A preliminary analysis of measurements from a near-field pollutants dispersion campaign in a stratified surface layer. (1st December 2014)

• Record Type: Journal Article
• Authors: Wei, Xiao; Dupont, Eric; Carissimo, Bertrand; Gilbert, Eric; Musson-Genon, Luc
• Is Part Of: International journal of environment and pollution. Volume 55:Number 1-4(2014)
• Page Start: 183
• Page End: 191
• Publication Date: 2014-12-01
• Subjects: atmospheric dispersion -- coherent structure -- sonic anemometer -- stable atmosphere -- turbulence; Environmental policy -- Periodicals; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Pollution -- Periodicals; 363.73
• Languages: English
• ISSNs: 0957-4352

Abstract

In order to study pollutants dispersion in a stably stratified surface layer at small scales, a pollutants dispersion field experiment programme is being conducted on the site SIRTA in the southern suburb of Paris. In a preliminary campaign held during the winter of 2012 with continuous gas releases, we had 12 ultrasonic anemometers measuring wind velocity and temperature at 10 Hz, and six photo-ionisation detectors measuring gas concentration at 50 Hz. Turbulence is verified to be anisotropic by calculating variances, integral length scales and power spectra of velocity. Some evidence of a –1 power law sub-range has been found in velocity power spectra. Also, we have deduced eddy advection velocity from spatial velocity cross-correlation and found it greater than mean wind speed measured directly by sensors. Concentration measurements are corrected by using a baseline method. Significant relationships between concentration and turbulence measurements at high frequency are still under further study.