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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00104399-11
00104399-1.pdf
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The temporal variability of the OH* airglow layer: A study based on Fourier Transform Spectroscopy and mesospheric models


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Other Titles: Die zeitliche Variabilität der OH* Airglow-Schicht: Eine Studie basierend auf Fourier-Transform-Spektroskopie und mesosphärischen Modellen
Authors: Kowalewski, Stefan 
Supervisor: Palm, Mathias 
1. Expert: Notholt, Justus  
2. Expert: von Savigny, Christian
Abstract: 
This work investigates the mesospheric OH* airglow layer. Ground-based observations of its Meinel emission are performed by means of Fourier Transform Spectroscopy at the AWIPEV station, Spitsbergen. Gas kinetic ambient temperatures are derived from the recorded spectra and compared with other data sets, indicating a rather persistent negative temperature offset to co-located spaceborne observations. Furthermore, temperature/brightness fluctuations serve as a diagnostic tool for wave driven perturbations of the OH* airglow layer due to its adiabatic/chemical response. Evidence of a vertical coupling with the lower atmospheric fraction is found on some occasions, corroborating current theories on the wave-mean-flow-interaction as the important driver of mesospheric dynamics. Finally, this work performed gas kinetic simulations, revealing the importance of the combined effect of the O and O2 quenching on the temporal modulation of vertical shifts between different OH* Meinel bands.
Keywords: mesosphere, airglow, hydroxyl layer, atmospheric waves, mesopause temperatures
Issue Date: 18-Mar-2015
Type: Dissertation
URN: urn:nbn:de:gbv:46-00104399-11
Institution: Universität Bremen 
Faculty: FB1 Physik/Elektrotechnik 
Appears in Collections:Dissertationen

  

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