Abstract
Near-ground artificial cloud releases in the turbulent atmospheric boundary layer were investigated experimentally by Lidar measurement techniques. Simple scaling relations between the average concentration and the lowest order moments are suggested by simple analytical models, and the experimental results are tested against these hypotheses. We find strong evidence for a simple scaling of the standard deviation, skewness and kurtosis with the average concentrations at the downwind distances observed in our experiments. Near-ground concentration fluctuations in fixed as well as moving frames of references are investigated. The scaling is supported by data from several experimental sites and different atmospheric stability conditions. One conclusion of the study is that relatively accurate estimates for the standard deviation, skewness and kurtosis can be obtained for the concentration fluctuations, given a reliable estimate of the space-time varying average concentration field.
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Acknowledgements
We thank Søren Ott, Jan Trulsen and Bård Krane for valuable discussions, and Liv Larssen from the Auroral Observatory in Tromsø for her kind assistance in preparing Fig. 3. We also thank Dr. Leif Kristensen for his help in preparing the manuscript. One of the authors (HLP) was in part supported by the “Effects of North Atlantic Climate Variability on the Barents Sea Ecosystem” (ECOBE) project.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Jørgensen, H.E., Mikkelsen, T. & Pécseli, H.L. Concentration Fluctuations in Smoke Plumes Released Near the Ground. Boundary-Layer Meteorol 137, 345–372 (2010). https://doi.org/10.1007/s10546-010-9532-x
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DOI: https://doi.org/10.1007/s10546-010-9532-x