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      https://www.ias.ac.in/article/fulltext/jess/120/01/0065-0072

    • Keywords

       

      Temperature structure parameter; turbulence; Doppler SODAR; winds and monsoon; atmospheric science; remote sensing and monsoons.

    • 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 (C$^{2}_{T}$) in the convective boundary layer. Increase in the C$^{2}_{T}$ is observed after the arrival of monsoon for both seasons. Contribution of vertical wind shear in horizontal wind component to C$^{2}_{T}$ due to zonal winds is responsible for the increase observed in the temperature structure parameter which is inferred from the results obtained. C$^{2}_{T}$ 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.

    • Author Affiliations

       

      M Shravan Kumar1 V K Anandan2 Amit Kesarkar1 P Narasimha Reddy3

      1. National Atmospheric Research Laboratory, Gadanki 517 112, India.
      2. RDA, ISTRAC, Indian Space Research Organisation, Bangalore 560 058, India.
      3. Department of Physics, Sri Venkateswara University, Tirupati 517 502, India.
    • Dates

       
  • Journal of Earth System Science | News

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