Erlangen 2018 – scientific programme

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UP: Fachverband Umweltphysik

UP 8: Methods - measurement techniques; Atmosphere - trace gases, mesosphere

UP 8.5: Talk

Wednesday, March 7, 2018, 15:00–15:15, G 1.011

Validation of the extended Multiple Airglow Chemistry model with in-situ measurements of the Energy Transfer in the Oxygen Nightglow campaign — •Olexandr Lednyts’kyy¹, Christian von Savigny¹, and Edward Llewellyn² — ¹Ernst-Moritz-Arndt-University of Greifswald, Greifswald, Germany — ²University of Saskatchewan, Saskatoon, Canada

Coupling of electronically excited states of molecular and atomic oxygen (O₂ and O) with each other through collisions was implemented in the Multiple Airglow Chemistry (MAC) model to reflect the photochemistry in the upper Mesosphere and Lower Thermosphere (MLT) region. Additionally, temperature, concentrations of O₂ and molecular nitrogen were simulated with the NRLMSISE-00 model and used in the MAC model to retrieve concentrations of MLT minor species based on airglow emissions. The MAC model was extended with two upper Herzberg states that allowed the excitation of the green line emission to be explained and refuted the concept of integrity of identity of the O₂ electronic states. The photochemical models of McDade et al. were tuned using in-situ measurements of the Energy Transfer in the Oxygen Nightglow (ETON) campaign conducted in March 1982. The developed, and verified, extended cubic equation (ECE) was based on quenching processes that were in addition to those of McDade et al. The ECE results in overestimated [O], the McDade et al. models result in underestimated [O] while the extended MAC model results in [O] in the best agreement with ETON in-situ [O].