[PEM18-P12] Observational evaluation of temperature/wind perturbations associated with small-scale AGWs : Parameterisation and validation of wave structures
Keywords:atmospheric gravity waves, lidar observation
In this study, we tried to identify small-scale (less than 100 km) and short-period (less than 1 h) gravity waves by using the Tromsoe Na lidar. Gravity waves contribute significantly to the wind field and thermal balance in the mesosphere and lower thermosphere (MLT) region because they vertically transport horizontal momentum from the lower atmosphere. It is also pointed that, in particular, smaller-scale and shorter-period waves tend to transport larger momentum. Small-scale gravity waves in the MLT region are mainly studied with airglow imaging measurements. The airglow measurements, however, cannot observe temperature and wind perturbations directly, which are necessary for the estimation of wave’s momentum flux. Based on temperature and wind perturbations with the five-direction lidar, we evaluate dynamical effect of small-scale gravity waves propagating in the upper atmosphere quantitatively.
In this presentation, we will report some initial results derived from simultaneous measurements of the lidar and airglow imaging in 2013-2016.