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| Titel |
Reconstruction of internal gravity wave parameters from radio occultation retrievals of vertical temperature profiles in the Earth's atmosphere |
| VerfasserIn |
V. N. Gubenko, A. G. Pavelyev, R. R. Salimzyanov, A. A. Pavelyev |
| 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. 10 ; Nr. 4, no. 10 (2011-10-14), S.2153-2162 |
| Datensatznummer |
250002115
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| Publikation (Nr.) |
 copernicus.org/amt-4-2153-2011.pdf |
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| Zusammenfassung |
| A new method for the reconstruction of internal gravity wave (IGW)
parameters from a single vertical temperature profile measurement in the
Earth's atmosphere has been developed. This method does not require any
additional information not contained in the profile and may be used for the
analysis of profiles measured by various techniques. The criterion for the
IGW identification has been formulated and argued. In the case when this
criterion is satisfied, then analyzed temperature fluctuations can be
considered as wave-induced. The method is based on the analysis of relative
amplitude thresholds of the temperature wave field and on the linear IGW
saturation theory in which amplitude thresholds are restricted by dynamical
(shear) instability processes in the atmosphere. When the amplitude of an
internal gravity wave reaches the shear instability limit, energy is assumed
to be dissipated in such a way that the amplitude is maintained at the
instability limit as the wave propagates upwards. In order to approbate the
method we have used data of simultaneous high-resolution balloon
measurements of the temperature and wind velocity in the Earth's
stratosphere over France where a long-period inertia-gravity wave has been
detected. Using the radiosonde temperature data only, we have reconstructed
all wave parameters, which were determined by radiosondes, with relative
deviations not larger than 30%. An application of the method to the radio
occultation (RO) data has given the possibility to identify the IGWs in the
Earth's stratosphere and to determine the magnitudes of key wave parameters
such as the intrinsic frequency, amplitudes of vertical and horizontal
perturbations of the wind velocity, vertical and horizontal wavelengths,
intrinsic vertical and horizontal phase (and group) speeds, kinetic and
potential energy, vertical fluxes of the wave energy and horizontal
momentum. The obtained results of internal wave studies in the Earth's
stratosphere deduced from the COSMIC and CHAMP GPS occultation temperature
profiles are presented and discussed. |
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