3:42 PM - 3:45 PM
[PEM27-P23] New analysis of gravity wave in middle atmosphere by Rayleigh/Raman lidar at Syowa station in Antarctica
3-min talk in an oral session
Keywords:Stratsphere, Mesosphere, Middle atmosphere, gravity wave, Antarctica, Lidar
We have analyzed the lidar data based on Duck et al. (2001) and Alexander et al. (2011). However, their analysis has a problem. They estimated gravity waves’ temperature amplitude to be the value (T′) that is difference between background temperature and atmospheric temperature. Their analysis may underestimate the potential energy (Ep) due to not consider the phase. To solve the above problem, we calculated the value (Th′) delaying 90 degree from T′ phase to perform Hilbert transformation on T′ weighted by the square root of density, and defined gravity waves’ temperature amplitude as ((T′)2+(Th′)2)1/2. In this presentation, our analysis will be explained in detail.