气候变化领域集成服务门户(CCPortal): Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements

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DOI	10.5194/acp-20-333-2020
	Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements
	Franzen C.; Joseph Espy P.; Edward Hibbins R.
发表日期	2020
ISSN	16807316
起始页码	333
结束页码	343
卷号	20 期号:1
英文摘要	Spectroscopy of the hydroxyl (OH) airglow has been a commonly used way to remotely sense temperatures in the mesopause region for many decades. This technique relies on the OH rotational state populations to be thermalized through collisions with the surrounding gas into a Boltzmann distribution characterized by the local temperature. However, deviations of the rotational populations from a Boltzmann distribution characterized by a single temperature have been observed and attributed to an incomplete thermalization of the OH from its initial, non-thermodynamic-equilibrium distribution. Here we address an additional cause for the apparent amount of excess population in the higher rotational levels of the OH airglow brought about by integrating these OH emissions through vertical gradients in the atmospheric temperature. We find that up to 40% of the apparent excess population, currently attributed to incomplete thermalization, can be due to the vertical temperature gradients created by waves. Additionally, we find that the populations of the different upper vibrational levels are affected differently. These effects need to be taken into account in order to assess the true extent of non-thermodynamic-equilibrium effects on the OH rotational populations. © 2020 Author(s).
关键词	airglow atmospheric wave ground-based measurement hydroxyl radical temperature effect temperature gradient
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132309
推荐引用方式 GB/T 7714	Franzen C.,Joseph Espy P.,Edward Hibbins R.. Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements[J]. Atmospheric Chemistry and Physics,2020,20(1).
APA	Franzen C.,Joseph Espy P.,&Edward Hibbins R..(2020).Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements.,20(1).
MLA	Franzen C.,et al."Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements".20.1(2020).