Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations
<p>Absorption of light in the atmosphere by collision-induced absorption (CIA) by two oxygen molecules O<span class="inline-formula"><sub>2</sub></span>–O<span class="inline-formula"><sub>2</sub></span>, in the following refer...
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Copernicus Publications
2025-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | https://amt.copernicus.org/articles/18/3393/2025/amt-18-3393-2025.pdf |
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| author | B. Lauster B. Lauster U. Frieß J.-M. Nasse J.-M. Nasse U. Platt T. Wagner T. Wagner |
| author_facet | B. Lauster B. Lauster U. Frieß J.-M. Nasse J.-M. Nasse U. Platt T. Wagner T. Wagner |
| author_sort | B. Lauster |
| collection | DOAJ |
| description | <p>Absorption of light in the atmosphere by collision-induced absorption (CIA) by two oxygen molecules O<span class="inline-formula"><sub>2</sub></span>–O<span class="inline-formula"><sub>2</sub></span>, in the following referred to as O<span class="inline-formula"><sub>4</sub></span>, can be used to derive properties of aerosols and clouds from remote sensing observations. In recent years, inconsistencies between the measured atmospheric O<span class="inline-formula"><sub>4</sub></span> absorption and radiative transfer simulations were found for Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements. In the presented study, over two years of observations from a long-path (LP-) DOAS instrument deployed at the German research station Neumayer, Antarctica, are analysed. While MAX-DOAS instruments measure spectra of scattered sunlight at different elevation angles, LP-DOAS utilises an artificial light source and the atmospheric absorptions are measured along a fixed (and well-defined) light path close to the surface. Further, the pristine measurement location allows one to investigate the relation between measured and modelled O<span class="inline-formula"><sub>4</sub></span> absorption over a large range of temperatures (<span class="inline-formula">−45</span> to +5 °C). Overall good agreement is found between the retrieved O<span class="inline-formula"><sub>4</sub></span> absorption cross-sections covering the absorption band at 360 nm and laboratory measurements. While the best agreement is obtained for the <span class="cit" id="xref_text.1"><a href="#bib1.bibx2">Finkenzeller and Volkamer</a> (<a href="#bib1.bibx2">2022</a>)</span> cross-sections, deviations at cold ambient temperatures (below ca. <span class="inline-formula">−25</span> °C) are observed for the <span class="cit" id="xref_text.2"><a href="#bib1.bibx28">Thalman and Volkamer</a> (<a href="#bib1.bibx28">2013</a>)</span> cross-sections. Other O<span class="inline-formula"><sub>4</sub></span> absorption bands could not be investigated because these are not (fully) within the spectral range of the measured spectra. This study strongly supports the accuracy of commonly used O<span class="inline-formula"><sub>4</sub></span> absorption cross-sections in DOAS analyses, while more work is needed to understand the earlier reported inconsistencies in MAX-DOAS observations.</p> |
| format | Article |
| id | doaj-art-85bc5d151cce45c8aa4bac7fc7a784a8 |
| institution | Kabale University |
| issn | 1867-1381 1867-8548 |
| language | English |
| publishDate | 2025-07-01 |
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| series | Atmospheric Measurement Techniques |
| spelling | doaj-art-85bc5d151cce45c8aa4bac7fc7a784a82025-08-20T03:32:54ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482025-07-01183393340510.5194/amt-18-3393-2025Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observationsB. Lauster0B. Lauster1U. Frieß2J.-M. Nasse3J.-M. Nasse4U. Platt5T. Wagner6T. Wagner7Satellite Remote Sensing Group, Max Planck Institute for Chemistry, Mainz, GermanyInstitute for Environmental Physics, University of Heidelberg, Heidelberg, GermanyInstitute for Environmental Physics, University of Heidelberg, Heidelberg, GermanyInstitute for Environmental Physics, University of Heidelberg, Heidelberg, Germanynow at: Energie Baden-Württemberg AG, Karlsruhe, GermanyInstitute for Environmental Physics, University of Heidelberg, Heidelberg, GermanySatellite Remote Sensing Group, Max Planck Institute for Chemistry, Mainz, GermanyInstitute for Environmental Physics, University of Heidelberg, Heidelberg, Germany<p>Absorption of light in the atmosphere by collision-induced absorption (CIA) by two oxygen molecules O<span class="inline-formula"><sub>2</sub></span>–O<span class="inline-formula"><sub>2</sub></span>, in the following referred to as O<span class="inline-formula"><sub>4</sub></span>, can be used to derive properties of aerosols and clouds from remote sensing observations. In recent years, inconsistencies between the measured atmospheric O<span class="inline-formula"><sub>4</sub></span> absorption and radiative transfer simulations were found for Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements. In the presented study, over two years of observations from a long-path (LP-) DOAS instrument deployed at the German research station Neumayer, Antarctica, are analysed. While MAX-DOAS instruments measure spectra of scattered sunlight at different elevation angles, LP-DOAS utilises an artificial light source and the atmospheric absorptions are measured along a fixed (and well-defined) light path close to the surface. Further, the pristine measurement location allows one to investigate the relation between measured and modelled O<span class="inline-formula"><sub>4</sub></span> absorption over a large range of temperatures (<span class="inline-formula">−45</span> to +5 °C). Overall good agreement is found between the retrieved O<span class="inline-formula"><sub>4</sub></span> absorption cross-sections covering the absorption band at 360 nm and laboratory measurements. While the best agreement is obtained for the <span class="cit" id="xref_text.1"><a href="#bib1.bibx2">Finkenzeller and Volkamer</a> (<a href="#bib1.bibx2">2022</a>)</span> cross-sections, deviations at cold ambient temperatures (below ca. <span class="inline-formula">−25</span> °C) are observed for the <span class="cit" id="xref_text.2"><a href="#bib1.bibx28">Thalman and Volkamer</a> (<a href="#bib1.bibx28">2013</a>)</span> cross-sections. Other O<span class="inline-formula"><sub>4</sub></span> absorption bands could not be investigated because these are not (fully) within the spectral range of the measured spectra. This study strongly supports the accuracy of commonly used O<span class="inline-formula"><sub>4</sub></span> absorption cross-sections in DOAS analyses, while more work is needed to understand the earlier reported inconsistencies in MAX-DOAS observations.</p>https://amt.copernicus.org/articles/18/3393/2025/amt-18-3393-2025.pdf |
| spellingShingle | B. Lauster B. Lauster U. Frieß J.-M. Nasse J.-M. Nasse U. Platt T. Wagner T. Wagner Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations Atmospheric Measurement Techniques |
| title | Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations |
| title_full | Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations |
| title_fullStr | Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations |
| title_full_unstemmed | Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations |
| title_short | Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations |
| title_sort | assessment of laboratory o sub 4 sub o sub 2 sub o sub 2 sub collision induced absorption cross sections at 360 thinsp nm using atmospheric long path doas observations |
| url | https://amt.copernicus.org/articles/18/3393/2025/amt-18-3393-2025.pdf |
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