nfov: Narrow Field of View Zenith Radiometer

The Narrow-Field-of-View Zenith Radiometer (NFOV) is a ground-based radiometer that looks straight up. As implied by the name, the field of view of the instrument is narrow, thus permitting the measurement of the downwelling zenith radiance.

The instrument outputs a time series of 1-sec observations of the zenith spectral radiance measured at a wavelength of 869 nm. Data from the instrument have many uses; for example, the internal structure of clouds can be characterized by examining a time series of the radiance data.



  • Fixed
  • AMF1
  • AMF2
  • AMF3

Related Publications


Fielding MD, J Chiu, RJ Hogan, and G Feingold. 2014. "A novel ensemble method for retrieving properties of warm cloud in 3-D using ground-based scanning radar and zenith radiances." Journal of Geophysical Research: Atmospheres, 119(18), 10.1002/2014jd021742.

Mann JA, JC Chiu, RJ Hogan, EJ O'Connor, TS L'Ecuyer, TH Stein, and A Jefferson. 2014. "Aerosol impacts on drizzle properties in warm clouds from ARM Mobile Facility maritime and continental deployments." Journal of Geophysical Research: Atmospheres, 119(7), 10.1002/2013jd021339.


Remillard J, P Kollias, and W Szyrmer. 2013. "Radar-radiometer retrievals of cloud number concentration and dispersion parameter in nondrizzling marine stratocumulus." Atmospheric Measurement Techniques, 6(7), 10.5194/amt-6-1817-2013.


McComiskey A and G Feingold. 2012. "The scale problem in quantifying aerosol indirect effects." Atmospheric Chemistry and Physics, 12(2), 10.5194/acp-12-1031-2012.


Marshak A, Y Knyazikhin, J Chiu, and W Wiscombe. 2010. Cloud Edges: the Spectral-invariant Relationship Between Ratios of Zenith Radiances Near Them. Presented at Atmospheric System Research (ASR) Science Team Meeting.


Voyles JW. 2007. ACRF Instrumentation Status: New, Current, and Future September – October 2007. DOe ARM Climate Research Facility. DOE/SC-ARM/P-07-002.8.


Wiscombe W, A Marshak, JC Chiu, Y Knyazikhin, J Barnard, and Y Luo. 2005. A Novel Retrieval Algorithm for Cloud Optical Properties from the Atmospheric Radiation Measurement Two-Channel Narrow-Field-of-View Radiometer. Presented at the Fifteenth Atmospheric Radiation Measurement Science Team Meeting. Daytona Beach, Florida.

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