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A Simulative Model of Dryline Motion

Joseph T. SchaeferNational Severe Storms Laboratory, NOAA, Norman, Okla. 73069

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Abstract

A dryline is a narrow zone, other than a classical polar front, across which a sharp horizontal surface moisture gradient occurs. It often exists and moves under synoptically quiescent conditions. One explanation of dryline motion is that it is caused by turbulent vertical mixing. A slab symmetric numerical model of the boundary layer is developed to test this hypothesis. This model, when applied to a typical dryline environment, produces dryline motions similar to those observed in the atmosphere. The model is applied to several real dryline cases, and a close correspondence between simulated and observed motions are found. It is concluded that vertical mixing is the primary cause of dryline motion.

Abstract

A dryline is a narrow zone, other than a classical polar front, across which a sharp horizontal surface moisture gradient occurs. It often exists and moves under synoptically quiescent conditions. One explanation of dryline motion is that it is caused by turbulent vertical mixing. A slab symmetric numerical model of the boundary layer is developed to test this hypothesis. This model, when applied to a typical dryline environment, produces dryline motions similar to those observed in the atmosphere. The model is applied to several real dryline cases, and a close correspondence between simulated and observed motions are found. It is concluded that vertical mixing is the primary cause of dryline motion.

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