Abstract
Observations by the Viking Orbiters and Landers have made substantial contributions to our understanding of the episodic, planetary-scale dust storms on Mars. These and other observations pertinent to the great dust storms are reviewed in this paper; most of the emphasis is on the atmospheric/climatic aspects of these great storms. Specifically, observations concerning the optical properties of the airborne dust, the frequency of occurrence of great dust storms, and the kinematics of their evolution are summarized. Special attention is given to the various estimates derived from Viking data of atmospheric dust opacity. Within this observational framework, various physical mechanisms underlying the generation, evolution, and decay of the Martian great dust storms are discussed.
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