The Multi-Scale Dynamics of Gravity Waves in Parameterizations: Central Issues and Solution Strategies
Monday, 14 December 2015: 08:15
2016 (Moscone West)
A major source of uncertainty in current climate-chemistry models are internal gravity waves (GWs), represented by oversimplified parameterizations. A new German/Swiss research unit on the multiscale dynamics of GWs (MS-GWaves, https://ms-gwaves.iau.uni-frankfurt.de/index.php) is to formulate explicit models of GW excitation, propagation, and dissipation in a physically and mathematically consistent way. Both process-resolving numerical modeling and measurement campaigns will be critical in validating the approaches and improving them further. The improved GW parameterizations will be implemented into and tested in a global non-hydrostatic numerical weather-forecast model (ICON) that can locally resolve a major part of the GW spectrum. The presentation will discuss central questions addressed, and some early results. One focus will be on the modelling of the numerically stable two-way interaction between subgrid-scale GWs and the resolved flow. This will be extended depending on recent developments, e.g. with regard to spontaneous imbalance or the GW-tropopause interaction.