Journal article

The generation of near-cloud turbulence in idealized simulations

Dragana Zovko-Rajak, Todd P Lane

Journal of the Atmospheric Sciences | American Meteorological Society | Published : 2014

Abstract

This study explores the generation of turbulence in the upper outflow regions of simulated idealized mesoscale convective systems. The simulated storms are shown to generate parameterized turbulence that occurs significant distances (>100 km) from the main convective regions, in both the clear air surrounding the convection and low simulated reflectivity regions with cloud ice but negligible amounts of graupel and snow. The source of the turbulence is related to Kelvin-Helmholtz instabilities that occur in the shear zones above and below the storm-induced upper-level outflow jet that is centered near the tropopause; the model produces resolved-scale billows within regions of low gradient Ric..

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University of Melbourne Researchers

Grants

Awarded by Australian Research Council


Funding Acknowledgements

We thank three anonymous reviewers for their comments that helped to improve the clarity and quality of the manuscript. We also thank Bob Sharman and Stan Trier for useful discussions. DZR is supported by a Melbourne Research Scholarship and TPL is supported by an Australian Research Council Future Fellowship (FT0990892). Computing facilities were provided by the National Computational Infrastructure (NCI) facility; this work also benefited from computational support provided by the ARC Centre of Excellence for Climate System Science (CE110001028).