Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica
Rotational temperatures derived from the OH(8–3) band may vary by ~18K depending on the choice of transition probabilities. This is of concern when absolute temperatures or trends determined in combination with measurements of other hydroxyl bands are important. In this paper, measurements of the OH...
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ftcopernicus:oai:publications.copernicus.org:angeo35186 2023-05-15T13:36:36+02:00 Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica Phillips, F. Burns, G. B. French, W. J. R. Williams, P. F. B. Klekociuk, A. R. Lowe, R. P. 2018-09-27 application/pdf https://doi.org/10.5194/angeo-22-1549-2004 https://angeo.copernicus.org/articles/22/1549/2004/ eng eng doi:10.5194/angeo-22-1549-2004 https://angeo.copernicus.org/articles/22/1549/2004/ eISSN: 1432-0576 Text 2018 ftcopernicus https://doi.org/10.5194/angeo-22-1549-2004 2020-07-20T16:27:36Z Rotational temperatures derived from the OH(8–3) band may vary by ~18K depending on the choice of transition probabilities. This is of concern when absolute temperatures or trends determined in combination with measurements of other hydroxyl bands are important. In this paper, measurements of the OH(8–3) temperature-insensitive Q/P and R/P line intensity ratios are used to select the most appropriate transition probabilities for use with this band. Aurora, airglow and solar and telluric absorption in the OH(8–3) band are also investigated. Water vapour absorption of P 1 (4), airglow or auroral contamination of P 1 (2) and solar absorption in the vicinity of P 1 (5) are concerns to be considered when deriving rotational temperatures from this band. A comparison is made of temperatures derived from OH(6–2) and OH(8–3) spectra collected alternately at Davis (69° S, 78° E) in 1990. An average difference of ~4K is found, with OH(8–3) temperatures being warmer, but a difference of this magnitude is within the two sigma uncertainty limit of the measurements. Key words. Atmospheric composition and structure airglow and aurora; pressure, density, and temperature) Text Antarc* Antarctica Copernicus Publications: E-Journals Annales Geophysicae 22 5 1549 1561 |
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ftcopernicus |
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English |
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Rotational temperatures derived from the OH(8–3) band may vary by ~18K depending on the choice of transition probabilities. This is of concern when absolute temperatures or trends determined in combination with measurements of other hydroxyl bands are important. In this paper, measurements of the OH(8–3) temperature-insensitive Q/P and R/P line intensity ratios are used to select the most appropriate transition probabilities for use with this band. Aurora, airglow and solar and telluric absorption in the OH(8–3) band are also investigated. Water vapour absorption of P 1 (4), airglow or auroral contamination of P 1 (2) and solar absorption in the vicinity of P 1 (5) are concerns to be considered when deriving rotational temperatures from this band. A comparison is made of temperatures derived from OH(6–2) and OH(8–3) spectra collected alternately at Davis (69° S, 78° E) in 1990. An average difference of ~4K is found, with OH(8–3) temperatures being warmer, but a difference of this magnitude is within the two sigma uncertainty limit of the measurements. Key words. Atmospheric composition and structure airglow and aurora; pressure, density, and temperature) |
format |
Text |
author |
Phillips, F. Burns, G. B. French, W. J. R. Williams, P. F. B. Klekociuk, A. R. Lowe, R. P. |
spellingShingle |
Phillips, F. Burns, G. B. French, W. J. R. Williams, P. F. B. Klekociuk, A. R. Lowe, R. P. Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
author_facet |
Phillips, F. Burns, G. B. French, W. J. R. Williams, P. F. B. Klekociuk, A. R. Lowe, R. P. |
author_sort |
Phillips, F. |
title |
Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
title_short |
Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
title_full |
Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
title_fullStr |
Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
title_full_unstemmed |
Determining rotational temperatures from the OH(8-3) band, and a comparison with OH(6-2) rotational temperatures at Davis, Antarctica |
title_sort |
determining rotational temperatures from the oh(8-3) band, and a comparison with oh(6-2) rotational temperatures at davis, antarctica |
publishDate |
2018 |
url |
https://doi.org/10.5194/angeo-22-1549-2004 https://angeo.copernicus.org/articles/22/1549/2004/ |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
eISSN: 1432-0576 |
op_relation |
doi:10.5194/angeo-22-1549-2004 https://angeo.copernicus.org/articles/22/1549/2004/ |
op_doi |
https://doi.org/10.5194/angeo-22-1549-2004 |
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Annales Geophysicae |
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22 |
container_issue |
5 |
container_start_page |
1549 |
op_container_end_page |
1561 |
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1766081594859192320 |