In July and August 2023, two online ice nucleating particle (INP) instruments were running in parallel at the High Altitude Research Station Jungfraujoch in the Swiss Alps (3580 m a.s.l.). The station is part of the ACTRIS network and will become a National Facility of the ACTRIS Topical Center for Cloud In Situ (CIS) measurements. A key objective of CIS is to establish a European network for long-term measurements of INPs, an important variable for the weather and climate systems. Visit the ACTRIS CIS website for more information: https://www.actris.eu/topical-centre/cis.
To test their comparability under ambient sampling conditions, the Portable Ice Nucleation Chamber (PINE; Möhler et al., 2021) measured alongside the automated Horizontal Ice Nucleation Chamber (HINC-auto; Brunner and Kanji, 2021), an instrument that is in continuous operation at the Jungfraujoch research station. More of such pilot intercomparison studies will be conducted in 2024 as a start of the operational activities of the CIS unit CCIce (Center for Cloud Ice Nucleation).