Instrument : Particle Soot Absorption Photometer (PSAP)

Instrument Categories

A particle soot absorption photometer collects aerosol particles on a substrate and measures the change in light transmission relative to a reference filter. Bulk particle absorption is derived after correcting for scattering effects.

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

Output Datastreams

  • aospsap3w : AOS: 3 wavelength Particle Soot Absorption Photometer
  • aospsap3w1m : AOS: 3 wavelength Particle Soot Absorption Photometer 1 minute averages
  • aospsap3w1s : AOS: 3 wavelength Particle Soot Absorption Photometer 1 second averages
  • aostap : AOS: Tri-color Absorption Photometer

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)
Southern Great Plains
SGPC1 Browse DataCentral Facility, Lamont, OK
SGPS01 Browse DataSupplemental 1, Lamont, OK
ARM Mobile Facility
ACXM1 Browse Data Browse PlotsOff the Coast of California - NOAA Ship Ronald H. Brown; AMF2
ASIM1 Browse DataAscension Island, South Atlantic Ocean; AMF1
AWRM1 Browse DataMcMurdo Station Ross Ice Shelf, Antarctica; AMF2
MAGM1 Browse Data Browse PlotsLos Angeles, CA to Honolulu, HI - container ship Horizon Spirit; AMF2 retired
MAOM1 Browse DataManacapuru, Amazonas, Brazil; AMF1
OLIM1 Browse DataOlikiok Point, Alaska; AMF3
PGHM1 Browse Data Browse PlotsARIES Observatory, Nainital, Uttarkhand, India; AMF1 retired
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF1
SBSS2 Browse DataSteamboat 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


Cynthia Salwen
Brookhaven National Laboratory

Stephen Springston
Brookhaven National Laboratory
(631) 344-4477

Anne Jefferson
(303) 497-6493

Arthur Sedlacek
Brookhaven National Laboratory
(631) 344-2404