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The planetary boundary layer (PBL) height is a key parameter in air qualitycontrol and pollutant dispersion. The PBL height cannot, however, be directlymeasured, and its estimation relies on the analysis of the vertical profilesof the temperature, turbulence or the atmospheric composition. Anoperational PBL height detection method including several remote sensinginstruments (wind profiler, Raman lidar, microwave radiometer) and severalalgorithms (Parcel and bulk Richardson number methods, surface-basedtemperature inversion, aerosol or humidity gradient analysis) was developedand tested with 1 year of measurements, which allows the methods to bevalidated against radio sounding measurements. The microwave radiometerprovides convective boundary layer heights in good agreement with the radiosounding (RS) (median bias < 25 m, <i>R</i><sup>2</sup> > 0.70) andallows the analysis of the diurnal variation of the PBL height due to itshigh temporal resolution. The Raman lidar also leads to a good agreementwith RS, whereas the wind profiler yields some more dispersed results mostlydue to false attribution problems. A comparison with the numerical weatherprediction model COSMO-2 has shown a general overestimation of the model PBLheight by some hundreds to thousand meters. Finally the seasonal cycles ofthe daytime and nighttime PBL heights are discussed for each instrument andeach detection algorithm for two stations on the Swiss plateau

atmospheric chemistry and physics

Determination and climatology of the planetary boundary layer height above the Swiss plateau by in situ and remote sensing measurements as well as by the COSMO-2 model