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
ENAC1 Browse Data Browse PlotsGraciosa Island, Azores, Portugal
North Slope Alaska
NSAX1 Browse Data Browse PlotsExternal Data (satellites and others) retired
Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK
ARM Mobile Facility
ACXM1 Browse Data Browse PlotsOff the Coast of California - NOAA Ship Ronald H. Brown; AMF2
FKBM1 Browse DataBlack Forest, Germany retired
GRWM1 Browse DataGraciosa Island, Azores, Portugal retired
HFEM1 Browse DataShouxian, Anhui, China retired
MAGM1 Browse Data Browse PlotsLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit; AMF2 retired
MAOM1 Browse Data Browse PlotsManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse DataNiamey, Niger retired
PGHM1 Browse Data Browse PlotsARIES Observatory, Nainital, Uttarkhand, India retired
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF 1 retired
PYEM1 Browse DataPoint Reyes, CA retired
SBSS2 Browse Data Browse PlotsSteamboat Springs CO, Christie Peak retired
TMPS1 Browse Data Browse PlotsU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AOS
 retired = Originating instrument has been retired at this location

See Also


Anne Jefferson
(303) 497-6493

Gunnar Senum
Brookhaven National Laboratory
(631) 344-3896

Stephen Springston
Brookhaven National Laboratory
(631) 344-4477

Janek Uin
Brookhaven National Laboratory

Scott Smith
Brookhaven National Laboratory
(631) 344-7197

Cynthia Salwen
Brookhaven National Laboratory