A STUDY OF CONCENTRATION FLUCTUATIONS IN INSTANTANEOUS CLOUDS DISPERSING IN THE ATMOSPHERIC SURFACE LAYER FOR RELATIVE TURBULENT DIFFUSION: BASIC DESCRIPTIVE STATISTICS

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Authors
  1. Yee, E.
  2. Kosteniuk, P.R.
  3. Bowers, J.F.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
A series of tracer experiments studying the statistical properties of concentration fluctuations in clouds dispersing in the atmospheric surface layer is described and analyzed. Experiments were conducted at downwind fetches between about 200 and 1200 m, under a wide range of atmospheric conditions ranging from very unstable to moderately stable stratification. The present experiments have addressed basic requirements not met by past field experiments involving instantaneously released clouds; namely, the experiments provided repeat realization of instantaneously released clouds measured with high-resolution concentration detectors, accompanied by the contemporaneous acquisition of high-quality meteorological and turbulence measurements. Extensive analyses are performed on the cloud concentration data in the framework of relative diffusion. Ensembles of cloud concentration realizations have been constructed. From these ensembles, crosswind and time profiles of the ensemble-mean concentration, concentration variance, ensemble-mean dosage, and dosage variance are obtained. The behaviour of the time profiles of the integral time scale of cloud concentration fluctuations is studied. TRUNCATED
Keywords
Atmospheric dispersion models;Distribution functions;Cloud dispersion;Concentration fluctuations;Relative diffusion
Report Number
DRES-OL-98-007 — Reprint
Date of publication
04 Mar 1998
Number of Pages
52
Reprinted from
Boundary-Layer Meteorology, vol 87, 1998, p 409-457
DSTKIM No
98-02467
CANDIS No
509353
Format(s):
Hardcopy;Document Image stored on Optical Disk

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