Wind profile in the planetary boundary layer during morning hours over a tropical semi-arid station

Abstract

The land surface processes associated with heat and momentum, govern the heating of atmospheric boundary layer (ABL) in the morning hours. In the present study, we investigate the structure of wind in ABL depicted in the morning hours and its role in establishing the heating of ABL. For this purpose, the Radiosonde/Radiowind observations collected during the Land Surface Processes Experiment (LASPEX) over the tropical station Anand, India, have been used. It is observed that ABL wind profiles have been changed from one season to another in the form of wind rotation and prominent low level jet (LLJ) stream. During the monsoon season, LLJ played a significant role in establishing the double mixing line structure and elevated wind-backing layer.