Spectral diffusivity

From Glossary of Meteorology
The printable version is no longer supported and may have rendering errors. Please update your browser bookmarks and please use the default browser print function instead.



spectral diffusivity

A form of eddy viscosity or eddy diffusivity that varies with eddy size.

For a spectrum of turbulent eddy sizes there is a spectrum of diffusivities. By integrating over all eddy sizes and diffusivities, the total effect of turbulence can be approximated. This is a form of nonlocal turbulence closure and can be shown to be related to transilient turbulence theory.


Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact [email protected]. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.