Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

ccn > Cloud Condensation Nuclei Particle CounterInstrument Type(s) > Baseline • External • Guest

The cloud condensation nuclei counter measures the concentration of aerosol particles by drawing an air sample through a column with thermodynamically unstable supersaturated water vapor that can condense onto aerosol particles. Particles that are activated, i.e., grown larger in the process, are counted and sized by an optical particle counter (OPC). In this way the CCN measures activated ambient aerosol particle number concentration as a function of supersaturation.

ARM operates both one- and two-column versions of the CCN.


  • Fixed
  • AMF1
  • AMF2
  • AMF3


Dada L, H Angot, I Beck, A Baccarini, L Quéléver, M Boyer, T Laurila, Z Brasseur, G Jozef, G de Boer, M Shupe, S Henning, S Bucci, M Dütsch, A Stohl, T Petäjä, K Daellenbach, T Jokinen, and J Schmale. 2022. "A central arctic extreme aerosol event triggered by a warm air-mass intrusion." Nature Communications, 13(1), 5290, 10.1038/s41467-022-32872-2.

Patade S, D Waman, A Deshmukh, A Gupta, A Jadav, V Phillips, A Bansemer, J Carlin, and A Ryzhkov. 2022. "The influence of multiple groups of biological ice nucleating particles on microphysical properties of mixed-phase clouds observed during MC3E." Atmospheric Chemistry and Physics, 22(18), 10.5194/acp-22-12055-2022.

Giangrande S, J Comstock, S Collis, J Shilling, K Gaustad, K Kehoe, S Xie, and D Zhang. 2022. Translator Plan: A Coordinated Vision for Fiscal Years 2023-2025. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-22-003. 10.2172/1893730.

Borque P, A Varble, and J Hardin. 2022. "Peak Rain Rate Sensitivity to Observed Cloud Condensation Nuclei and Turbulence in Continental Warm Shallow Clouds During CACTI." Journal of Geophysical Research: Atmospheres, , e2022JD036864, 10.1029/2022JD036864. ACCEPTED.

Tang S, J Fast, K Zhang, J Hardin, A Varble, J Shilling, F Mei, M Zawadowicz, and P Ma. 2022. "Earth System Model Aerosol–Cloud Diagnostics (ESMAC Diags) package, version 1: assessing E3SM aerosol predictions using aircraft, ship, and surface measurements." Geoscientific Model Development, 15(10), 10.5194/gmd-15-4055-2022.
Research Highlight

View All Related Publications