Polar mesospheric summer echoes and noctilucent clouds (PMSE und NLC)

The observation of PMSE and NLC is one of the very few ways to explore the mesopause in the summer. With modern radar, lidar and camera techniques of the IAP it is possible to measure the structure of these layered phenomena within a few seconds. By this high-frequency gravity waves, instabilities and the transition to turbulence is observed. Both PMSE and NLC are a consequence or consist of ice particles. These layers are also investigated by means of 3-dimensional microphysical modeling. By combining observations and modeling processes in the atmosphere are investigated. This allows studying processes on time scales of seconds to several years.
Speakers: Dr. G. Baumgarten und Irina Strelnikova
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Stratospheric warmings

Sudden stratospheric warmings are prominent and impressive examples for vertical coupling processes. While the temperature increases by up to 80 Kelvin in the stratosphere, it decreases by up to 30 Kelvin at the same time in the mesosphere. These effects are caused by planetary Rossby waves and mesoscale gravity waves interacting with the mean flow. The focus of the matrix group currently lies on the so-called final warmings setting the stage for the final transition from the winter circulation to the summer circulation. For this study we combine local and global observations as well as assimilated model data and complement it with model studies.
Speaker: Dr. Ch. Zülicke
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