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| Titel |
VHF radar observation of atmospheric winds, associated shears and C2n at a tropical location: interdependence and seasonal pattern |
| VerfasserIn |
A. K. Ghosh, V. Siva Kumar, K. Kishore Kumar, A. R. Jain |
| 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 ; 19, no. 8 ; Nr. 19, no. 8, S.965-973 |
| Datensatznummer |
250014307
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| Publikation (Nr.) |
 copernicus.org/angeo-19-965-2001.pdf |
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| Zusammenfassung |
The turbulence
refractivity structure constant (C2n ) is an important
parameter of the atmosphere. VHF radars have been used extensively for the
measurements of C2n. Presently, most of such observations
are from mid and high latitudes and only very limited observations are
available for equatorial and tropical latitudes. Indian MST radar is an
excellent tool for making high-resolution measurements of atmospheric winds,
associated shears and turbulence refractivity structure constant (C2n).
This radar is located at Gadanki (13.45° N, 79.18° E), a tropical station in
India. The objective of this paper is to bring out the height structure of C2n
for different seasons using the long series of data (September 1995 – August
1999) from Indian MST radar. An attempt is also made to understand such changes
in the height structure of C2n in relation to background
atmospheric parameters such as horizontal winds and associated shears. The
height structure of C2n, during the summer monsoon and
post-monsoon season, shows specific height features that are found to be
related to Tropical Easterly Jet (TEJ) winds. It is important to examine the
nature of the radar back-scatterers and also to understand the causative
mechanism of such scatterers. Aspect sensitivity of the received radar echo is
examined for this purpose. It is observed that radar back-scatterers at the
upper tropospheric and lower stratospheric heights are more anisotropic, with
horizontal correlation length of 10–20 m, as compared to those observed at
lower and middle tropospheric heights.
Key words. Meteorology and
atmospheric dynamics (climatology; tropical meteorology; turbulence) |
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