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This paper presents results of the extensive field campaign CLACE 2010 (Cloudand Aerosol Characterization Experiment) performed in summer 2010 at theJungfraujoch (JFJ) and the Kleine Scheidegg (KLS) in the Swiss Alps. The maingoal of this campaign was to investigate the vertical variability of aerosoloptical properties around the JFJ and to show the consistency of thedifferent employed measurement techniques considering explicitly the effectsof relative humidity (RH) on the aerosol light scattering. Various aerosoloptical and microphysical parameters were recorded using in-situ and remotesensing techniques. In-situ measurements of aerosol size distribution, lightscattering, light absorption and scattering enhancement due to water uptakewere performed at the JFJ at 3580 m a.s.l.. A unique set-up allowed remotesensing measurements of aerosol columnar and vertical properties from the KLSlocated about 1500 m below and within the line of sight to the JFJ(horizontal distance of approx. 4.5 km). In addition, two satelliteretrievals from the Spinning Enhanced Visible and Infrared Imager (SEVIRI)and the Moderate Resolution Imaging Spectroradiometer (MODIS) as well as backtrajectory analyses were added to the comparison to account for a widergeographical context. All in-situ and remote sensing measurements were inclear correspondence. The ambient extinction coefficient measured in situ atthe JFJ agreed well with the KLS-based LIDAR (Light Detection and Ranging)retrieval at the altitude-level of the JFJ under plausible assumptions on theLIDAR ratio. However, we can show that the quality of this comparison isaffected by orographic effects due to the exposed location of the JFJ on asaddle between two mountains and next to a large glacier. The local RH aroundthe JFJ was often higher than in the optical path of the LIDAR measurement,especially when the wind originated from the south via the glacier, leadingto orographic clouds which remained lower than the LIDAR beam. Furthermore,the dominance of long-range transported Saharan dust was observed in allmeasurements for several days, however only for a shorter time period in thein-situ measurements due to the vertical structure of the dust plume. Theoptical properties of the aerosol column retrieved from SEVIRI and MODISshowed the same magnitude and a similar temporal evolution as themeasurements at the KLS and the JFJ. Remaining differences are attributed tothe complex terrain and simplifications in the aerosol retrieval scheme ingeneral

Spatial variation of aerosol optical properties around the high-alpine site Jungfraujoch (3580 m a.s.l.)