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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 17 — Jun. 10, 2014
  • pp: 3598–3606

Comparisons of three NILU-UV instruments deployed at the same site in the New York area

L. Fan, W. Li, A. Dahlback, J. J. Stamnes, S. Englehardt, S. Stamnes, and K. Stamnes  »View Author Affiliations

Applied Optics, Vol. 53, Issue 17, pp. 3598-3606 (2014)

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The Norwegian Institute for Air Research ultraviolet (NILU-UV) irradiance meter is a ground-based, multichannel, moderate bandwidth filter instrument that measures irradiances at ultraviolet (UV) and visible wavelengths with five channels in the UV (302, 312, 320, 340, and 380 nm) and one channel in the visible (400–700 nm) part of the spectrum. Minute-by-minute irradiances recorded in these channels are used to infer the total ozone column (TOC) amount, and a radiation modification factor (RMF) designed to have a value close to 100 under cloud-free conditions. The performance of three NILU-UV instruments deployed side-by-side in the New York area (40.74°N, 74.03°E) is assessed, and derived TOC values are compared with those derived from the ozone monitoring instrument (OMI) deployed on NASA’s AURA satellite. Based on about three years of data, it was found that the three instruments yielded similar TOC values that were in close agreement with those derived from the OMI. The relative difference in TOC values derived from the three NILU-UV instruments was generally less than 2.5%. Cloud cover affects the accuracy of the inferred TOC, but reliable values can be obtained in the presence of clouds, although the accuracy deteriorates under heavy overcast conditions with RMF values smaller than 65 (low cloud transmittance).

© 2014 Optical Society of America

OCIS Codes
(010.4950) Atmospheric and oceanic optics : Ozone
(010.1615) Atmospheric and oceanic optics : Clouds

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: March 19, 2014
Manuscript Accepted: April 28, 2014
Published: June 2, 2014

L. Fan, W. Li, A. Dahlback, J. J. Stamnes, S. Englehardt, S. Stamnes, and K. Stamnes, "Comparisons of three NILU-UV instruments deployed at the same site in the New York area," Appl. Opt. 53, 3598-3606 (2014)

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