Instrument : Cloud Condensation Nuclei Particle Counter (CCN)

Instrument Categories
Aerosols, Airborne Observations

A cloud condensation nuclei counter consists of a flow column set up to create thermodynamically unstable controlled variable supersaturation conditions in the air sample stream and optically counts the particles that can form cloud droplets as a function of supersaturation.

The CCN is part of the Aerosol Observing System (AOS).

Output Datastreams

  • aosccn : Aerosol Observing System (AOS): cloud condensation nuclei data
  • aosccn100 : Aerosol Observing System (AOS): cloud condensation nuclei data
  • aosccn200 : AOS: Dual Column Cloud Condensation Nuclei Counter
  • noaaaosccn100 : Aerosol Observing System (AOS): cloud condensation nuclei data

Primary Measurements

The following measurements are those considered scientifically relevant.


Eastern North Atlantic
ENAC1Browse DataGraciosa Island, Azores, Portugal
North Slope Alaska
NSAX1Browse DataExternal Data (satellites and others)
Southern Great Plains
SGPC1Browse DataCentral Facility, Lamont, OK
ARM Mobile Facility
FKBM1Browse DataBlack Forest, Germany
GRWM1Browse DataGraciosa Island, Azores, Portugal
HFEM1Browse DataShouxian, Anhui, China
MAGM1Browse DataLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit
MAOM1Browse DataManacapuru, Amazonas, Brazil; AMF1
NIMM1Browse DataNiamey, Niger
PGHM1Browse DataARIES Observatory, Nainital, Uttarkhand, India
PVCM1Browse DataHighland Center, Cape Cod MA; AMF 1
PYEM1Browse DataPoint Reyes, CA
SBSS2Browse DataSteamboat Springs CO, Christie Peak
TMPS1Browse DataU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AOS

See Also


Gunnar Senum
(631) 344-3896

Stephen Springston
(631) 344-4477

Anne Jefferson
(303) 497-6493

Cynthia Salwen