Development of the Horizontal Cloud Condensation Nuclei Counter (HCCNC) to detect particle activation down to 4&thinsp;°C temperature and 0.05&thinsp;% supersaturation

Sapkal, Mayur G.; Rösch, Michael; Kanji, Zamin A.

doi:https://doi.org/10.5194/amt-18-5649-2025

Articles | Volume 18, issue 20

https://doi.org/10.5194/amt-18-5649-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/amt-18-5649-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 20

Research article

|

21 Oct 2025

Research article |

| 21 Oct 2025

Development of the Horizontal Cloud Condensation Nuclei Counter (HCCNC) to detect particle activation down to 4 °C temperature and 0.05 % supersaturation

Mayur G. Sapkal, Michael Rösch, and Zamin A. Kanji

Data sets

Development of the Horizontal Cloud Condensation Nuclei Counter (HCCNC) to detect particle activation down to 4 °C temperature and 0.05 % supersaturation Mayur G. Sapkal et al. https://doi.org/10.3929/ethz-b-000749284

Short summary

The newly developed Horizontal Cloud Condensation Nuclei Counter (HCCNC) is capable of generating supersaturation as low as 0.05 % at temperatures as low as 4 °C, allowing for the investigation of CCN activity of ammonium sulfate particles up to 200 nm diameter and ambient aerosol of larger diameter. The HCCNC could be used for low-temperature experiments where gas-phase partitioning into or out of the aerosol phase for semi-volatile compounds is relevant for CCN activity.