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Coarsegraining as a technique to reveal subgrid scale fluxes and test the diffusive assumption.
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Title  Coarsegraining as a technique to reveal subgrid scale fluxes and test the diffusive assumption. 
Title of Series  Leibniz MMS Days 2019 
Author 
Sommerfeld, Bastian

License 
CC Attribution 3.0 Germany: You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor. 
DOI  10.5446/40501 
Publisher  WeierstraßInstitut für Angewandte Analysis und Stochastik (WIAS), LeibnizInstitut für Atmosphärenphysik (IAP) 
Release Date  2019 
Language  English 
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Subject Area  Mathematics 
Abstract  The limits of model resolution in atmospheric and oceanographic modeling necessitate the use of subgrid parametrizations to account for unresolved processes. The goto approach is using diffusive parametrizations such as the Dynamical Smagorinsky. In this work use a CoarseGraining technique to reveal subgrid scale dynamics to test whether or not they do behave according to the diffusive assumption. We find a highly organized and structured turbulent shear production, which leads us to question the underlying assumptions and limits of diffusive parametrizations. 
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