Vertical winds and turbulence over Thumba

Details Vertical winds and turbulence over Thumba Vertical winds and turbulence over Thumba

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..157a&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Feb. 1978, p. 157-159, 161-163. Research supported by the Department of

Physics

7

Artificial Clouds, Atmospheric Turbulence, Turbopause, Vertical Air Currents, Wind Profiles, Atmospheric Circulation, Cloud Dispersal, Gravity Waves, India, Wind Shear

Scientific paper

Features of the barium cloud released over Thumba, India at an altitude of 93 km are reported. The initial cloud form, two rings joined by a knot, was distorted by a north-south wind shear and a vertical wind gradient so that the rings became elongated loops. The upper loop was unaffected by turbulence during the 10 minutes of observation, while 280 sec elapsed before the development of turbulence occurred in the lower loop. This finding could be evidence for the coexistence of turbulent and nonturbulent regions in the 93-95 km altitude range. Vertical velocities for the cloud as well as for other barium clouds released at lower altitudes indicate a profile which suggests the presence of an internal atmospheric gravity wave. The possibility is considered that gradients in the vertical wind could lower the turbopause level, found to be 95 + or - 2 km, about 10 km lower than the level observed earlier.

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