Regensburg 2016 – wissenschaftliches Programm

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UP: Fachverband Umweltphysik

UP 15: Methods - Measurement Techniques

UP 15.3: Vortrag

Donnerstag, 10. März 2016, 15:45–16:00, H41

High-resolution turbulence observations in the stratosphere with LITOS — •Jens Söder, Michael Gerding, Andreas Schneider, and Franz-Josef Lübken — Leibniz-Institut für Atmosphärenphysik an der Universität Rostock, Kühlungsborn

Many studies show that gravity waves dissipate a distinct amount of energy while propagating through the stratosphere, even if this region is in general statically and dynamically stable. For studies of stratospheric turbulence and wave dissipation we have developed the balloon-borne instrument LITOS (Leibniz-Institute Turbulence Observations in the Stratosphere), resolving structures in the atmospheric wind field down to the scales of millimeters. LITOS data cover both the inertial and viscous subrange of the energy spectrum, allowing for the most direct calculation of energy dissipation rates. Recently, a new version of LITOS has been developed that can be launched from every radiosonde station. We have performed several flights from Kühlungsborn/Germany (54°N, 12°E), thereof one during nighttime. Various turbulent layers with a vertical thickness in the order of a few 10 m have been observed. Stratospheric energy dissipation rates greatly vary within only a few tens of meters, roughly between 1e-7 and 10 W/kg, with a mean value of roughly 1e-3 W/kg. Huge differences have been found in the altitudinal structure and strength of stratospheric turbulence during the different flights. The outcome of the flights will be discussed in their geophysical context. Furthermore, first results from the METROSI-LITOS campaign at Andenes/Norway (69°N, 16°E) in January 2016 are presented.