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| Titel |
Wind profiler observations of a monsoon low-level jet over a tropical Indian station |
| VerfasserIn |
M. C. R. Kalapureddy, D. N. Rao, A. R. Jain, Y. Ohno |
| 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 ; 25, no. 10 ; Nr. 25, no. 10 (2007-11-06), S.2125-2137 |
| Datensatznummer |
250015927
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2125-2007.pdf |
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| Zusammenfassung |
| Three-year high-resolution wind observations of the wind profiler have been
utilized to characterize the diurnal and seasonal features of the monsoon
Low-Level Jet (LLJ) over a tropical station, Gadanki (13.5° N, 79.2° E),
with a focus on the diurnal variability of low-level winds. The Boreal
summer monsoon winds show a conspicuously strong westerly LLJ with average
wind speed exceeding 20 m s−1. The L-band wind profiler measurements
have shown an advantage of better height and time resolutions over
the conventional radiosonde method for diurnal wind measurements. An interesting
diurnal oscillation of LLJ core has been observed. It is varying in the height
range of 1.8±0.6 km with the maximum and minimum intensity noticed
during the early morning and afternoon hours, respectively. The jet core (wind
maxima) height is observed to coincide with the inversion height. Strong wind
shears are normally located beneath the LLJ core. The sole wind profiler
observations are capable of identifying the monsoon phases, such as onset,
break and active spells, etc. The mutual influence between the LLJ and the
boundary layer has been discussed. One notices that the observed LLJ diurnal
structures depend on the local convective activity, wind shears and
turbulence activity associated with boundary layer winds. The day-to-day
change in the LLJ structure depends on the latitudinal position of the LLJ
core. |
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