SPECTRA OF GRAVITY-WAVE DENSITY AND WIND PERTURBATIONS OBSERVED DURING ARCTIC NOCTILUCENT CLOUD (ANLC-93) CAMPAIGN OVER THE CANADIAN PRAIRIES - SYNERGISTIC AIRBORNE NA LIDAR AND MF RADAR OBSERVATIONS

The airborne Na lidar and the Saskatoon and Canadian Network for Space Research (CNSR) medium frequency (MF) radars were used to measure the spectra of: gravity wave density and wind perturbations during the Ar ctic Noctilucent Cloud (ANLC-93) campaign. The National Center for Atm ospheric Research Electra flight between Sylvan Lake, Saskatoon, and G reat Falls occurred on August 12, 1993. This provided vertical and hor izontal wave number spectra for relative atmospheric density fluctuati ons along the flight legs. Slopes are -2.5+/-0.1 and -1.3+/-0.1, respe ctively, for the vertical and one-dimensional horizontal wave number s pectra. The radars provided temporal frequency and vertical wave numbe r spectra for the flight mission day and duration (July 15 to August 1 5) of the campaign, so that the fluxes on August 12 could be related t o typical summer values. The slopes of frequency spectra are typically -2.1 (1-6 hours) and -1.0 (10-100 min). Gravity wave (GW) parameters from the two observation systems are compared on August 12, including horizontal anisotropies, and dominant horizontal and vertical scale si zes. In particular, several new analyses are developed to illustrate t he synergy that is possible between such systems. The radar winds data , using variance: ovals and a new correlation-vector technique, provid e evidence for GW propagation into the NE quadrant. This anisotropy of GW propagation is also shown to be evident in the lidar data. An inno vative analysis is applied to the Saskatoon MF radar, using Doppler an d angle-of-arrival data, and used to characterize a unique GW event, w hich is also observed spatially by the lidar when close to Saskatoon.