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The 1997 North American Interagency Intercomparison of Ultraviolet Spectroradiometers Including Narrowband Filter Radiometers
- Source :
- Journal of Research of the National Institute of Standards and Technology
- Publication Year :
- 2002
- Publisher :
- [Gaithersburg, MD] : U.S. Dept. of Commerce, National Institute of Standards and Technology, 2002.
-
Abstract
- The fourth North American Intercomparison of Ultraviolet Monitoring Spectroradiometers was held September 15 to 25, 1997 at Table Mountain outside of Boulder, Colorado, USA. Concern over stratospheric ozone depletion has prompted several government agencies in North America to establish networks of spectroradiometers for monitoring solar ultraviolet irradiance at the surface of the Earth. The main purpose of the Intercomparison was to assess the ability of spectroradiometers to accurately measure solar ultraviolet irradiance, and to compare the results between instruments of different monitoring networks. This Intercomparison was coordinated by NIST and NOAA, and included participants from the ASRC, EPA, NIST, NSF, SERC, USDA, and YES. The UV measuring instruments included scanning spectroradiometers, spectrographs, narrow band multi-filter radiometers, and broadband radiometers. Instruments were characterized for wavelength accuracy, bandwidth, stray-light rejection, and spectral irradiance responsivity. The spectral irradiance responsivity was determined two to three times outdoors to assess temporal stability. Synchronized spectral scans of the solar irradiance were performed over several days. Using the spectral irradiance responsivities determined with the NIST traceable standard lamp, and a simple convolution technique with a Gaussian slit-scattering function to account for the different bandwidths of the instruments, the measured solar irradiance from the spectroradiometers excluding the filter radiometers at 16.5 h UTC had a relative standard deviation of ±4 % for wavelengths greater than 305 nm. The relative standard deviation for the solar irradiance at 16.5 h UTC including the filter radiometer was ±4 % for filter functions above 300 nm.
- Subjects :
- solar ultraviolet
Radiometer
010504 meteorology & atmospheric sciences
Meteorology
General Engineering
Irradiance
Solar irradiance
01 natural sciences
Ozone depletion
spectroradiometers
Article
intercomparison
010309 optics
Responsivity
Spectroradiometer
13. Climate action
0103 physical sciences
Measuring instrument
Environmental science
NIST
0105 earth and related environmental sciences
Remote sensing
environmental monitoring
Subjects
Details
- Language :
- English
- ISSN :
- 21657254 and 1044677X
- Volume :
- 107
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Journal of Research of the National Institute of Standards and Technology
- Accession number :
- edsair.doi.dedup.....1c77f18771644b68e818311d787dbb8d