Wind profiling features and atmospheric dynamics: A few first observations from ST Radar of Gauhati University

Abstract

The windfeatures in fine spatio-temporal resolutions covering lower troposphere to beyond tropopause, are important inputs for understanding atmospheric dynamics associated with weather and climate. The extraction of information from such features requires complex analysis processes because of involvement of wide dynamical meteorology. Therefore, for study of this type, it is essential to have special atmospheric probing set up along with embedded state of art signal analysis tools, where Stratospheric Tropospheric (ST) Radar proves to be one of the most ideal facility that can provide high resolution wind profiling data covering this defined range. The paper thus attempts to understand the physics and dynamics of the atmosphere associated with complex weather environment of the North East part of India by analyzing wind profiling characters received from the ST Radar, installed at Gauhati University (26 ̊N, 91. ̊ E), that offers wind velocity as detailed as 0.1 m/s (in vertical mode) with altitude resolution of 150 m. Starting with the calibration of Radar derived wind parameters with Radiosonde and satellite observed data; the analysis here is directed to assess the reliability of wind speed and directions obtained from this setup. The special events like precipitation and thunder time modulations of wind components are also presented and possible system physics for development of such situations has been focused.