About
The Beyond Cloudlab project builds on targeted cloud seeding experiments conducted within Cloudlab, which investigated the microphysical response of wintertime stratus clouds to the introduction of ice-nucleating particles (INPs). Beyond Cloudlab expands this framework by integrating detailed chemical characterization of cloud-derived samples to better constrain aerosol–cloud interactions and tracer incorporation processes. The project is a collaboration between ETH Zürich, the Laboratory of Atmospheric Chemistry at PSI, and the University of Oslo. The wintertime stratus clouds at the Eriswil (BE), Switzerland, field site provide a “natural laboratory” where controlled seeding experiments can be conducted under stable atmospheric conditions.
Our Contribution
At the Laboratory of Atmospheric Chemistry at PSI, we contribute to the Beyond Cloudlab project through the detailed chemical characterization of cloud-derived samples and background snow collected during the winter campaign. This involves developing and adapting analytical methods for low-concentration samples and performing offline analyses with techniques such as ion chromatography (IC), total organic carbon analysis (TOC), and mass spectrometry (MS/HRMS). These analyses aim to identify chemical signatures of seeding material, distinguish them from background aerosol contributions, and support the interpretation of observed microphysical changes. Moreover, initial steps are being taken toward in situ sampling of cloud water droplets and ice crystals using the tethered balloon system.
To learn more about the Cloudlab project, please visit the project homepage: https://cloudlab.ethz.ch/
