Articles | Volume 20, issue 1
Atmos. Chem. Phys., 20, 333–343, 2020
https://doi.org/10.5194/acp-20-333-2020
Atmos. Chem. Phys., 20, 333–343, 2020
https://doi.org/10.5194/acp-20-333-2020

Research article 09 Jan 2020

Research article | 09 Jan 2020

Modelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurements

Christoph Franzen et al.

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Short summary
Ground-based observations of the hydroxyl (OH) airglow have indicated that the rotational energy levels may not be in thermal equilibrium with the surrounding gas. Here we use simulations of the OH airglow to show that temperature changes across the extended airglow layer, either climatological or those temporarily caused by atmospheric waves, can mimic this effect for thermalized OH. Thus, these must be considered in order to quantify the non-thermal nature of the OH airglow.
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