Atmospheric Radiation Measurement Climate Research Facility US Department of Energy

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 Locations

Facility Name Start Date
Central Facility, Barrow AK 1998-03-23


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. 2021. "The Shortwave Spectral Radiometer for Atmospheric Science: Capabilities and Applications from the ARM User Facility." Bulletin of the American Meteorological Society, 102(3), 10.1175/BAMS-D-19-0227.1.

Kassianov E, E Cromwell, J Monroe, L Riihimaki, C Flynn, J Barnard, J Michalsky, G Hodges, Y Shi, and J Comstock. 2021. "Harmonized and high-quality datasets of aerosol optical depth at a US continental site, 1997–2018." Scientific Data, 8(1), 82 (2021), 10.1038/s41597-021-00866-2.
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. 10.2172/1804477.

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. 10.2172/1600683.


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, .

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