Instrument : Multifilter Rotating Shadowband Radiometer (MFRSR)

Instrument Categories
Aerosols, Radiometric

Picture of the Multi-Filter Rotating Shadowband Radiometer (MFRSR)

General Overview

The multifilter rotating shadowband radiometer (MFRSR) takes spectral measurements of direct normal, diffuse horizontal and total horizontal solar irradiances. These measurements are at nominal wavelengths of 415, 500, 615, 673, 870, and 940 nm. The measurements are made at a user-specified time interval, usually about one minute or less. The sampling rate for the Atmospheric Radiation Measurement (ARM) Climate Research Facility MFRSRs is 20 seconds. From such measurements, one may infer the atmosphere's optical depth at the wavelengths mentioned above. In turn, these optical depths may be used to derive information about the column abundances of ozone and water vapor (Michalsky et al. 1995), as well as aerosol (Michalsky et al. 1994) and other atmospheric constituents.

A silicon detector is also part of the MFRSR. This detector provides a measure of the broadband direct normal, diffuse horizontal and total horizontal solar irradiances. A MFRSR head that is mounted to look vertically downward can measure upwelling spectral irradiances. In the ARM system, this instrument is called a "multifilter radiometer (MFR)". At the Southern Great Plains (SGP) there are two MFRs; one mounted at the 10-m height and the other at 25 m. At the North Slope of Alaska (NSA) sites, the MFRs are mounted at 10 m. MFRSR heads are also used to measure "normal incidence" radiation by mounting on a solar tracking device. These are referred to as normal incidence multi-filter radiometers (NIMFRs) and are located at the SGP and NSA sites. Another specialized use for the MFRSR is the narrow field of view (NFOV) instrument located at SGP. The NFOV is a ground-based radiometer (MFRSR head) that looks straight up.

Output Value-Added Products

This instrument is an input to the following value-added products, which provide improved measurements or derived quantities.

  • mfrsraod1mich : MFRSR: derived total & aerosol optical depth from 1st Michalsky algorithm
  • mfrsrcldod1min : Derived: Cloud Optical Properties from MFRSR, MWR, Langley Analysis
  • nimfraod1mich : NIMFR: derived total & aerosol optical depth from 1st Michalsky algorithm
  • qcrad1long : Surface Radiation Measurement Quality Control testing, including climatologically configurable limits
  • qcradbeflux1long : Surface Radiation Measurement (BEFLUX input) QC testing, incl. climatologically configurable limits
  • qcradbrs1long : Surface Radiation Measurement (BRS input) QC testing, incl. climatologically configurable limits
  • sasheniraod : Shortwave Array Spectroradiometer-Hemispheric, NIR Aerosol Optical Depths
  • sashevisaod : Shortwave Array Spectroradiometer-Hemispheric, VIS Aerosol Optical Depths

Output Datastreams

  • mfrsr : Multi-Filter Rotating Shadowband Radiometer (MFRSR): irradiances

Primary Measurements

The following measurements are those considered scientifically relevant.


Eastern North Atlantic
ENAC1 Browse DataGraciosa Island, Azores, Portugal
North Slope Alaska
NSAC1 Browse Data Browse PlotsCentral Facility, Barrow AK
Southern Great Plains
SGPE1 Browse DataLarned, KS (Extended) retired
SGPE3 Browse DataLeRoy, KS (Extended)
SGPE7 Browse DataElk Falls, KS (Extended)
SGPE8 Browse DataColdwater, KS (Extended) retired
SGPE9 Browse DataAshton, KS (Extended)
SGPE10 Browse DataTyro, KS (Extended) retired
SGPE11 Browse Data Browse PlotsByron, OK (Extended)
SGPE12 Browse DataPawhuska, OK (Extended)
SGPE13 Browse DataLamont, OK (Extended)
SGPE15 Browse DataRingwood, OK (Extended)
SGPE16 Browse DataVici, OK (Extended) retired
SGPE22 Browse DataCordell, OK (Extended)
SGPE24 Browse DataCyril, OK (Extended) retired
SGPE25 Browse DataSeminole, OK (Extended) retired
SGPE27 Browse DataEarlsboro, OK (Extended) retired
SGPE31 Browse DataAnthony, KS (Extended)
SGPE32 Browse DataMedford, OK (Extended)
SGPE33 Browse Data Browse PlotsNewkirk, OK (Extended)
SGPE34 Browse Data Browse PlotsMaple City, KS (Extended)
SGPE35 Browse DataTryon, OK (Extended)
SGPE36 Browse Data Browse PlotsMarshall, OK (Extended)
SGPE37 Browse Data Browse PlotsWaukomis, OK (Extended)
SGPE38 Browse DataOmega, OK (Extended)
Tropical Western Pacific
TWPC1 Browse DataCentral Facility, Manus I., PNG retired
ARM Mobile Facility
FKBM1 Browse DataBlack Forest, Germany retired
GANM1 Browse Data Browse PlotsGan Airport, Gan Island, Maldives retired
GRWM1 Browse Data Browse PlotsGraciosa Island, Azores, Portugal retired
HFEM1 Browse DataShouxian, Anhui, China retired
MAOM1 Browse Data Browse PlotsManacapuru, Amazonas, Brazil; AMF1
NIMM1 Browse Data Browse PlotsNiamey, Niger retired
OLIM1 Browse DataOliktok Point, Alaska
PGHM1 Browse DataARIES Observatory, Nainital, Uttarkhand, India retired
PVCM1 Browse DataHighland Center, Cape Cod MA; AMF 1 retired
PYEM1 Browse DataPoint Reyes, CA retired
SBSM1 Browse DataSteamboat Springs CO, Valley Site retired
TMPM1 Browse DataU. of Helsinki Research Station (SMEAR II), Hyytiala, Finland; AMF2
 retired = Originating instrument has been retired at this location


Gary Hodges
(303) 497-6460