Journal cover Journal topic
Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

Journal metrics

  • IF value: 3.089 IF 3.089
  • IF 5-year<br/> value: 3.700 IF 5-year
    3.700
  • CiteScore<br/> value: 3.59 CiteScore
    3.59
  • SNIP value: 1.273 SNIP 1.273
  • SJR value: 2.026 SJR 2.026
  • IPP value: 3.082 IPP 3.082
  • h5-index value: 45 h5-index 45
https://doi.org/10.5194/amt-2017-311
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
04 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).
A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength
Christof Janssen1, Hadj Elandaloussi1, and Julian Gröbner2 1LERMA-IPSL, Sorbonne Universités, UPMC Univ. Paris 06, CNRS, Observatoire de Paris, PSL Research University, 75005 Paris, France
2Physikalisches Meteorologisches Observatorium Davos, World Radiation Center, Davos Dorf, Switzerland
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.

Citation: Janssen, C., Elandaloussi, H., and Gröbner, J.: A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2017-311, in review, 2017.
Christof Janssen et al.
Christof Janssen et al.
Christof Janssen et al.

Viewed

Total article views: 216 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
158 55 3 216 3 2

Views and downloads (calculated since 04 Oct 2017)

Cumulative views and downloads (calculated since 04 Oct 2017)

Viewed (geographical distribution)

Total article views: 216 (including HTML, PDF, and XML)

Thereof 216 with geography defined and 0 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 12 Dec 2017
Publications Copernicus
Download
Short summary
Monitoring ozone layer recovery at a rate of few percent per decade requires dedicated instrumentation and spectroscopic data of the highest quality. Highly accurate absorption cross sections of ozone are rare, especially in the important UV region between 300 and 340 nm. Our measurement provides the first reference point with permil level of accuracy in this range. Interestingly, our value is lower than currently used data. This might resolve an inconsistency between UV and IR measurements.
Monitoring ozone layer recovery at a rate of few percent per decade requires dedicated...
Share