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| Titel |
Seasonal, annual and inter-annual features of turbulence parameters over the tropical station Pune (18°32' N, 73°51' E) observed with UHF wind profiler |
| VerfasserIn |
Narendra Singh, R. R. Joshi, H.-Y. Chun, G. B. Pant, S. H. Damle, R. D. Vashishtha |
| 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 ; 26, no. 12 ; Nr. 26, no. 12 (2008-11-24), S.3677-3692 |
| Datensatznummer |
250016301
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3677-2008.pdf |
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| Zusammenfassung |
| The present study is specifically focused on the seasonal, annual and
inter-annual variations of the refractive index structure parameter (Cn2)
using three years of radar observations. Energy dissipation rates
(ε) during different seasons for a particular year are also
computed over a tropical station, Pune. Doppler spectral width measurements
made by the Wind Profiler, under various atmospheric conditions, are
utilized to estimate the turbulence parameters. The refractive index
structure parameter varies from 10−17.5 to 10−13 m−2/3 under
clear air to precipitation conditions in the height region of 1.05 to 10.35 km.
During the monsoon months, observed Cn2 values are up to 1–2 orders
of magnitude higher than those during pre-monsoon and post-monsoon seasons.
Spectral width correction for various non-turbulent spectral broadenings
such as beam broadening and shear broadening are made in the observed
spectral width for reliable estimation of ε under
non-precipitating conditions. It is found that in the lower tropospheric
height region, values of ε are in the range of 10−6 to
10−3 m2 s−3. In summer and monsoon seasons the observed
values of ε are larger than those in post-monsoon and winter
seasons in the lower troposphere. A comparison of Cn2 observed with the
wind profiler and that estimated using Radio Sonde/Radio Wind (RS/RW) data
of nearby Met station Chikalthana has been made for the month of July 2003. |
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