uhsas: Ultra-High Sensitivity Aerosol Spectrometer

The Ultra-High-Sensitivity Aerosol Spectrometer (UHSAS) is an optical-scattering, laser-based aerosol particle spectrometer system for sizing particles in the 60 to 1000 nanometer (nm) range [1–3].

The instrument counts particles in up to 100 user-specified sizing bins. The instrument’s laser illuminates particles, which scatter light. The system captures the peak light signals that are generated. These signals are used for particle sizing, since the amount of light scattered correlates strongly with particle size.

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



  • Fixed
  • AMF1
  • AMF2
  • AMF3

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Painemal D, J Chiu, P Minnis, C Yost, X Zhou, M Cadeddu, E Eloranta, E Lewis, R Ferrare, and P Kollias. 2017. "Aerosol and cloud microphysics covariability in the northeast Pacific boundary layer estimated with ship-based and satellite remote sensing observations." Journal of Geophysical Research: Atmospheres, 122(4), 10.1002/2016JD025771.
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Uin J. 2016. Ultra-High-Sensitivity Aerosol Spectrometer Instrument Handbook. Ed. by Robert Stafford, DOE ARM Climate Research Facility. DOE/SC-ARM-TR-163.


Kassianov E, LK Berg, M Pekour, J Barnard, D Chand, C Flynn, M Ovchinnikov, A Sedlacek, B Schmid, J Shilling, J Tomlinson, and J Fast. 2015. "Airborne Aerosol in Situ Measurements during TCAP: A Closure Study of Total Scattering." Atmosphere, 6(8), 10.3390/atmos6081069.
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Tomlinson J, F Mei, J Comstock, J Hubbe, B Schmid, C Song, J Shilling, D Chand, and M Pekour. 2013. Characterization of the ARM Aerial Facility Optically Based Aerosol Instrumentation. Presented at 4th Atmospheric System Research (ASR) Science Team Meeting. Potomac, MD.

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