Thin aerosol clouds at tropopause level

Aerosol clouds about 2 km below the tropopause are studied using the data from lidar and MST radar at Gadanki. The cloud shows fluctuations with time scales as short as 1/2 h in the backscatter ratio. Depolarization factor indicates ice crystal formation when the cloud is strong. The MST radar wind data show strong turbulence below the cloud level indicating, probably, turbulent mixing/transport of water vapor from lower heights to cloud heights facilitating cloud formation

Preliminary results of equatorial wave experiment conducted from 18 Jan. 1999 to 5 Mar. 1999 with lidar at Gadanki

231-234An experimental campaign has been conducted from 18 Jan. to 5 Mar. 1999 at Gadanki using MST radar and lidar to delineate the characteristics of equatorial waves. In this paper, the preliminary results from lidar data on temperature in the upper troposphere and mesosphere are presented. The characteristics of equatorial waves with periods in the range 9.4 days- 2.6 days in temperature are delineated

Thin aerosol clouds at tropopause level

245-248Aerosol clouds about 2 km below the tropopause are studied using the data from lidar and MST radar at Gadanki. The cloud shows fluctuations with time scales as short as 1/2 h in the backscatter ratio. Depolarization factor indicates ice crystal formation when the cloud is strong. The MST radar wind data show strong turbulence below the cloud level indicating, probably, turbulent mixing /transport of water vapour from lower heights to cloud heights facilitating cloud formation