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One-Particle, Two-Dimensional Effective Eddy Diffusivities from Balloon Trajectories

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  • 1 National Center for Atmospheric Research, Boulder, Colo. 80303
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Abstract

Trajectory data from the Eole balloon experiment are analyzed to determine the effective eddy diffusivity tensor for a particle advected by the horizontal components of the wind field. The data are used to construct a sample ensemble of 10-day trajectory records which are analyzed to estimate the one-time, first- and second-order Lagrangian position moments of one particle. The estimated moments are directly related to the components of the diffusivity tensor and other parameters needed to define the diffusion equation satisfied by the one-particle, probability density function. Zonal symmetry and linear modeling of meridional inhomogeneities are assumed.

Abstract

Trajectory data from the Eole balloon experiment are analyzed to determine the effective eddy diffusivity tensor for a particle advected by the horizontal components of the wind field. The data are used to construct a sample ensemble of 10-day trajectory records which are analyzed to estimate the one-time, first- and second-order Lagrangian position moments of one particle. The estimated moments are directly related to the components of the diffusivity tensor and other parameters needed to define the diffusion equation satisfied by the one-particle, probability density function. Zonal symmetry and linear modeling of meridional inhomogeneities are assumed.

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