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| Titel |
Characteristics of gravity waves generated in a convective and a non-convective environment revealed from hourly radiosonde observation under CPEA-II campaign |
| VerfasserIn |
S. K. Dhaka, R. Bhatnagar, Y. Shibagaki, H. Hashiguchi, S. Fukao, T. Kozu, V. Panwar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 12 ; Nr. 29, no. 12 (2011-12-16), S.2259-2276 |
| Datensatznummer |
250017144
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| Publikation (Nr.) |
 copernicus.org/angeo-29-2259-2011.pdf |
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| Zusammenfassung |
| Analyses of hourly radiosonde data of temperature, wind, and relative
humidity during four days (two with convection and two with no convection)
as a part of an intensive observation period in CPEA-2 campaign over Koto
Tabang (100.32° E, 0.20° S), Indonesia, are presented.
Characteristics of gravity waves in terms of dominant wave frequencies at
different heights and their vertical wavelengths are shown in the lower
stratosphere during a convective and non-convective period. Gravity waves with
periods ~10 h and ~4–5 h were found dominant near
tropopause (a region of high stability) on all days of
observation. Vertical propagation of gravity waves were seen modified near
heights of the three identified strong wind shears (at ~16, 20, and
25 km heights) due to wave-mean flow interaction. Between 17 and 21 km
heights, meridional wind fluctuations dominated over zonal wind, whereas from
22 to 30 km heights, wave fluctuations with periods ~3–5 h and
~8–10 h in zonal wind and temperature were highly associated,
suggesting zonal orientation of wave propagation. Gravity waves from
tropopause region to 30 km heights were analyzed. In general, vertical
wavelength of 2–5 km dominated in all the mean-removed (~ weekly mean)
wind and temperature hourly profiles. Computed vertical wavelength spectra
are similar, in most of the cases, to the source spectra (1–16 km height)
except that of zonal wind spectra, which is broad during active convection.
Interestingly, during and after convection, gravity waves with short
vertical wavelength (~2 km) and short period (~2–3 h)
emerged, which were confined in the close vicinity of tropopause, and were
not identified on non-convective days, suggesting convection to be the source
for them. Some wave features near strong wind shear (at 25 km height) were
also observed with short vertical wavelengths in both convective and
non-convective days, suggesting wind shear to be the sole cause of generation
and seemingly not associated with deep convection below. A drop in the
temperature up to ~4–5 K (after removal of diurnal component) was
observed at ~16 km height near a strong wind shear (~45–55 m s−1 km−1) during active period of convection. |
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