Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

Analysis and validation of ozone variability observed by lidar during the ESCOMPTE-2001 campaign

Abstract : An ozone lidar was successfully operated as a ground-based instrument during the ESCOMPTE experiment in June/July 2001. Ozone profiles were measured between 0.5 and 5 km. Moreover, simultaneous measurements of the lidar scattering ratio (SR) at 316 nm diagnosed the diurnal evolution of the PBL top. Comparison of this data set with in-situ measurements by ultralight aircraft (ULM) and balloon soundings supports the existence of well-defined layers over the whole altitude range. Differences between measurements techniques are not due to instrumental inaccuracies but point towards the existence of ozone plumes with sharp horizontal gradients. This is indeed supported by aircraft horizontal cross-section available twice a day at two different levels in the planetary boundary layer (PBL) and the free troposphere. Analysis of the ozone data set has shown a good correlation between surface meteorological conditions, surface ozone measurements and lidar ozone profiles in the PBL. Observed ozone maxima or minima are linked either to sea breeze circulation bringing polluted air masses over the lidar or synoptic flows bringing air with background O3 values into the region. The observed variability of the ozone field is very large over the whole altitude range. Although it is the result of local temporal variability and advection of spatial inhomogenities, the latter proved to be an important contribution
Complete list of metadata

https://hal.archives-ouvertes.fr/hal-00068432
Contributor : Catherine Cardon Connect in order to contact the contributor
Submitted on : Thursday, May 11, 2006 - 7:13:08 PM
Last modification on : Tuesday, November 16, 2021 - 4:48:56 AM

Links full text

Identifiers

Citation

Gérard Ancellet, François Ravetta. Analysis and validation of ozone variability observed by lidar during the ESCOMPTE-2001 campaign. Atmospheric Research, Elsevier, 2005, 74, pp.435-459. ⟨10.1016/j.atmosres.2004.10.003⟩. ⟨hal-00068432⟩

Share

Metrics

Record views

19