aps > Aerodynamic Particle SizerInstrument Type(s) > Baseline • Guest

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

Active Locations

Facility Name Start Date
Houston, TX; AMF1 (main site for TRACER) 2021-09-08
Lamont, OK (Extended and Co-located with C1) 2016-11-15


Testa B, T Hill, N Marsden, K Barry, C Hume, Q Bian, J Uetake, H Hare, R Perkins, O Möhler, S Kreidenweis, and P DeMott. 2021. "Ice nucleating particle connections to regional Argentinian land surface emissions and weather during the Cloud, Aerosol, and Complex Terrain Interactions experiment." Journal of Geophysical Research: Atmospheres, 126(23), e2021JD035186, 10.1029/2021JD035186.

Wainwright C, R Chang, and D Richter. 2021. "Aerosol activation in radiation fog at the Atmospheric Radiation Program Southern Great Plains site." Journal of Geophysical Research: Atmospheres, 126(22), e2021JD035358, 10.1029/2021JD035358.

Subba T, M Lawler, and A Steiner. 2021. "Estimation of possible primary biological particle emissions and rupture events at the Southern Great Plains ARM site." Journal of Geophysical Research: Atmospheres, 126(16), e2021JD034679, 10.1029/2021JD034679.

Russell LM, D Lubin, I Silber, E Eloranta, J Muelmenstaedt, S Burrows, A Aiken, D Wang, M Petters, M Miller, A Ackerman, A Fridlind, M Witte, M Lebsock, D Painemal, R Chang, J Liggio, and M Wheeler. 2021. Eastern Pacific Cloud Aerosol Precipitation Experiment (EPCAPE) Science Plan. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-21-009. 10.2172/1804710.

Knopf D, K Barry, T Brubaker, L Jahl, K Jankowski, J Li, Y Lu, L Monroe, K Moore, F Rivera-Adorno, K Sauceda, Y Shi, J Tomlin, H Vepuri, P Wang, N Lata, E Levin, J Creamean, T Hill, S China, P Alpert, R Moffet, N Hiranuma, R Sullivan, A Fridlind, M West, N Riemer, A Laskin, P DeMott, and X Liu. 2021. "Aerosol–Ice Formation Closure: A Southern Great Plains Field Campaign." Bulletin of the American Meteorological Society, 102(10), 10.1175/BAMS-D-20-0151.1.
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