Abstract
A combination of methods originating from non-stationary time-series analysis is applied to two datasets of near-surface turbulence in order to gain insights on the non-stationary enhancement mechanism of intermittent turbulence in the stable atmospheric boundary layer (SBL). We identify regimes of SBL turbulence for which the range of time scales of turbulence and submeso motions, and hence their scale separation (or lack of separation), differs. Ubiquitous flow structures, or events, are extracted from the turbulence data in each flow regime. We relate flow regimes characterized by very stable stratification, but differing in the dynamical interactions and in the transport properties of different scales of motion, to a signature of flow structures thought to be submeso motions.
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Acknowledgements
The authors thank Marc Parlange and the EFLUM laboratory at EPFL for providing the SnoHATS data and Larry Mahrt for providing the FLOSSII data and help to analyze them. Illia Horenko and Dimitri Igdalov provided the FEM-BV-VARX framework and help that was greatly appreciated. Alexander Kuhn is greatly acknowledged for his software provided to visualise flow structures. The research was funded by the Deutsche Forschungsgemeinschaft (DFG) through grant number VE 933/2-1 “Towards Stochastic Modelling of Turbulence in the Stable Atmospheric Boundary Layer”, and has been partially supported by the DFG through the CRC 1114 “Scaling Cascades in Complex Systems”, Project (B07) “Selfsimilar structures in turbulent flows and the construction of LES closures”.
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Vercauteren, N., Boyko, V., Kaiser, A. et al. Statistical Investigation of Flow Structures in Different Regimes of the Stable Boundary Layer. Boundary-Layer Meteorol 173, 143–164 (2019). https://doi.org/10.1007/s10546-019-00464-1
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DOI: https://doi.org/10.1007/s10546-019-00464-1