Matrix groups at IAP

At the Leibniz Institute of Atmospheric Physics have been established three independent Matrix research groups which are dealing with the following topics:

Waves and Turbulence

Turbulence is an integral part of the physics of the atmosphere and climate.  Many phenomena are linked to turbulence, e.g. the breaking of atmospheric waves like gravity waves which couples the different flow components of the atmosphere; or the mixing of tracers by the transient and dissipative impact of waves. Furthermore, turbulence connects global dynamics with the viscous scales; and NLC, PMSE, and the formation of ice layers are subject to modifications caused by gravity waves and turbulence.
Speakers: Dr. U. Schaefer-Rolffs and Dr. B. Strelnikov
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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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Wave processes and global circulation

The interaction between waves and circulation is of central importance for the dynamics of the middle atmosphere. Currently we study in the matrix group sudden stratospheric warmings, which often are associated with mesospheric coolings. Such specific events are the result of the vertical coupling by Rossby and gravity waves, whereby anomalies in the global circulation and long-term changes also play a role. By the combination of experimental and theoretical findings we aim to study details of the temporal and spatial structure.
Speaker: Dr. Ch. Zülicke
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