Jena 2013 – wissenschaftliches Programm
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UP: Fachverband Umweltphysik
UP 3: Methoden - Fernerkundung, Messverfahren und Datenauswertung
UP 3.4: Hauptvortrag
Dienstag, 26. Februar 2013, 16:00–16:30, HS 5
Variability and vertical shifts in OH Meinel emissions near the mesopause: results from SCIAMACHY on Envisat — •Christian von Savigny1, Ian McDade2, Kai-Uwe Eichmann3, and John Burrows3 — 1Institut für Physik, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany — 2Centre for Research in Earth and Space Science (CRESS), York University, Toronto, Ontario, Canada — 3Institut für Umweltphysik, Universität Bremen, Bremen, Germany
One of the standard techniques to remotely sense mesopause temperatures from the ground is based on spectroscopic measurements of vibrational-rotational emission bands of the OH molecule. Temporal and spatial variability of the altitude and shape of the OH emission layer complicates the interpretation of the temperature records. In this study we use SCIAMACHY/Envisat measurements of different OH emission bands to (a) characterize the spatial and temporal variability of the OH emission altitude, (b) investigate possible altitude shifts between OH bands originating from different vibrational levels. Evidence for systematic vertical shifts is presented, and is shown to be consistent with model simulations. The importance of quenching by atomic oxygen for the vertical shifts is demonstrated based on SCIAMACHY measurements. The SCIAMACHY data record shows no evidence for significant long-term or solar cycle variations of the annually averaged OH emission altitudes.