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dc.contributor.authorFranzen, Christoph
dc.contributor.authorEspy, Patrick Joseph
dc.contributor.authorHibbins, Robert
dc.identifier.citationAtmospheric Chemistry and Physics. 2020, 20 333-343.nb_NO
dc.description.abstractSpectroscopy 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.nb_NO
dc.publisherEuropean Geosciences Unionnb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleModelled effects of temperature gradients and waves on the hydroxyl rotational distribution in ground-based airglow measurementsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalAtmospheric Chemistry and Physicsnb_NO
dc.relation.projectNorges forskningsråd: 223252nb_NO
dc.description.localcode© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.nb_NO
cristin.unitnameInstitutt for fysikk

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal