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Published June 25, 1993 | Published
Journal Article Open

Mars Dust Storms: Interannual Variability and Chaos

Abstract

The hypothesis is that the global climate system, consisting of atmospheric dust interacting with the circulation, produces its own interannual variability when forced at the annual frequency. The model has two time-dependent variables representing the amount of atmospheric dust in the northern and southern hemispheres, respectively. Absorption of sunlight by the dust drives a cross-equatorial Hadley cell that brings more dust into the heated hemisphere. The circulation decays when the dust storm covers the globe. Interannual variability manifests itself either as a periodic solution in which the period is a multiple of the Martian year, or as an aperiodic (chaotic) solution that never repeats. Both kinds of solution are found in the model, lending support to the idea that interannual variability is an intrinsic property of the global climate system. The next step is to develop a hierarchy of dust-circulation models capable of being integrated for many years.

Additional Information

© 1993 American Geophysical Union. (Received February 3, 1992; revised March 15, 1993; accepted March 17, 1993. The authors thank Richard Zurek for offering helpful suggestions and for making his paper with L. J. Martin available in advance of publication. This research was supported by the Mars Observer Project and by the NASA Planetary Atmospheres Program under grant NAGW-1956.

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