Summary
The ANGWIN Antarctic Gravity Wave Instrument Network has the ability to measure gravity-wave characteristics at various locations and height ranges. An ANGWIN objective is to make comparisons to the parameterized gravity waves in climate models with a view to improving their performance; a significant modelled temperature bias exists in the southern polar winter stratosphere due to a lack of gravity-wave forcing, with consequences for studies of the ozone layer and southern hemisphere climate. The success of model-observation comparisons depends on both the way gravity waves are observed and the design of model GW representations. The non-orographic wave parameterization in the Whole Atmosphere Community Climate Model (WACCM) identifies convective and frontal sources and launches waves from them. Although this puts it at the forefront of GW parameterizations, the wave sources use a phase speed spectrum that is hard to span in observations. As such, it remains difficult to use observations to improve the parameterization. A Quasi-Monochromatic GW based parameterization scheme is under development for the WACCM frontal gravity-wave scheme. Source waves are fully described in terms of measurable GW parameters and can have a log-normal momentum flux amplitude distribution. Saturation thresholds depend on the vertical wavenumber and intrinsic frequency over their full range (using Warner McIntyre 1996 theory) and these GW parameters are tracked through the vertical column. In addition, secondary GW generation is being added. This presentation describes the changes being made to the WACCM GWDP scheme, their motivation and their advantages. Preliminary results and touch points with observations are discussed.