CO2 Doppler lidar measurement of wind velocity and relative backscatter associated with the nocturnal boundary layer

摘要

Abstract: Heterodyne CO$-2$/ Doppler lidar measurements ofhorizontal wind velocity from the surface to 11,000feet AGL using the Velocity Azimuth Display (VAD)method were made at Holloman AFB, NM from the end ofJuly through mid-August 1998. These data were enteredreal-time into the space maneuver vehicle descentanalysis program to make flight performance predictionsneeded for test decisions. Daily measurementsencompassed the early morning time period associatedwith the stably-stratified nocturnal boundary layer(NBL). Measurement periods were characterized by growththe decay of wind maxima or jets at differentaltitudes. Strong vertical shears were often observedin conjunction with these wind maxima. Relativebackscatter profiles at the lowest altitudes exhibitedperiodic oscillations on most mornings. Relativebackscatter profiles at the lowest altitudes exhibitedperiodic oscillations on most mornings. The observedNBL wind profiles were poorly represented by the Ekmanmodel. !3