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- Title
Optical Characterization of Three Reference Dobsons in the ATMOZ Project - Verification of G. M. B. Dobson's Original Specifications.
- Authors
Köhler, Ulf; Nevas, Saulius; McConville, Glen; Evans, Robert; Smid, Marek; Stanek, Martin; Redondas, Alberto; Schönenborn, Fritz
- Abstract
Three reference Dobsons (regional standards Dobsons No. 064 Hohenpeissenberg - Germany and No. 074 Hradec Kralove - Czech Republic and primary = world standard Dobson No. 083 Boulder - USA) were optically characterized at PTB (Physikalisch-Technische Bundesanstalt in Braunschweig) in 2015 and at CMI (Czech Metrology Institute in Prague) in 2016 within the EMRP ENV 059 project Traceability for the total column ozone. Bandpass functions and the related parameters of the instruments were measured and compared with G. M. B. Dobson's specification in his handbook. A predominantly good match of the bandpass functions and the peak (centroid) wavelengths of D083, D064 and D074 with the nominal values could be observed. Slightly larger deviations from the nominal Dobson data can be seen in the longer wavelengths, especially in the D-wavelength. As consequence of these findings the differences of the derived Effective Absorptions Coefficients (EACs) for ozone to Dobson's nominal ones are not too large in both old Bass-Paur (BP) and new IUP-ozone absorption cross sections. Their consideration in the calculation of the total ozone column (TOC) leads to improvements of significantly less than ±1 % in the AD- and between -1 % and -2 % in the CD-wavelengths pairs. Besides this positive effect of the achievement of data with higher quality needed for trend analyses and satellite validation, it will be possible to explain uncommon behaviours of field Dobsons during calibration services.
- Subjects
OZONE; WAVELENGTHS
- Publication
Atmospheric Measurement Techniques Discussions, 2017, p1
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amt-2017-411