In this talk, my focus will be mainly on the atmospheric waves and mesoscale dynamics with special emphasis on surrounding deep convection, Himalayan Mountains, and the jet streams. The properties of atmospheric waves, their sources and their many effects in the atmosphere are studied using the various observational techniques includes Satellite remote sensing (AIRS, CALIPSO, MLS), balloon-borne radiosonde observations along with global model reanalysis data sets such as ECMWF, NCEP/NCAR, MERRA etc.
The three-dimensional properties of atmospheric gravity waves are important in estimating momentum flux. Also, the parameterization schemes used in the global circulation models (GCMs) are still based on simplifying assumptions and estimates of momentum flux is still rely on models than on measurements. To estimate the gravity wave momentum flux it is required to obtain the simultaneous measurement of horizontal and vertical. Hence, in order to achieve this, we have used some innovative techniques using the advanced space-borne measurements such as Atmospheric Infrared Sounder (AIRS), to image the gravity waves in three dimensions and hence estimated the momentum flux over the Himalayan Mountains.
Further, my recent focus is on the dynamics of heavy rainfall events over the central Himalayan region and will share some preliminary and interesting observations for which the detailed analysis is still under progress. In this context, I will also like to discuss about the predictability of extreme weather over the Uttarakhand and adjoining mountainous regions through the response of the upper tropospheric Rossby waves and synoptic-scale circulations.