Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jastp..63.1585s&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 63, Issue 15, p. 1585-1592.
Physics
Scientific paper
The paper describes a case study on travelling wave disturbance observed in the Atmospheric Boundary Layer (ABL) during a thunderstorm which took place on 27 April 1995 at the west coast of India. The upper air synoptic wind charts at 0.3 and 0.6km above MSL obtained for the day from India Meteorological Department (IMD) show presence of cyclonic circulations over Trivandrum (/8°33'N, /76°57'E). A rainfall of 4mm is reported by IMD northeast of Trivandrum coast associated with thunderstorm. The study is based on the data analyses of wind components /(u,v,w), temperature, humidity and pressure obtained simultaneously from two towers separated by a distance of 5.5km, one 0.5km and the other at 6km inland from the coast. The event is detected first at the inland site by a sudden surge in surface wind speed (~6m/s), downdraft of 1m/s with associated rise in temperature by 4-/5°C at 1600h followed by oscillations in wind components of 1h period. At the coastal site pressure jump of about 1mb and 1h period oscillations in pressure and wind components are observed after about 30min from the inland site. The wind component data from the two towers have been subjected to cross-correlation and spectral analyses. They show wave period of 1h and wave travelling westward (from land to seaward) with a trace speed of ~20m/s. The trace speed arrived from pressure and wind surge is also of the same magnitude. The frequency weighted spectra of wind components show 1h period at the low-frequency side (wave active region) and /-2/3 slope at the high-frequency side representing inertial subrange of Kolmogorov spectrum of turbulence. Microscale turbulence generated during nighttime is thought to be through the process of deriving energy from the wave motion.
Sen Gupta K.
Sunil T.
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