1,2,2,2,1,2,4,4,5,3,1,8,9,10,11,12,13,1,- 1Aarhus University, Department of Environmental Science, Department of Environmental Science, Roskilde, Denmark (ulas@envs.au.dk)
- 2Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
- 3Ecole Polytechnique Fédérale de Lausanne, Sion, Switzerland
- 4Foundation for Research and Technology Hellas (FORTH), Patras, Greece
- 5Department of Physics, National Technical University of Athens, Zografou, Greece
- 6Institute for Atmospheric and Earth System Research, University of Helsinki, Helsinki, Finland
- 7Leibniz Institute for Tropospheric Research (TROPOS), Leipzig, Germany
- 8Institute of Meteorology and Climatology, BOKU University, Vienna, Austria
- 9Aarhus University, Department of Chemistry, Aarhus, Denmark
- 10School of Engineering Sciences, Lappeenranta-Lahti University of Technology, Lappeenranta 53850, Finland
- 11Department for Atmosphere and Climate, NILU, Kjeller, Norway
- 12Leipzig Institute for Meteorology, Leipzig University, Leipzig, Germany
- 13Meteorological Institute of University of Hamburg, University of Hamburg, Hamburg, Germany
- *A full list of authors appears at the end of the abstract
The Arctic is warming up to 4 times faster than the global average, leading to rapid ice melting and consequently, a drastic change of the sources and processing of aerosols and their impact on clouds. Monitoring of these changes over the Arctic is extremely sparse, especially in the most remote regions where harsh conditions make it difficult to carry out even simple measurements. To address these knowledge gaps and develop better and new methods of remote sensing of aerosols and clouds, the CleanCloud project carried out the field campaign CLeancloud Arctic VIllum ExpeRiment (CLAVIER) at Villum Research Station (VRS) in northeast Greenland to study aerosol-cloud interaction (ACI) using in-situ surface and remote sensing as well as airborne measurements.
CLAVIER covered two phase; spring (April) and summer (July/August) 2024, each lasting for one month. We have employed the existing in-situ surface aerosol monitoring at VRS, which includes a Scanning Mobility Particle Sizer (SMPS), a Cloud Condensation Nuclei Counter (CCNC), a High-Volume Sampler (HVS), a Nephelometer, an Aethalometer, a Neutral cluster and Air Ion Spectrometer (NAIS), a wind lidar and a ceilometer. During CLAVIER, the site was additionally equipped with a AeRosol aerosol-cloud lIdar System (ARIS lidar) and a Wideband Integrated Bioaerosol Sensor (WIBS-5/NEO) to provide realtime measurement of aerosols and fluorescent particles to infer the presence of bioaerosols and their potential contribution to Ice Nucelating Particles (INP). In addition, a W-band Cloud Doppler Radar (WProf) and a tethered balloon (Helikite) was operated during the spring phase. The helikite was equipped with aerosol and cloud instrumentation, including a Portable Optical Particle Spectrometer (POPS), a Miniaturized Scanning Electrical Mobility Sizer (mSEMS), a Single-channel tricolor absorption photometer (STAP) and a miniaturized Cloud Droplet Analyzer (miniCDA), and a filter sampler with the new nano-electromechanical membrane FTIR (NEMS-FTIR) technique. A second tethered balloon was also employed for meteorological and flux measurements. In the summer phase, a Proton-Transfer-Reaction Mass Spectrometry (PTR-MS) was used to measure VOCs online and cartridge sampling was performed for offline sampling of VOCs, as well as a WELAS (white-light aerosol spectrometer) for size distribution of larger sizes and the newest aethalometer AE36s. Finally, summertime measurements were also coordinated with the NASA ARCSIX aircraft mission for clousure experiments.
In order to get a better understanding of the processes related to aerosol-cloud interactions, several modelling activities were and are being carried out for the CLAVIER period. These include the Flexible Particle Dispersion Model (FLEXPART), the WRF-SIP model to study in detail the secondary ice production in clouds, OpenIFSv48 global model to simulate the aerosol composition and forcing during the campaign, and finally, the FLEXPART-SOSAA framework and the ADCHEM model to study in detail the aerosol chemistry and impacts on CCN.
This presentation will provide an overview of these activities and some preliminary results.
Ulas Im, Alexis Berne, Radiance F.A. Calmer, Lionel Favre, Romanos Foskinis, Marilena Gidarakou, Sven-Erik Gryning, Varun Kumar, Andreas H. Massling, Athanasios Nenes, Alexandros Papayannis, Julia Schmale, Carl A. Svenhag, Lu Zhang, Michael Boy, Petri S. Clusius7, Robin W. de Jonge, Jenni Koykka, Nikolaos Evangeliou, Holger Siebert, Komal V. Navale, Silvia Henning, Michael Schafer, Henning Dorff, Mikko J. Sipila, Zihui Teng, Bernadette Rosati, Henrik Skov
How to cite: Im, U., Berne, A., Calmer, R. F. A., Favre, L., Foskinis, R., Massling, A. H., Nenes, A., Papayannis, A., Schmale, J., Zhang, L., Boy, M. H., Navale, K. V., Svenhag, C. A., Rosati, B., de Jonge, R. W., Koyyka, J., Teng, Z., Evangeliou, N., Dorff, H., and Skov, H. and the CLAVIER Team: Aerosol-cloud interactions over the high Arctic: CLeancloud Arctic VIllum ExpeRiment (CLAVIER) overview, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-9201, https://doi.org/10.5194/egusphere-egu26-9201, 2026.
