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| Titel |
LITOS – a new balloon-borne instrument for fine-scale turbulence soundings in the stratosphere |
| VerfasserIn |
A. Theuerkauf, M. Gerding, F.-J. Lübken |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 1 ; Nr. 4, no. 1 (2011-01-20), S.55-66 |
| Datensatznummer |
250001567
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| Publikation (Nr.) |
 copernicus.org/amt-4-55-2011.pdf |
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| Zusammenfassung |
| We have developed a new compact balloon payload called LITOS
(Leibniz-Institute Turbulence Observations in the Stratosphere) for high
resolution wind turbulence soundings in the stratosphere up to 35 km altitude. The wind
measurements are performed using a constant temperature anemometer (CTA)
with a vertical resolution of ~2.5 mm, i.e. 2 kHz sampling rate at
5 m/s ascent speed. Thereby, for the first time, it is possible to study the
entire turbulence spectrum down to the viscous subrange in the stratosphere.
Including telemetry, housekeeping, batteries and recovery unit, the payload
weighs less than 5 kg and can be launched from any radiosonde station. Since
autumn 2007, LITOS has been successfully launched several times from the
Leibniz-Institute of Atmospheric Physics (IAP) in Kühlungsborn, Germany
(54° N, 12° E). Two additional soundings were carried out in
2008 and 2009 in Kiruna, Sweden (67° N, 21° E) as part of the
BEXUS program (Balloon-borne EXperiments for University Students). We
describe here the basic principle of CTA measurements and prove the validity
of this method in the stratosphere. A first case study allows a clear
distinction between non-turbulent regions and a turbulent layer with a
thickness of some tens of meters. Since our measurements cover the transition
between the inertial and viscous subrange, energy dissipation rates can be
calculated with high reliability. |
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