sp2: Single Particle Soot Photometer

The single-particle soot photometer (SP2) measures the soot (black carbon) mass of individual aerosol particles by laser-induced incandescence down to concentrations as low as ng/m^3.

The SP2 is part of the aerosol observing system (AOS).



  • Fixed
  • AMF1
  • AMF2
  • AMF3


Abel S, P Barrett, P Zuidema, J Zhang, M Christensen, F Peers, J Taylor, I Crawford, K Bower, and M Flynn. 2020. "Open cells exhibit weaker entrainment of free-tropospheric biomass burning aerosol into the south-east Atlantic boundary layer." Atmospheric Chemistry and Physics, 20(7), 10.5194/acp-20-4059-2020.

Langenbrunner B. 2020. "Ill-sooted models." Nature Climate Change, 10(4), 10.1038/s41558-020-0749-5.

Fierce L, T Onasch, C Cappa, C Mazzoleni, S China, J Bhandari, P Davidovits, D Fischer, T Helgestad, A Lambe, A Sedlacek, G Smith, and L Wolff. 2020. "Radiative absorption enhancements by black carbon controlled by particle-to-particle heterogeneity in composition." Proceedings of the National Academy of Sciences, 117(10), 10.1073/pnas.1919723117.
Research Highlight

Pennypacker S, M Diamond, and R Wood. 2020. "Ultra-clean and smoky marine boundary layers frequently occur in the same season over the southeast Atlantic." Atmospheric Chemistry and Physics, 20(4), 10.5194/acp-20-2341-2020.

Laing J, D Jaffe, and A Sedlacek, III. 2020. "Comparison of Filter-based Absorption Measurements of Biomass Burning Aerosol and Background Aerosol at the Mt. Bachelor Observatory." Aerosol and Air Quality Research, 20(4), 10.4209/aaqr.2019.06.0298.


Varble A, S Nesbitt, P Salio, E Avila, P Borque, P DeMott, G McFarquhar, S van den Heever, E Zipser, D Gochis, R Houze, M Jensen, P Kollias, S Kreidenweis, R Leung, K Rasmussen, D Romps, and C Williams. 2019. Cloud, Aerosol, and Complex Terrain Interactions (CACTI) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-19-028.

Zhang J and P Zuidema. 2019. "The diurnal cycle of the smoky marine boundary layer observed during August in the remote southeast Atlantic." Atmospheric Chemistry and Physics, 19(23), 10.5194/acp-19-14493-2019.
Research Highlight

Shou C, N Riemer, T Onasch, A Sedlacek, A Lambe, E Lewis, P Davidovits, and M West. 2019. "Mixing state evolution of agglomerating particles in an aerosol chamber: Comparison of measurements and particle-resolved simulations." Aerosol Science and Technology, 53(11), 10.1080/02786826.2019.1661959.

de Sá S, L Rizzo, B Palm, P Campuzano-Jost, D Day, L Yee, R Wernis, G Isaacman-VanWertz, J Brito, S Carbone, Y Liu, A Sedlacek, S Springston, A Goldstein, H Barbosa, M Alexander, P Artaxo, J Jimenez, and S Martin. 2019. "Contributions of biomass-burning, urban, and biogenic emissions to the concentrations and light-absorbing properties of particulate matter in central Amazonia during the dry season." Atmospheric Chemistry and Physics, 19(12), 10.5194/acp-19-7973-2019.

Wang J, R Wood, M Jensen, E Azevedo, C Bretherton, D Chand, C Chiu, X Dong, J Fast, A Gettelman, S Ghan, S Giangrande, M Gilles, A Jefferson, P Kollias, C Kuang, A Laskin, E Lewis, X Liu, Y Liu, E Luke, A McComiskey, F Mei, M Miller, A Sedlacek, and R Shaw. 2019. Aerosol and Cloud Experiments in Eastern North Atlantic (ACE-ENA) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-19-012.

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