Studies of atmospheric boundary layer of Delhi using acoustic sounders at two locations

Abstract

Two low power monostatic sodar systems have been operated simultaneously at two slightly different topographical locations 10 km distance apart during January to March 1986 to study the atmospheric boundary layer of Delhi. The Information is considered useful In modeling hazardous air pollution situations and studying mesoscale dynamics. The sounding data were supplemented by meteorological observations of surface wind velocity and temperature the data have exhibited characteristic features common to both the sounders of the using nocturnal Universal. On layer, daytime convective thermal plumes, fiat, short and tall spiky top surface based nocturnal Inversion structures and turbulent stratified, elevated and wavy structures. A few differences In the detailed study of these features, viz., In the heights of these structures and In the time of their occurrence at two sites have also been noticed: The observed differences in the characteristics at the two sites have been attributed to the topography and Intervening meso-scale flow.