aps: Aerodynamic Particle Sizer

The Aerodynamic Particle Sizer (APS) is a particle size spectrometer that measures both the particle aerodynamic diameter based on particle time-of-flight and optical diameter based on scattered light intensity. The APS provides the number size distribution for particles with aerodynamic diameters from 0.5 to 20 micrometers and with optical diameters from 0.3 to 20 micrometers.

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



  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Varble A, S Nesbitt, P Salio, E Zipser, S van den Heever, G McFarquhar, P DeMott, S Kreidenweis, M Jensen, P Kollias, D Romps, K Rasmussen, R Houze, Jr, R Leung, D Gochis, E Avila, CR Williams, and P Borque. 2018. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Science Plan. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-18-027.

Varble A, S Nesbit, P Salio, E Zipser, S van den Heever, G McFarquhar, P Kollias, S Kreidenweis, P DeMott, M Jensen, R Houze, Jr., K Rasmussen, R Leung, D Romps, D Gochis, E Avila, and C Williams. 2018. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Science Plan. Ed. by Robert Stafford, DOE ARM Climate Research Facility. DOE/SC-ARM-17-004.

Pekour MS and LK Berg. 2018. Aerosol and Cloud Experiments in the Eastern North Atlantic (ACE-ENA) Winter Intensive Operational Period: Aerodynamic Particle Sizer Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-18-025.


Kassianov E, M Pekour, C Flynn, L Berg, J Beranek, A Zelenyuk, C Zhao, L Leung, P Ma, L Riihimaki, J Fast, J Barnard, A Hallar, I McCubbin, E Eloranta, A McComiskey, and P Rasch. 2017. "Large Contribution of Coarse Mode to Aerosol Microphysical and Optical Properties: Evidence from Ground-based Observations of a Trans-Pacific Dust Outbreak at a High-Elevation North American Site." Journal of the Atmospheric Sciences, 74(5), 10.1175/JAS-D-16-0256.1.
Research Highlight


Cappa CD, KR Kolesar, X Zhang, DB Atkinson, MS Pekour, RA Zaveri, A Zelenyuk, and Q Zhang. 2016. "Understanding the optical properties of ambient sub- and supermicron particulate matter: results from the CARES 2010 field study in northern California." Atmospheric Chemistry and Physics, 16(10), 10.5194/acp-16-6511-2016.


Atkinson DB, JG Radney, J Lum, KR Kolesar, DJ Cziczo, MS Pekour, Q Zhang, A Setyan, A Zelenyuk, and CD Cappa. 2015. "Aerosol optical hygroscopicity measurements during the 2010 CARES campaign." Atmospheric Chemistry and Physics, 15(8), 10.5194/acp-15-4045-2015.


Collins D. 2010. Tandem Differential Mobility Analyzer/Aerodynamic Particle Sizer (APS) Handbook. DOE/SC-ARM-TR-090.


Ghan S and SE Schwartz. 2007. "Aerosol Properties and Processes: A Path from Field and Laboratory Measurements to Global Climate Models." Bulletin of the American Meteorological Society, 88(7), 10.1175/bams-88-7-1059.


Orsini DA, Y Ma, A Sullivan, B Sierau, K Baumann, and RJ Weber. 2003. "Refinements to the particle-into-liquid sampler (PILS) for ground and airborne measurements of water soluble aerosol composition." Atmospheric Environment, 37(9-10), 10.1016/s1352-2310(02)01015-4.


McMurry PH. 2000. "A review of atmospheric aerosol measurements." Atmospheric Environment, 34(12-14), 10.1016/s1352-2310(99)00455-0.

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