Doppler SODAR observations of the temperature structure parameter during monsoon season over a tropical rural station,Gadanki |
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Authors: | M SHRAVAN KUMAR V K ANANDAN AMIT KESARKAR P NARASIMHA REDDY |
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Institution: | (1) Karlsruhe Institute of Technology, Institute for Meteorology and Climate Research – Atmospheric Environmental Research (IMK-IFU), Garmisch-Partenkirchen, Germany |
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Abstract: | Doppler SODAR (Sound Detection and Ranging) measurements over a tropical Indian station at National Atmospheric Research Laboratory
(NARL), Gadanki (13.5°N, 79.2°E) during two consecutive monsoon seasons, 2007 and 2008, are investigated to study the influence
of mechanically generated turbulence on temperature structure parameter (CT2)_{\rm T}^{2}) in the convective boundary layer. Increase in the CT2_{\rm T}^{2} is observed after the arrival of monsoon for both seasons. Contribution of vertical wind shear in horizontal wind component
to CT2_{\rm T}^{2} due to zonal winds is responsible for the increase observed in the temperature structure parameter which is inferred from
the results obtained. CT2_{\rm T}^{2} is found to be increased by an order of 2 in both the lower and upper altitudes, respectively. Magnitude of wind speed is
reported to be doubled with the arrival of monsoon. It is also observed that, southwest monsoon wind modulates the day-to-day
variations of wind pattern over this station during the onset phase of monsoon season. The lower variability observed at lower
height is attributed to the complex topography surrounding this region. |
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