Atmospheric gravity waves derived by simultaneous observations of all-sky imagers, a sodium lidar, and foil chaff in the WAVE2004 campaign in Japan
Abstract
The WAVEs in airglow campaign in 2004 WAVE2004 which aimed to elucidate the formation process of waves in airglow structures from both dynamical and chemical perspectives was conducted using rocket-borne and ground-based instruments in Japan on 17 January 2004 In this experiment we observed a large-scale atmospheric gravity wave AGW which appeared in both the vertical profiles of sodium density obtained by a Na lidar and the horizontal distributions of airglow emission obtained by an all-sky imager ASI The horizontal wavelength horizontal phase velocity period and propagation direction of the AGW were estimated as 673-774 km 107-122 m s 1 75 hours and north-northeastward respectively The vertical wavelength obtained by the Na lidar varied with the altitude Below an altitude of about 88 km the measured vertical wavelength showed good agreement with that calculated from the horizontal wavelength by using the dispersion equation The variation of the vertical wavelength with altitude seemed to depend on the variation of the background wind velocity Several hours before the AGW observation the ageostrophic wind component was enhanced in the tropopause region by a distortion of the jetstream in the southwest portion of Japan We suggest that this event is closely related to the generation of the large-scale AGW observed in WAVE2004 The consistency of the occurrence time the location and the wind velocity in the jetstream strongly support this idea
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36.2968K