Variations of global gravity waves derived from 14Â years of SABER temperature observations

Since the SABER data cover longer than one solar cycle, multivariate linear regression is applied to calculate the trend (means linear trend from 2002 to 2015) of global GW PE and the responses of global GW PE to solar activity, to QBO (quasi-biennial oscillation) and to ENSO (El Nino-Southern Oscillation).

We find a significant positive trend of GW PE at around 50 degrees N during July from 2002 to 2015, in agreement with ground-based radar observations at a similar latitude but from 1990 to 2010. Both the monthly and the deseasonalized trends of GW PE are significant near 50 degrees S. Specifically, the deseasonalized trend of GW PE has a positive peak of 12-15% per decade at 40 degrees S-50 degrees S and below 60 km, which suggests that eddy diffusion is increasing in some places.