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| Titel |
The response of superpressure balloons to gravity wave motions |
| VerfasserIn |
R. A. Vincent, A. Hertzog |
| 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 ; 7, no. 4 ; Nr. 7, no. 4 (2014-04-23), S.1043-1055 |
| Datensatznummer |
250115699
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| Publikation (Nr.) |
 copernicus.org/amt-7-1043-2014.pdf |
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| Zusammenfassung |
| Superpressure balloons (SPB), which float on constant density
(isopycnic) surfaces, provide a unique way of measuring the
properties of atmospheric gravity waves (GW) as a function of wave
intrinsic frequency. Here we devise a quasi-analytic method of
investigating the SPB response to GW motions. It is shown that the
results agree well with more rigorous numerical simulations of
balloon motions and provide a better understanding of the response
of SPB to GW, especially at high frequencies. The methodology is
applied to ascertain the accuracy of GW studies using 12 m diameter
SPB deployed in the 2010 Concordiasi campaign in the Antarctic. In
comparison with the situation in earlier campaigns, the vertical
displacements of the SPB were measured directly using GPS. It is
shown using a large number of Monte Carlo-type simulations with
realistic instrumental noise that important wave parameters, such as
momentum flux, phase speed and wavelengths, can be retrieved with
good accuracy from SPB observations for intrinsic wave periods
greater than ca. 10 min. The noise floor for momentum flux is
estimated to be ca. 10−4 mPa. |
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