Uncertainty analysis of total ozone derived from direct solar irradiance spectra in the presence of unknown spectral deviations
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Published:2018-06-20
Issue:6
Volume:11
Page:3595-3610
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Vaskuri Anna,Kärhä Petri,Egli Luca,Gröbner Julian,Ikonen Erkki
Abstract
Abstract. We demonstrate the use of a Monte Carlo model to estimate the uncertainties in total ozone column (TOC) derived from ground-based direct solar spectral
irradiance measurements. The model estimates the effects of possible
systematic spectral deviations in the solar irradiance spectra on the
uncertainties in retrieved TOC. The model is tested with spectral data
measured with three different spectroradiometers at an intercomparison
campaign of the research project “Traceability for atmospheric total column
ozone” at Izaña, Tenerife on 17 September 2016. The TOC values derived at
local noon have expanded uncertainties of 1.3 % (3.6 DU) for a high-end
scanning spectroradiometer, 1.5 % (4.4 DU) for a high-end array
spectroradiometer, and 4.7 % (13.3 DU) for a roughly adopted instrument based on commercially available components and an array spectroradiometer
when correlations are taken into account. When neglecting the effects of
systematic spectral deviations, the uncertainties reduce by a factor of 3.
The TOC results of all devices have good agreement with each other, within
the uncertainties, and with the reference values of the order of 282 DU
during the analysed day, measured with Brewer spectrophotometer #183.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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