Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

ccnsmpskappa > CCN Counter and SMPS derived hygroscopicity parameter kappaVAP Type(s) > Baseline • Evaluation

The Cloud Condensation Nuclei (CCN) Counter and Scanning Mobility Particle Sizer (SMPS) Derived Hygroscopicity Parameter Kappa (CCNSMPSKAPPA) value-added product uses measurements from CCN counter and SMPS instruments. The particle size distribution was integrated from the largest particle size toward smaller particle size until the total number of particles was equal to the CCN number. The particle size at which CCN and size distribution concentrations are equal is called the critical diameter, and for each critical diameter value, a single hygroscopicity parameter kappa using well-established kappa-Köhler theory was calculated (Petters and Kreidenweis 2007). The kappa values are calculated at each different water supersaturation value (0.1 to 1.0%).

Reference: Petters MD and SM Kreidenweis. 2007. “A single parameter representation of hygroscopic growth and cloud condensation nucleus activity.” Atmospheric Chemistry and Physics, 7, 1961–1971,


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Active Locations

Facility Name Start Date
Lamont, OK (Extended and Co-located with C1) 2017-04-12


Wainwright C, R Chang, and D Richter. 2021. "Aerosol activation in radiation fog at the Atmospheric Radiation Program Southern Great Plains site." Journal of Geophysical Research: Atmospheres, 126(22), e2021JD035358, 10.1029/2021JD035358.

Kulkarni GR, MS Levin, and JE Shilling. 2021. Cloud Condensation Nuclei Hygroscopicity Value-Added Product Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-272. 10.2172/1818210.

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