Investigation of Intrinsic Gravity Wave Signatures Using Coordinated Lidar andNightglow Image Measurements

摘要

Simultaneous observations of gravity waves using an Na wind/temperature lidar anda multiwavelength all sky nightglow imager were obtained, for the first time, during the ALOHA-93 campaign. A novel investigation of intrinsic wave parameters has been made by combining measurements of the horizontal wave components imaged in four nightglow emissions (height range about 80 to 100 km) with Na lidar soundings of the honzontal wind field and temperature profiles over the same height interval. The intrinsic periods of several of these waves have been determined and were found to vary considerably with altitude, often resulting in a significant increase over their observed wave periods. It is shown that these two instrumental techniques generally sampled different regions of the gravity wave spectrum: the lidar exhibiting most sensitivity to short vertical wavelength waves (less than about 10 km) while the imager was most responsive to larger vertical wavelength waves. This study illustrates the significant advantages of combining wind temperature lidar and multiwavelength image observations for intrinsic gravity wave measurements.