An investigation of ozone and planetary boundary layer dynamics over the complex topography of Grenoble combining measurements and modeling

[摘要] This paper concerns an evaluation of ozone(O₃) and planetary boundary layer (PBL) dynamics over the complex topography of the Grenoble region through a combination ofmeasurements and mesoscale model (METPHOMOD) predictions for three days, during July1999. The measurements of O₃ and PBL structure were obtained with a DifferentialAbsorption Lidar(DIAL) system, situated 20 km south of Grenoble at Vif(310 m ASL). The combined lidar observations and model calculations are in good agreement with atmosphericmeasurements obtained with an instrumented aircraft (METAIR). Ozone fluxes werecalculated using lidar measurements of ozone vertical profiles concentrations and thehorizontal wind speeds measured with a Radar Doppler wind profiler (DEGREANE. Theozone flux patterns indicate that the diurnal cycle of ozone production is controlled by localthermal winds. The convective PBL maximum height was some 2700 m above the landsurface while the nighttime residual ozone layer was generally found between 1200 and2200 m. Finally we evaluate the magnitude of the ozone processes at different altitudes in order toestimate the photochemical ozone production due to the primary pollutants emissions ofGrenoble city and the regional network of automobile traffic.

[学科分类] 大气科学