Instrument : Aerosol Chemical Speciation Monitor (ACSM)

Instrument Categories

The Aerosol Chemical Speciation Monitor is a thermal vaporization, electron impact ionization mass spectrometer that measures bulk chemical composition of the non-refractory component of sub-micron aerosol particles in real time with typically 30-minute integration period. Standard derived quantities are the mass-concentrations in ug/m^3 of organics, sulfate, nitrate, ammonium, and chloride.

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

Output Datastreams

  • aosacsm : AOS: aerosol chemical speciation monitor

Primary Measurements

The following measurements are those considered scientifically relevant.


Eastern North Atlantic
ENAC1Browse DataGraciosa Island, Azores, Portugal
Southern Great Plains
SGPC1Browse DataCentral Facility, Lamont, OK
ARM Mobile Facility
MAOS1Browse DataManacapuru, Amazonas, Brazil; MAOS
PVCS1Browse DataHighland Center, Cape Cod MA; MAOS

See Also


Thomas Watson
(631) 344-4517

Stephen Springston
(631) 344-4477

Bill Behrens
(631) 344-2906