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Climatologies of Various OH Lines From About 90,000 X-Shooter Spectra

Noll, Noll and Schmidt, Carsten and Kausch, Wolfgang and Bittner, Michael and Kimeswenger, Stefan (2023) Climatologies of Various OH Lines From About 90,000 X-Shooter Spectra. Journal of Geophysical Research: Atmospheres, 128 (9), pp. 1-26. Wiley. doi: 10.1029/2022JD038275. ISSN 2169-897X.

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The nocturnal mesopause region of the Earth's atmosphere radiates chemiluminescent emission from various roto-vibrational bands of hydroxyl (OH), which is therefore a good tracer of the chemistry and dynamics at the emission altitudes. Intensity variations can, for example, be caused by the general circulation, gravity waves, tides, planetary waves, and the solar activity. While the basic OH response to the different dynamical influences has been studied quite frequently, detailed comparisons of the various individual lines are still rare. Such studies can improve our understanding of the OH-related variations as each line shows a different emission profile. We have therefore used about 90,000 spectra of the X-shooter spectrograph of the Very Large Telescope at Cerro Paranal in Chile in order to study 10 years of variations of 298 OH lines. The analysis focuses on climatologies of intensity, solar cycle effect (SCE), and residual variability (especially with respect to time scales of hours and about 2 days) for day of year and local time. For a better understanding of the resulting variability patterns and the line-specific differences, we applied decomposition techniques, studied the variability depending on time scale, and calculated correlations. As a result, the mixing of thermalized and nonthermalized OH level populations clearly influences the amplitude of the variations. Moreover, the local times of the variability features shift depending on the effective line emission height, which can mainly be explained by the propagation of the migrating diurnal tide. This behavior also contributes to remarkable differences in the effective SCE.

Item URL in elib:https://elib.dlr.de/196248/
Document Type:Article
Title:Climatologies of Various OH Lines From About 90,000 X-Shooter Spectra
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Schmidt, CarstenUNSPECIFIEDhttps://orcid.org/0000-0002-9580-724X139591586
Kausch, WolfgangInstitut für Astro- und Teilchenphysik, Universität Innsbruck, Innsbruck, AustriaUNSPECIFIEDUNSPECIFIED
Bittner, MichaelUNSPECIFIEDhttps://orcid.org/0000-0003-4293-930XUNSPECIFIED
Date:17 April 2023
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-26
Keywords:airglow, hydroxyl, mesosphere, x-shooter spectra, oh
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Remote Sensing and Geo Research
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Atmosphere
Deposited By: Bittner, Prof.Dr.rer.nat. Michael
Deposited On:31 Jul 2023 11:49
Last Modified:18 Oct 2023 07:56

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