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Physics and Chemistry of Sulfur Lakes on Io

Lunine, Jonathan I. and Stevenson, David J. (1985) Physics and Chemistry of Sulfur Lakes on Io. Icarus, 64 (3). pp. 345-367. ISSN 0019-1035. https://resolver.caltech.edu/CaltechAUTHORS:20131113-141158674

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Abstract

A model for a convecting sulfur lake, heated from below by a silicate magma chamber, is constructed and applied to major hot spot regions on Jupiter's satellite Io. We use a two-layer parametrized convection scheme for sulfur and silicates based on a local boundary layer analysis to calculate temperature profiles in the system and the maximum flux which can be extracted from the silicate magma in steady state. The results indicate that the highest-component temperature of some observed hot spots (J. S. Pearl and W. M. Sinton, 1982, In The Satellites of Jupiter (D. Morrison, Ed.), pp. 724–755. Univ. of Arizona Press, Tucson) is consistent with a convecting molten sulfur system, and the total flux from the most energetic spot, Loki Patera, is close to the maximum which can be extracted from molten silicates by convection. Simple hydrodynamic models of evaporative outflow from sulfur lakes indicate that the intermediate-component temperature of hot spots such as Loki can be identified with the evaporative sulfur flux which condenses in the atmosphere and over a wide area surrounding the lake(s). The ratio of warm to hot component fluxes for Loki and other hot spots is consistent with this interpretation, and evaporation sets a strong constraint on the maximum surface temperature for a steady-state lake. The Voyager IRIS continuum spectrum can be fitted by a sulfur lake model in which sulfur vapor condensing on the shore is assumed to radiate as a blackbody. The lifetime of such a lake, in steady state, based on evaporation and silicate cooling time scales is 1–100 years, implying long-term Earth-based observations could detect variations in the Loki thermal output. The model provides a useful interpretive tool for possible variability because it gives predictions for the relative thermal fluxes at different wavelengths. The sodium-sulfur phase diagram is also presented and used to show the evaporated lakes may leave behind a sodium-rich residue which could supply the torus with sodium. Finally, uncertainties in the model are assessed, including the lack of sulfur emission features in the Loki spectrum, and the alternative possibility that the SO_2 plume observed at Loki could be supplying the excess thermal flux.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0019-1035(85)90060-0DOIArticle
http://www.sciencedirect.com/science/article/pii/0019103585900600PublisherArticle
ORCID:
AuthorORCID
Stevenson, David J.0000-0001-9432-7159
Additional Information:© 1985 Academic Press, Inc. Received March 18, 1985; revised October 28, 1985. We are most grateful to John Pearl for sending us printouts of the Voyager IRIS data, for a careful review of the manuscript, and for numerous and enjoyable discussions. Larry Soderblom's visit to Caltech as a Fairchild Scholar (1983-1984) and the "Io working group" at Caltech helped initiate this effort and maintain it through many stimulating meetings. The authors acknowledge support by NASA Grants NAGW-185 and NAGW-450. Jonathan I. Lunine was also supported by NASA Grant AST-8206173.
Funders:
Funding AgencyGrant Number
NASANAGW-185
NASANAGW-450
NSFAST-8206173
Issue or Number:3
Record Number:CaltechAUTHORS:20131113-141158674
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131113-141158674
Official Citation:Jonathan I. Lunine, David J. Stevenson, Physics and Chemistry of sulfur lakes on Io, Icarus, Volume 64, Issue 3, December 1985, Pages 345-367, ISSN 0019-1035, http://dx.doi.org/10.1016/0019-1035(85)90060-0. (http://www.sciencedirect.com/science/article/pii/0019103585900600)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42434
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Nov 2013 22:32
Last Modified:03 Oct 2019 05:58

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