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We have developed a new compact balloon payload called LITOS(Leibniz-Institute Turbulence Observations in the Stratosphere) for highresolution wind turbulence soundings in the stratosphere up to 35 km altitude. The windmeasurements are performed using a constant temperature anemometer (CTA)with a vertical resolution of ~2.5 mm, i.e. 2 kHz sampling rate at5 m/s ascent speed. Thereby, for the first time, it is possible to study theentire turbulence spectrum down to the viscous subrange in the stratosphere.Including telemetry, housekeeping, batteries and recovery unit, the payloadweighs less than 5 kg and can be launched from any radiosonde station. Sinceautumn 2007, LITOS has been successfully launched several times from theLeibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn, Germany(54° N, 12° E). Two additional soundings were carried out in2008 and 2009 in Kiruna, Sweden (67° N, 21° E) as part of theBEXUS program (Balloon-borne EXperiments for University Students). Wedescribe here the basic principle of CTA measurements and prove the validityof this method in the stratosphere. A first case study allows a cleardistinction between non-turbulent regions and a turbulent layer with athickness of some tens of meters. Since our measurements cover the transitionbetween the inertial and viscous subrange, energy dissipation rates can becalculated with high reliability

LITOS – a new balloon-borne instrument for fine-scale turbulence soundings in the stratosphere