Turbulence and Diffusion

The impact of micro-scale turbulence on the dynamics can be described in the statistical mean as an effective diffusivity. The statistical behavior of large-scale waves can be described as macro-turbulence. Both concepts need to be considered for a correct treatment of resolved and unresolved scales in numerical simulations.

Methods

For the topic, circulation models with parameterized turbulence were used (ICON-IAP and KMCM), partly coupled with a chemistry model (MECTM). Theoretical contributions on this subject were devoted to the problem of wave-induced mixing and turbulent closure at different scales.

Recent publications

  • Schaefer-Rolffs, U., 2018: A comparison of different solutions for the Dynamic Smagorinsky Model applied in a GCM. Meteorol. Z. 27,  3: 249-261, doi:10.1127/metz/2018/0885.
  • Schaefer-Rolffs, U., 2019: The scale invariance criterion for geophysical fluids. Eur. Phys. J. B 74: 92-98, doi:10.1016/j.euromechflu.2018.11.005.
  • Schaefer-Rolffs, U. & E. Becker, 2018: Scale-Invariant Formulation of Momentum Diffusion for High-Resolution Atmospheric Circulation Models. Mon. Wea. Rev. 146,  4: 1045-1062, doi:10.1175/mwr-d-17-0216.1.
  • Strelnikov, B., M. Eberhart, M. Friedrich, J. Hedin, M. Khaplanov, G. Baumgarten, B. P. Williams, T. Staszak, H. Asmus, I. Strelnikova, R. Latteck, M. Grygalashvyly, F.-J. Lübken, J. Höffner, R. Wörl, J. Gumbel, S. Löhle, S. Fasoulas, M. Rapp, A. Barjatya, M. J. Taylor & P.-D. Pautet, 2019: Simultaneous in situ measurements of small-scale structures in neutral, plasma, and atomic oxygen densities during the WADIS sounding rocket project. Atmos. Chem. Phys. 19,  17: 11443-11460, doi:10.5194/acp-19-11443-2019.
  • Vierinen, J., J. L. Chau, H. Charuvil, J. M. Urco, M. Clahsen, V. Avsarkisov, R. Marino & R. Volz, 2019: Observing Mesospheric Turbulence With Specular Meteor Radars: A Novel Method for Estimating Second‐Order Statistics of Wind Velocity. Earth Space Sci. 6,  7: 1171-1195, doi:10.1029/2019ea000570.

Staff

  • Erich Becker
  • Victor Avsarkisov
  • Almut Gaßmann
  • Mikhailo Grygalashvyly
  • Urs Schaefer-Rolffs