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Applied Optics

Applied Optics


  • Vol. 41, Iss. 9 — Mar. 20, 2002
  • pp: 1805–1814

Methodology for determining aerosol optical depth from brewer 300–320-nm ozone measurements

Franco Marenco, Alcide di Sarra, and John De Luisi  »View Author Affiliations

Applied Optics, Vol. 41, Issue 9, pp. 1805-1814 (2002)

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With a Brewer spectrophotometer, an estimation of total ozone is made from relative measurements of direct-sun ultraviolet radiation at six wavelengths from 300 to 320 nm. During normal operations, one of six neutral-density filters is selected automatically to maintain the detector in its linear response range. On the basis of these standard direct-sun observations, estimates of aerosol optical depth can be derived, provided that a calibration of the relative measurements is available for each neutral-density filter. To obtain the calibration, we implemented a routine to measure direct-sun signals with a fixed neutral-density filter and applied the Langley method to the measured photon counts. Results show that if a sufficiently large number of cloud-free mornings or afternoons is available, a reliable calibration can be achieved even at sea-level sites that are characterized by large aerosol variability. The derived aerosol optical depths appear consistent with those measured independently by a multifilter rotating shadow-band radiometer. Existing relatively long-term series of direct-sun ozone measurements by Brewer instruments may be used for retrieval of aerosol optical depth.

© 2002 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(280.0280) Remote sensing and sensors : Remote sensing and sensors

Original Manuscript: May 3, 2001
Revised Manuscript: September 27, 2001
Published: March 20, 2002

Franco Marenco, Alcide di Sarra, and John De Luisi, "Methodology for determining aerosol optical depth from brewer 300–320-nm ozone measurements," Appl. Opt. 41, 1805-1814 (2002)

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