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SUMMARY:Stably stratified and convective atmospheric turbulence: Energy an
 d flux budget analysis - Igor Rogachevskii (Ben-Gurion University)
DTSTART:20240425T150000Z
DTEND:20240425T160000Z
UID:TALK216199@talks.cam.ac.uk
DESCRIPTION:We discuss energy and flux budget (EFB) analysis for stably st
 ratified and convective atmospheric turbulence. The EFB analysis shows tha
 t that high-Reynolds-number stably stratified turbulence is maintained by 
 shear in any stratification\, and the &ldquo\;critical Richardson number\,
 &rdquo\; treated many years as a threshold between the turbulent and lamin
 ar regimes\, actually separates two turbulent regimes\, namely\, the stron
 g turbulence typical of atmospheric boundary layers and the weak three-dim
 ensional turbulence typical of the\nfree atmosphere and characterized by a
  strong decrease in the heat transfer in comparison to the momentum transf
 er. Large-scale internal gravity waves result in additional vertical turbu
 lent flux of momentum and additional productions of the densities of the t
 urbulent kinetic and potential energies and turbulent flux of potential te
 mperature. We also discuss application of the EFB analysis to convective a
 tmospheric turbulence\, which allows to describe the surface layer (unstab
 ly stratified and dominated by\nsmall-scale turbulence of very complex nat
 ure) as well as the convective boundary layer core (dominated by the energ
 y-\, momentum-\, and mass-transport of semi-organized large-scale structur
 es with a small contribution from small-scale turbulence produced by local
  structural shears).
LOCATION:Seminar Room 1\, Newton Institute
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