Heidelberg 2015 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 2: Atmosphäre

UP 2.14: Vortrag

Mittwoch, 25. März 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 Langowski^1,4, 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.