Heidelberg 2015 – scientific programme
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UP: Fachverband Umweltphysik
UP 2: Atmosphäre
UP 2.14: Talk
Wednesday, March 25, 2015, 14:00–14:15, G/gHS
Retrieval of metal atom and ion number densities in the mesosphere and lower thermosphere from SCIAMACHY/Envisat limb MLT measurements — •Martin Langowski1,4, Christian von Savigny1, Miriam Sinnhuber2, Art C. Aikin3, and John P. Burrows4 — 1EMAU Greifswald — 2KIT-IMK-ASF, Karlsruhe — 3CUA Washington D.C. — 4IUP Uni Bremen
Most meteoroids entering the earth atmosphere ablate in between 80 and 120 km altitude. This leads to an injection of metals into this altitude region and finally to a formation of metal atom and ion layers.
The metal atoms and ions show very strong resonance fluorescence signals, which, e.g., can be detected with the SCIAMACHY grating spectrometer on Envisat. This emission is used to retrieve the densities of these species, and global densities retrieved on an altitude and latitude grid for Mg,Mg+ and Na are obtained so far.
We will present these result and will discuss the vertical, seasonal and latitudinal variations as well as the involved physical and chemical processes.