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The Daytime Evolution of the East African Jet

David M. RubensteinScience Applications. Inc., McLean, VA 22102

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Abstract

We present a combined observational and theoretical study of the daytime evolution of the equatorial East African low-level jet stream. During the daytime, as the flow advects from a suppressed marine environment across the East African coastline to an actively convective environment, a mixed layer grows in depth. Using measurements taken aboard a research aircraft, the turbulence flux profiles of heat and momentum are computed. These profiles are used to descriptively analyze the daytime evolution of the jet structure.

A nonlinear entrainment model is developed to describe the evolution of the mixed layer in both time and space. Sensitivity tests examine the relative importance of the factors that influence the character and growth of the mixed layer.

Abstract

We present a combined observational and theoretical study of the daytime evolution of the equatorial East African low-level jet stream. During the daytime, as the flow advects from a suppressed marine environment across the East African coastline to an actively convective environment, a mixed layer grows in depth. Using measurements taken aboard a research aircraft, the turbulence flux profiles of heat and momentum are computed. These profiles are used to descriptively analyze the daytime evolution of the jet structure.

A nonlinear entrainment model is developed to describe the evolution of the mixed layer in both time and space. Sensitivity tests examine the relative importance of the factors that influence the character and growth of the mixed layer.

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