Measurements of level-crossing statistics of concentration fluctuations in plumes dispersing in the atmospheric surface layer

Details Measurements of level-crossing statistics of concentration fluctuations in plumes dispersing in the atmospheric surface layer Measurements of level-crossing statistics of concentration fluctuations in plumes dispersing in the atmospheric surface layer

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995bolme..73...53y&link_type=abstract

Boundary-Layer Meteorology, Volume 73, Issue 1-2, pp. 53-90

Statistics

6

Scientific paper

The statistics of level crossings and local extremes in concentration fluctuations in plumes dispersing in the atmosphere have been investigated. A set of concentration fluctuation tracer experiments has been utilized to measure the statistical propertics of the upcrossing interval (inter-arrival time between consecutive concentration bursts), excursion duration (persistence or width of concentration bursts), and concentration amplitude (difference between the maximum and minimum concentrations between successive upcrossings) with respect to a range of concentration crossing levels. In particular, the effect of downwind distance and atmospheric stratification on the level-crossing statistics has been studied in detail. It is shown that the effect of increasing atmospheric stability on level-crossing statistics is similar to the effect of increasing distance from the source in the sense that level-crossing statistics of concentration fluctuations in stable stratification resemble those in neutral stratification, but at a greater downwind distance. It is also found that the distribution of the interval between consecutive upcrossings of a concentration level, as well as the duration of an excursion across a concentration level, can be approximated by a lognormal distribution, whereas the distribution of the concentration amplitude is best characterized by a gamma distribution. Some implications of these results for the modeling of level-crossing statistics of concentration fluctuations are discussed.

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