nimfr > Normal Incidence Multifilter RadiometerInstrument Type(s) > Baseline

The normal incidence multifilter radiometer (NIMFR) is a ground-based instrument that provides a time series of the shortwave spectral direct normal irradiance. Additionally, a broadband silicon detector can crudely measure the direct normal broadband irradiance.

These irradiance measurements can be used to infer clear-sky aerosol optical depth and columnar abundances of ozone and water vapor. The NIMFR is one of a class of instruments known as sun photometers.


  • Fixed
  • AMF1
  • AMF2
  • AMF3

Active Instrument Locations

Facility Name Instrument Start Date
Central Facility, Lamont, OK 2000-04-03


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.

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.

Riihimaki L, C Flynn, and A McComiskey. 2020. ARM Shortwave Spectral Radiometry Strategy Review Report. Ed. by Robert Stafford, ARM user facility. DOE/SC-ARM-20-003.


Kassianov E, J Monroe, L Riihimaki, C Flynn, E Cromwell, G Hodges, and A McComiskey. 2018. Climatology of aerosol optical depth at mid-continental US site: ground-based observations. In SPIE Remote Sensing, 2018, Berlin, Germany, .


Kassianov E, C Flynn, A Koontz, C Sivaraman, and J Barnard. 2013. "Failure and redemption of MFRSR/NIMFR cloud screening: Contrasting algorithm performance at ARM NSA and SGP sites." Atmosphere, 4(3), 10.3390/atmos4030299.

Koontz A, G Hodges, J Barnard, C Flynn, and J Michalsky. 2013. Aerosol Optical Depth Value-Added Product Report. U.S. Department of Energy. DOE/SC-ARM/TR-129.


Flynn C, DD Turner, A Koontz, D Chand, and C Sivaraman. 2012. Aerosol Best Estimate (AEROSOLBE) Value-Added Product. DOE ARM Climate Research Facility. DOE/SC-ARM/TR-115.


Berkowitz CM, LL Berg, RA Zaveri, DJ Cziczo, A Zelenyuk, CJ Flynn, RA Ferrare, EI Kassianov, CA Hostetler, JD Fast, B Cairns, PJ Rasch, PB Russell, JE Shilling, and B Ervens. 2011. The Two Column Aerosol Project (TCAP) Science Plan. DOE ARM Climate Research Facility. DOE/SC-ARM-11-017.

Hodges GB and JJ Michalsky. 2011. Multifilter Rotating Shadowband Radiometer (MFRSR) Handbook; with Subsections for the Following Derivative Instruments: Multifilter Radiometer (MFR); Normal Incidence Multifilter Radiometer (NIMFR). U.S. DOE, Office of Science, Office of Biological and Environmental Research. DOE/SC-ARM/TR-059.


Michalsky J, F Denn, C Flynn, G Hodges, P Kiedron, A Koontz, J Schlemmer, and SE Schwartz. 2010. "Climatology of aerosol optical depth in north-central Oklahoma: 1992–2008." Journal of Geophysical Research – Atmospheres, 115(D7), D07203, 10.1029/2009jd012197.
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