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

Active Instrument Locations

Facility Name Instrument Start Date
Graciosa Island, Azores, Portugal 2010-07-05


Zheng G, A Sedlacek, A Aiken, Y Feng, T Watson, S Raveh-Rubin, J Uin, E Lewis, and J Wang. 2020. "Long-range transported North American wildfire aerosols observed in marine boundary layer of eastern North Atlantic." Environment International, 139, 10.1016/j.envint.2020.105680.

Iguchi T, S Rutledge, W Tao, T Matsui, B Dolan, S Lang, and J Barnum. 2020. "Impacts of aerosol and environmental conditions on maritime and continental deep convective systems using a bin microphysical model." Journal of Geophysical Research: Atmospheres, 125(12), e2019JD030952, 10.1029/2019JD030952.

Abel S, P Barrett, P Zuidema, J Zhang, M Christensen, F Peers, J Taylor, I Crawford, K Bower, and M Flynn. 2020. "Open cells exhibit weaker entrainment of free-tropospheric biomass burning aerosol into the south-east Atlantic boundary layer." Atmospheric Chemistry and Physics, 20(7), 10.5194/acp-20-4059-2020.

Glenn I, G Feingold, J Gristey, and T Yamaguchi. 2020. "Quantification of the Radiative Effect of Aerosol-Cloud-Interactions in Shallow Continental Cumulus Clouds." Journal of the Atmospheric Sciences, 77(8), 10.1175/JAS-D-19-0269.1.

Marchand R. 2020. Macquarie Island Cloud and Radiation Experiment (MICRE) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-20-005.

Lubin D, D Zhang, I Silber, R Scott, P Kalogeras, A Battaglia, D Bromwich, M Cadeddu, E Eloranta, A Fridlind, A Frossard, K Hines, S Kneifel, W Leaitch, W Lin, J Nicolas, H Powers, P Quinn, P Rowe, L Russell, S Sharma, J Verlinde, and A Vogelmann. 2020. "AWARE: The Atmospheric Radiation Measurement (ARM) West Antarctic Radiation Experiment." Bulletin of the American Meteorological Society, 101(7), 10.1175/BAMS-D-18-0278.1.


Shen Y, A Virkkula, A Ding, K Luoma, H Keskinen, P Aalto, X Chi, X Qi, W Nie, X Huang, T Petäjä, M Kulmala, and V Kerminen. 2019. "Estimating cloud condensation nuclei number concentrations using aerosol optical properties: role of particle number size distribution and parameterization." Atmospheric Chemistry and Physics, 19(24), 10.5194/acp-19-15483-2019.

Gristey J, G Feingold, I Glenn, K Schmidt, and H Chen. 2019. "Surface Solar Irradiance in Continental Shallow Cumulus Fields: Observations and Large Eddy Simulation." Journal of the Atmospheric Sciences, 77(3), 10.1175/JAS-D-19-0261.1.

Yang F, R McGraw, E Luke, D Zhang, P Kollias, and A Vogelmann. 2019. "A new approach to estimate supersaturation fluctuations in stratocumulus cloud using ground-based remote-sensing measurements." Atmospheric Measurement Techniques, 12(11), 10.5194/amt-12-5817-2019.
Research Highlight

Varble A, S Nesbitt, P Salio, E Avila, P Borque, P DeMott, G McFarquhar, S van den Heever, E Zipser, D Gochis, R Houze, M Jensen, P Kollias, S Kreidenweis, R Leung, K Rasmussen, D Romps, and C Williams. 2019. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-19-028.

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