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Wave-Modified Flux and Plume Dispersion in the Stable Boundary Layer

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Abstract

The effects of a pressure jump and a following internal gravity wave on turbulence and plume diffusion in the stable planetary boundary layer are examined. The pressure jump was accompanied by a sudden increase in turbulence and plume dispersion. The effects of wave perturbations on turbulence statistics are analysed by calculating fluxes and variances with and without the wave signal for averaging times ranging from 1 to 30 min. The wave signals are obtained using a band-pass filter. It is shown that second-order turbulence quantities calculated without first subtracting the wave perturbations from the time are greater than those calculated when the wave signal is separated from the turbulence. Estimates of the vertical dispersion of an elevated tracer plume in the stable boundary layer are made using an elastic backscatter lidar. Plume dispersion observed 25 m downwind of the source increases rapidly with the arrival of the flow disturbances. Measured plume dispersion and plume centreline height correlate with the standard deviation of the vertical velocity but not with the wave signal.

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Authors and Affiliations

  1. CJN Research Meteorology, Knoxville, TN, 37919, USA

    C. J. Nappo

  2. University of Connecticut, Storrs, CT, USA

    D. R. Miller

  3. Louisiana State University, Baton Rouge, LA, USA

    A. L. Hiscox

Authors
  1. C. J. Nappo
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  2. D. R. Miller
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  3. A. L. Hiscox
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Correspondence to C. J. Nappo.

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Nappo, C.J., Miller, D.R. & Hiscox, A.L. Wave-Modified Flux and Plume Dispersion in the Stable Boundary Layer. Boundary-Layer Meteorol 129, 211–223 (2008). https://doi.org/10.1007/s10546-008-9315-9

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  • DOI: https://doi.org/10.1007/s10546-008-9315-9

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