The Multi-Scale Dynamics of Gravity Waves in Parameterizations: Central Issues and Solution Strategies

Monday, 14 December 2015: 08:15
2016 (Moscone West)
Ulrich Achatz1, Erich Becker2, Jorge L. Chau2, Andreas Doernbrack3, Uwe Harlander4, Illia Horenko5, Rupert Klein6, Franz-Josef Luebken2, Elisa Manzini7, Peter Preusse8, Markus Rapp9, Hauke Schmidt7, Peter Spichtinger10, Günther Zängl11, Christoph Zuelicke2 and MS-GWaves, (1)Goethe University Frankfurt, Frankfurt, Germany, (2)Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany, (3)German Aerospace Center DLR Cologne, Cologne, Germany, (4)University BTU-Cottbus, Cottbus, Germany, (5)Universita della Svizzera Italiana, Lugano, Switzerland, (6)Free University of Berlin, Berlin, Germany, (7)Max Planck Institute for Meteorology, Hamburg, Germany, (8)Forschungszentrum Jülich, Jülich, Germany, (9)German Aerospace Center (DLR), Institute of Atmospheric Physics, Wessling, Germany, (10)University of Mainz, Mainz, Germany, (11)Deutscher Wetterdienst (DWD), Offenbach am Main, Germany
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, 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.