Lidar Observations of Sierra-Wave Conditions

Abstract

Early in 1967 a series of observations using pulsed ruby lidars were made near Independence, Calif.; the objective was to investigate the value of lidar for studying air motion in the Sierra wave, with special reference to indications of turbulence. Although no intense wave activity occurred, appreciable wave motions were observed, both in what appeared to the eye to be clear air and in air where the particulate matter was sufficiently concentrated as to be visible as clouds. Interruptions in the smooth laminar flow in the clear air were observed, and measurements were made of the length, amplitude and height of waves shown by clouds. With previously existing techniques, only limited observation of such phenomena have been possible. It is thus concluded that lidar observations are of considerable value in studying wave motion, even in the absence of visible clouds. There is also a possibility that lidar could indicate the presence of turbulence by revealing the breakdown of wave motion or the presence of rotors.