Aircraft measurement of ozone turbulent flux in the atmospheric boundary layer

In May 1995, the "Chimie-Creil 95" experiment was undertaken in the north o f France. The held data are first used to validate the methodology for airb orne measurement of ozone flux. A certain number of methodological problems due to the location of the fast ozone sensor inside the airplane are, furt hermore discussed. The paper describes the instrumentation of the ARAT (Avi on de Recherche Atmospherique et de Teledetection), an atmospheric research and remote-sensing aircraft used to perform the airborne measurements, the area flown over, the meteorological conditions and boundary layer stabilit y conditions. These aircraft measurements are then used to determine ozone deposition velocity and values are proposed for aerodynamic, bulk transfer coefficients (ozone and momentum). The paper also establishes the relations hip between the normalised standard deviation and stability parameters (z/L ) for ozone, temperature, humidity and vertical velocity. The laws obtained are then presented. (C) 1999 Elsevier Science Ltd. All rights reserved.