csphot > Cimel SunphotometerInstrument Type(s) > Baseline • External • Guest

The Cimel sunphotometer (CSPHOT) is a multi-channel, automatic sun-and-sky scanning radiometer that measures the direct solar irradiance and sky radiance at the Earth’s surface. It takes measurements at predetermined discrete wavelengths in the visible and near-infrared parts of the spectrum to determine atmospheric transmission and scattering properties. The CSPHOT only operates during daylight (sun above horizon).


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Active Instrument Locations

Facility Name Instrument Start Date
Graciosa Island, Azores, Portugal 2013-09-28
Central Facility, Lamont, OK 1994-04-06
Houston, TX; AMF1 (main site for TRACER) 2021-04-14
Oliktok Point, Alaska; AMF3 2013-10-03
Central Facility, Barrow AK 1997-07-30


Haywood J, S Abel, P Barrett, N Bellouin, A Blyth, K Bower, M Brooks, K Carslaw, H Che, H Coe, M Cotterell, I Crawford, Z Cui, N Davies, B Dingley, P Field, P Formenti, H Gordon, M de Graaf, R Herbert, B Johnson, A Jones, J Langridge, F Malavelle, D Partridge, F Peers, J Redemann, P Stier, K Szpek, J Taylor, D Watson-Parris, R Wood, H Wu, and P Zuidema. 2021. "The CLoud–Aerosol–Radiation Interaction and Forcing: Year 2017 (CLARIFY-2017) measurement campaign." Atmospheric Chemistry and Physics, 21(2), 10.5194/acp-21-1049-2021.


Balmes K and Q FU. 2020. "The diurnally-averaged aerosol direct radiative effect and the use of the daytime-mean and insolation-weighted-mean solar zenith angles." Journal of Quantitative Spectroscopy and Radiative Transfer, 257, 107363, 10.1016/j.jqsrt.2020.107363.

Silva S, D Ridley, and C Heald. 2020. "Exploring the Constraints on Simulated Aerosol Sources and Transport across the North Atlantic with Island‐Based Sun Photometers." Earth and Space Science, 7(11), e2020EA001392, 10.1029/2020EA001392.

Vountas M, K Belinska, V Rozanov, L Lelli, L Mei, S Jafariserajehlou, and J Burrows. 2020. "Retrieval of aerosol optical thickness and surface parameters based on multi-spectral and multi-viewing space-borne measurements." Journal of Quantitative Spectroscopy and Radiative Transfer, 256, 10.1016/j.jqsrt.2020.107311.

Riihimaki L, C Flynn, A McComiskey, D Lubin, Y Blanchard, J Chiu, G Feingold, D Feldman, J Gristey, C Herrera, G Hodges, E Kassianov, S LeBlanc, A Marshak, J Michalsky, P Pilewskie, S Schmidt, R Scott, Y Shea, K Thome, R Wagener, and B Wielicki. 2020. "The Shortwave Spectral Radiometer for Atmospheric Science: Capabilities and Applications from the ARM User Facility." Bulletin of the American Meteorological Society, , 10.1175/BAMS-D-19-0227.1. ONLINE.

Abbasi B, Z Qin, W Du, J Fan, C Zhao, Q Hang, S Zhao, and S Li. 2020. "An Algorithm to Retrieve Total Precipitable Water Vapor in the Atmosphere from FengYun 3D Medium Resolution Spectral Imager 2 (FY-3D MERSI-2) Data." Remote Sensing, 12(21), 10.3390/rs12213469.

Marquardt Collow A, M Miller, L Trabachino, M Jensen, and M Wang. 2020. "Radiative heating rate profiles over the southeast Atlantic Ocean during the 2016 and 2017 biomass burning seasons." Atmospheric Chemistry and Physics, 20(16), 10.5194/acp-20-10073-2020.
Research Highlight

Kassianov E, E Cromwell, Y Shi, J Monroe, L Riihimaki, and C Flynn. 2020. Quality Control Aerosol Optical Depth Value-Added Product Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-TR-247.

Marchand R. 2020. Macquarie Island Cloud and Radiation Experiment (MICRE) Field Campaign Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-20-005.

Bellouin N, J Quaas, E Gryspeerdt, S Kinne, P Stier, D Watson‐Parris, O Boucher, K Carslaw, M Christensen, A Daniau, J Dufresne, G Feingold, S Fiedler, P Forster, A Gettelman, J Haywood, U Lohmann, F Malavelle, T Mauritsen, D McCoy, G Myhre, J Mülmenstädt, D Neubauer, A Possner, M Rugenstein, Y Sato, M Schulz, S Schwartz, O Sourdeval, T Storelvmo, V Toll, D Winker, and B Stevens. 2020. "Bounding Global Aerosol Radiative Forcing of Climate Change." Reviews of Geophysics, 58(1), 10.1029/2019RG000660.

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