nephelometer > NephelometerVAP Type(s) > Baseline • External • Guest

The nephelometer measures the total scattering and hemispheric backscattering of aerosol. Nephelometers are deployed in pairs, with one measuring the ambient conditions and the other measuring the scattering as a function of slowly increasing or decreasing relative humidity (RH). The combination can then be used to derive the hygroscopic growth factor as a function of RH: f(RH).

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


  • Fixed
  • AMF1
  • AMF2
  • AMF3


Titos G, M Burgos, P Zieger, L Alados-Arboledas, U Baltensperger, A Jefferson, J Sherman, E Weingartner, B Henzing, K Luoma, C O'Dowd, A Wiedensohler, and E Andrews. 2021. "A global study of hygroscopicity-driven light-scattering enhancement in the context of other in situ aerosol optical properties." Atmospheric Chemistry and Physics, 21(17), 10.5194/acp-21-13031-2021.

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.

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Nascimento J, M Bela, B Meller, A Banducci, L Rizzo, A Vara-Vela, H Barbosa, H Gomes, S Rafee, M Franco, S Carbone, G Cirino, R Souza, S McKeen, and P Artaxo. 2021. "Aerosols from anthropogenic and biogenic sources and their interactions – modeling aerosol formation, optical properties, and impacts over the central Amazon basin." Atmospheric Chemistry and Physics, 21(9), 10.5194/acp-21-6755-2021.

Feldman D, A Aiken, W Boos, R Carroll, V Chandrasekar, W Collins, S Collis, J Deems, P DeMott, J Fan, A Flores, D Gochis, J Harrington, M Kumjian, LR Leung, T O'Brien, M Raleigh, A Rhoades, SM Skiles, J Smith, R Sullivan, P Ullrich, A Varble, and K Williams. 2021. Surface Atmosphere Integrated Field Laboratory (SAIL) Science Plan. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-21-004.

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