The dynamics of internal wave motions and their relation to mixing were investigated with a high-resolution data set from two cruises in the Baltic Sea. In the absence of tides, the basin-scale energetics were governed by wind-generated, low-mode, near-inertial wave motions. A large storm increased the energy in the entire internal wave frequency range, especially near the buoyancy frequency. This thesis shows that internal waves were energetic at a wide range of frequencies and the main mixing mechanism in the interior of the deep Baltic Sea basin.
