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| DOI | 10.5194/acp-19-2629-2019 |
| Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements | |
| Kalogerakis K.S. | |
| 发表日期 | 2019 |
| ISSN | 16807316 |
| 起始页码 | 2629 |
| 结束页码 | 2634 |
| 卷号 | 19期号:4 |
| 英文摘要 | Emissions from the OH Meinel bands are routinely used to determine rotational temperatures that are considered proxies for the kinetic temperature near the mesopause region. Previous observations determined OH rotational temperatures that show a dependence on the vibrational level, with the temperature rising overall as the OH vibrational quantum number v increases. The source of this trend is not well understood and has generally been attributed to deviations from thermodynamic equilibrium. This technical note demonstrates that the existence of bimodal OH rotational population distributions is an inherent feature of rotational relaxation in gases and can provide an explanation for the previously reported temperature trend. The use of only a few lines from rotational transitions involving low rotational quantum numbers to determine rotational temperatures does not account for the bimodality of the OH rotational population distributions and leads to systematic errors overestimating the OH rotational temperature. This note presents selected examples, discusses the relevant implications, and considers strategies that could lead to more reliable OH rotational temperature determination. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License. |
| 语种 | 英语 |
| scopus关键词 | air temperature; atmospheric chemistry; emission; hydroxyl radical; measurement method; mesopause; mesosphere; trend analysis |
| 来源期刊 | Atmospheric Chemistry and Physics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/144610 |
| 作者单位 | Center for Geospace Studies, SRI International, Menlo Park, CA, United States |
| 推荐引用方式 GB/T 7714 | Kalogerakis K.S.. Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements[J],2019,19(4). |
| APA | Kalogerakis K.S..(2019).Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements.Atmospheric Chemistry and Physics,19(4). |
| MLA | Kalogerakis K.S.."Technical note: Bimodality in mesospheric OH rotational population distributions and implications for temperature measurements".Atmospheric Chemistry and Physics 19.4(2019). |
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