cpc > Condensation Particle CounterInstrument Type(s) > Baseline • Evaluation • External • Guest

The condensation particle counter (CPC) measures sub-micron aerosol particle number concentration by condensing fluid onto particles and causing them to grow to sizes that are easily detectable by optical scattering. The condensing liquid is typically an alcohol (e.g., butanol) or water.

Depending on the CPC type, typical CPC instruments can count particles with sizes that range from 3 to 3000 nanometers (ultrafine CPC) or from 10 to 3000 nanometers (fine CPC). The CPC is part of the aerosol observing system (AOS).


ENA-AM was developed to identify high number concentration events using one-minute time resolution data to mask periods that are not regionally representative.


Primary Derived Measurements


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Data Details

Developed By Allison Aiken | Francesca Gallo
Contact Francesca Gallo
Resource(s) Data Directory
Data format text
Site ENA
Content time range 14 October 2010 - 15 June 2023
Attribute accuracy ENA-AM was validated based on the agreement between C1 and S1 masked CPC datasets.
Positional accuracy No formal positional accuracy tests were conducted
Data Consistency and Completeness CPC data is consistent with level b1 data in the archive at the time of this PI product. ENA-AM was developed as a QA/QC PI data product for the aerosol measurements. Data set is considered complete for the information presented, as described in the abstract.Users are advised to read the rest of the metadata record carefully for additional details.
Access Restriction No access constraints are associated with this data.
Use Restriction No use constraints are associated with this data.
File naming convention NameMask_site_season
Directory Organization ENA-AM, site, season
Citations Aiken AC, F Gallo, J Uin, SR Springston, J Wang, G Zheng, C Kuang, A McComiskey, R Wood, C Flynn, A Theisen, E Azevedo, P Ortega, and H Powers. 2019. Eastern North Atlantic (ENA) Aerosol Supplementary Site (S1) Data Analysis Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-229.

F Gallo, J Uin, SR Springston, J Wang, G Zheng, C Kuang, E Azevedo, R Wood, A McComiskey, F Mei, J Kyrouac, Aiken AC. Identifying a regional aerosol baseline in the Eastern North Atlantic using collocated measurements and a mathematical algorithm to mask high submicron number concentration aerosol events. Submitted to Aerosol Chemistry and Physics, ACE-ENA Special Issue


Veals P, A Varble, J Russell, J Hardin, and E Zipser. 2022. "Indications of a Decrease in the Depth of Deep Convective Cores with Increasing Aerosol Concentration during the CACTI Campaign." Journal of the Atmospheric Sciences, 79(3), 10.1175/JAS-D-21-0119.1. ONLINE.
Research Highlight

Shupe M, M Rex, B Blomquist, P Persson, J Schmale, T Uttal, D Althausen, H Angot, S Archer, L Bariteau, I Beck, J Bilberry, S Bucci, C Buck, M Boyer, Z Brasseur, I Brooks, R Calmer, J Cassano, V Castro, D Chu, D Costa, C Cox, J Creamean, S Crewell, S Dahlke, E Damm, G de Boer, H Deckelmann, K Dethloff, M Dütsch, K Ebell, A Ehrlich, J Ellis, R Engelmann, A Fong, M Frey, M Gallagher, L Ganzeveld, R Gradinger, J Graeser, V Greenamyer, H Griesche, S Griffiths, J Hamilton, G Heinemann, D Helmig, A Herber, C Heuzé, J Hofer, T Houchens, D Howard, J Inoue, H Jacobi, R Jaiser, T Jokinen, O Jourdan, G Jozef, W King, A Kirchgaessner, M Klingebiel, M Krassovski, T Krumpen, A Lampert, W Landing, T Laurila, D Lawrence, M Lonardi, B Loose, C Lüpkes, M Maahn, A Macke, W Maslowski, C Marsay, M Maturilli, M Mech, S Morris, M Moser, M Nicolaus, P Ortega, J Osborn, F Pätzold, D Perovich, T Petäjä, C Pilz, R Pirazzini, K Posman, H Powers, K Pratt, A Preußer, L Quéléver, M Radenz, B Rabe, A Rinke, T Sachs, A Schulz, H Siebert, T Silva, A Solomon, A Sommerfeld, G Spreen, M Stephens, A Stohl, G Svensson, J Uin, J Viegas, C Voigt, P von der Gathen, B Wehner, J Welker, M Wendisch, M Werner, Z Xie, and F Yue. 2022. "Overview of the MOSAiC expedition—Atmosphere." Elementa: Science of the Anthropocene, 10(1), 10.1525/elementa.2021.00060.
Research Highlight

Zaveri R, J Wang, J Fan, Y Zhang, J Shilling, A Zelenyuk, F Mei, R Newsom, M Pekour, J Tomlinson, J Comstock, M Shrivastava, E Fortner, L Machado, P Artaxo, and S Martin. 2022. "Rapid growth of anthropogenic organic nanoparticles greatly alters cloud life cycle in the Amazon rainforest." Science Advances, 8(2), 10.1126/sciadv.abj0329.
Research Highlight


Andrews E. 2021. Comparison of X1 (OLD) and X3 (NEW) Aerosol Observing Systems at the North Slope of Alaska NOAA Observatory. Ed. by Robert Stafford, ARM user facility. DOE-SC-ARM-TR-276. 10.2172/1838010.

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.

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