0019-1035, (
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ID Code:48472
Deposited On:13 Aug 2014 16:06
Last Modified:10 Nov 2021 18:32

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