The physical processes in the climate system span an enormous range of spatial and temporal scales. The spatial scales range from several thousand kilometers down to synoptic-, meso- or even micro-scales. The corresponding atmospheric motions involve planetary Rossby waves, midlatitudinal weather systems, tropical cyclones, mountain-triggered gravity waves, tornadoes, turbulence and micro-scale cloud processes. In AOSS, we study the atmospheric motions, assess their governing equations, investigate the complex interplay between the scales, study ocean dynamics, and model the general circulation of the atmosphere and employ Direct Numerical Simulation (DNS) techniques. In addition, we research upper atmospheric dynamical phenomena like the Quasi-Biennial Oscillation, traveling tropical waves and wave-mean flow interactions.