scholarly journals Recommendation of a consensus value of the ozone absorption cross-section at 253.65 nm based on a literature review

Metrologia ◽  
2019 ◽  
Vol 56 (3) ◽  
pp. 034001 ◽  
Author(s):  
J T Hodges ◽  
J Viallon ◽  
P J Brewer ◽  
B J Drouin ◽  
V Gorshelev ◽  
...  
Keyword(s):  
Literature Review ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Consensus Value

scholarly journals A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength

2018 ◽  
Vol 11 (3) ◽  
pp. 1707-1723 ◽  
Author(s):  
Christof Janssen ◽  
Hadj Elandaloussi ◽  
Julian Gröbner
Keyword(s):  
Remote Sensing ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Remote Sensing Data ◽  
Standard Uncertainty ◽  
Careful Consideration ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Relative Temperature ◽  
Relative Level

Abstract. The room temperature (294.09 K) absorption cross section of ozone at the 325 nm HeCd wavelength has been determined under careful consideration of possible biases. At the vacuum wavelength of 325.126 nm, thus in a region used by a variety of ozone remote sensing techniques, an absorption cross-section value of σ = 16.470×10−21 cm2 was measured. The measurement provides the currently most accurate direct photometric absorption value of ozone in the UV with an expanded (coverage factor k = 2) standard uncertainty u(σ) = 31×10−24 cm2, corresponding to a relative level of 2 ‰. The measurements are most compatible with a relative temperature coefficient cT = σ−1 ∂ Tσ = 0.0031 K−1 at 294 K. The cross section and its uncertainty value were obtained using generalised linear regression with correlated uncertainties. It will serve as a reference for ozone absorption spectra required for the long-term remote sensing of atmospheric ozone in the Huggins bands. The comparison with commonly used absorption cross-section data sets for remote sensing reveals a possible bias of about 2 %. This could partly explain a 4 % discrepancy between UV and IR remote sensing data and indicates that further studies will be required to reach the accuracy goal of 1 % in atmospheric reference spectra.

scholarly journals Updated ozone absorption cross section will reduce air quality compliance

2015 ◽  
Vol 15 (14) ◽  
pp. 19537-19551 ◽  
Author(s):  
E. D. Sofen ◽  
M. J. Evans ◽  
A. C. Lewis
Keyword(s):  
Air Quality ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Quality Standards ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Air Quality Standards ◽  
Target Values ◽  
Quality Health ◽  
Small Change

Abstract. Photometric ozone measurements rely upon an accurate value of the ozone absorption cross section at 253.65 nm. This has recently been reevaluated by Viallon et al. (2015) as 1.8 % smaller than the accepted value (Hearn, 1961) used for the preceding fifty years. Thus, ozone measurements that applied the older cross section systematically underestimate the amount of ozone in air. We correct the reported historical surface data from North America and Europe and find that this modest change in cross section has a significant impact on the number of locations that are out of compliance with air quality regulations if the air quality standards remain the same. We find 18, 23, and 20 % increases in the number of sites that are out of compliance with current US, Canadian, and European ozone air quality health standards for the year 2012. Should the new cross section value be applied, it would impact attainment of air quality standards and compliance with relevant clean air acts, unless the air quality target values themselves were also changed proportionately. We draw attention to how a small change in gas metrology has a global impact on attainment and compliance with legal air quality standards. We suggest that further laboratory work to evaluate the new cross section is needed and suggest three possible technical and policy responses should the new cross section be adopted.

scholarly journals Varying Effects of Temperature and Path-length on Ozone Absorption Cross-Section

2018 ◽  
Vol 16 (2) ◽  
pp. 618
Author(s):  
Enenche Patrick ◽  
Michael David ◽  
A.O. Caroline ◽  
Mohd Haniff Ibrahim ◽  
Sevia Mahdaliza Idrus ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Path Length ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Effects Of Temperature

scholarly journals Revised temperature dependent ozone absorption cross section spectra (Bogumil et al.) measured with the sciamachy satellite spectrometer

2013 ◽  
Vol 6 (2) ◽  
pp. 2449-2481 ◽  
Author(s):  
W. Chehade ◽  
V. Gorshelev ◽  
A. Serdyuchenko ◽  
J. P. Burrows ◽  
M. Weber
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
Total Ozone ◽  
Published Data ◽  
Absorption Cross ◽  
Atmospheric Conditions ◽  
Cross Section Data ◽  
Ozone Absorption ◽  
Section Data

Abstract. Ozone absorption cross section spectra and other trace gases had been measured using the Scanning Imaging Absorption spectroMeter for Atmospheric ChartograpHY (SCIAMACHY) satellite instrument at relevant atmospheric conditions. The measured cross sections were relative cross sections and were converted to absolute values using published data. Using the SCIAMACHY's FM cross sections as published by Bogumil et al. (2003) in the SCIAMACHY retrievals of total ozone leads to an overestimation in the total ozone by 5% compared to collocated GOME data. This work presents the procedures followed to correct the ozone cross section data as published in Bogumil et al. (2003) starting from original raw data (optical density spectra) from the original measurements. The revised data agrees well within 3% with other published ozone cross-sections and preserves the correct temperature dependence in the Hartley, Huggins, Chappuis and Wolf bands. SCIAMACHY's total ozone columns retrieved using the revised cross section data are shown to be within 1% compared to the ozone amounts retrieved routinely from SCIAMACHY.

Ozone absorption cross section measurements in the Wulf bands

1993 ◽  
Vol 20 (15) ◽  
pp. 1579-1582 ◽  
Author(s):  
Stuart M. Anderson ◽  
Peter Hupalo ◽  
Konrad Mauersberger
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Ozone Absorption

scholarly journals Absolute ozone absorption cross section in the Huggins Chappuis minimum (350–470 nm) at 296 K

2011 ◽  
Vol 11 (8) ◽  
pp. 21655-21676 ◽  
Author(s):  
J. L. Axson ◽  
R. A. Washenfelder ◽  
T. F. Kahan ◽  
C. J. Young ◽  
V. Vaida ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Measured Cross Section ◽  
Ozone Absorption ◽  
Enhanced Absorption ◽  
Vapor Partial Pressure ◽  
Order Of Magnitude ◽  
Water Vapor Partial Pressure ◽  
Absorption Spectrometer

Abstract. We report the ozone absolute absorption cross section between 350–470 nm, the minimum between the Huggins and Chappuis bands, where the ozone cross section is less than 10−22 cm2. Ozone spectra were acquired using an incoherent broadband cavity enhanced absorption spectrometer, with three channels centered at 365, 405, and 455 nm. The accuracy of the measured cross section is 2 %. Previous measurements vary by more than an order of magnitude in this spectral region. The measurements reported here provide much greater spectral coverage than the most recent measurements. We report a minimum absorption cross section of 3.4×10−24 cm2 at 381.8 nm, which is 22 % lower than the previously reported value. The effect of O3 concentration and water vapor partial pressure were investigated, however there were no observable changes in the absorption spectrum most likely due to the low optical density of the complex.

scholarly journals A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength

2017 ◽  
Author(s):  
Christof Janssen ◽  
Hadj Elandaloussi ◽  
Julian Gröbner
Keyword(s):  
Remote Sensing ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Remote Sensing Data ◽  
Laser Wavelength ◽  
Careful Consideration ◽  
Absorption Cross ◽  
Ozone Absorption ◽  
Relative Temperature ◽  
Relative Level

Abstract. The room temperature (294.09 K) absorption cross section of ozone at the 325 nm HeCd wavelength has been determined under careful consideration of possible biases. At the vacuum wavelength of 325.126 nm, thus in a region used by a variety of ozone remote sensing techniques, an absorption cross section value of σ = 16.470 · 10−21 cm2 was measured. The measurement provides the currently most accurate direct photometric absorption value of ozone in the UV with an expanded (coverage factor k = 2) uncertainty u(σ) = 31 · 10−24 cm2, corresponding to a relative level of two per mil. The measurements are most compatible with a relative temperature coefficient cT = (1 / σ) dσ / dT = 0.0031 K−1 at 294 K. The cross section and its uncertainty value have been obtained from a generalised linear regression with correlated uncertainties. It will serve as a reference for ozone absorption spectra required for the long-term remote sensing of atmospheric ozone in the Huggins bands. The comparison with commonly used absorption cross section data sets for remote sensing reveals a possible bias of about 2 %. This could partly explain a 4 % discrepancy between UV and IR remote sensing data and indicates that further studies will be required to reach the accuracy goal of 1 % in atmospheric reference spectra.

scholarly journals Absolute ozone absorption cross section in the Huggins Chappuis minimum (350–470 nm) at 296 K

2011 ◽  
Vol 11 (22) ◽  
pp. 11581-11590 ◽  
Author(s):  
J. L. Axson ◽  
R. A. Washenfelder ◽  
T. F. Kahan ◽  
C. J. Young ◽  
V. Vaida ◽  
...  
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Measured Cross Section ◽  
Ozone Absorption ◽  
Enhanced Absorption ◽  
Vapor Partial Pressure ◽  
Order Of Magnitude ◽  
Water Vapor Partial Pressure ◽  
Absorption Spectrometer

Abstract. We report the ozone absolute absorption cross section between 350–470 nm, the minimum between the Huggins and Chappuis bands, where the ozone cross section is less than 10−22 cm2. Ozone spectra were acquired using an incoherent broadband cavity enhanced absorption spectrometer, with three channels centered at 365, 405, and 455 nm. The accuracy of the measured cross section is 4–30%, with the greatest uncertainty near the minimum absorption at 375–390 nm. Previous measurements vary by more than an order of magnitude in this spectral region. The measurements reported here provide much greater spectral coverage than the most recent measurements. The effect of O3 concentration and water vapor partial pressure were investigated, however there were no observable changes in the absorption spectrum most likely due to the low optical density of the complex.

Measurement of the ozone absorption cross-section at the 253.7 nm mercury line

1986 ◽  
Vol 13 (7) ◽  
pp. 671-673 ◽  
Author(s):  
K. Mauersberger ◽  
J. Barnes ◽  
D. Hanson ◽  
J. Morton
Keyword(s):  
Cross Section ◽  
Absorption Cross Section ◽  
Absorption Cross ◽  
Ozone Absorption
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