Second-order closure

From Glossary of Meteorology



second-order closure

A type of higher-order turbulence closure in which prognostic equations are retained for mean variables (such as potential temperature and wind), as well as for some of the higher-order statistics, including variance (such as turbulence kinetic energy or temperature variance) and covariance (kinematic fluxes such as for heat and momentum).

Any third- and higher-moment statistics remaining in the equations are approximated as functions of lower-order statistics and independent variables.
Compare first-order closure, K-theory, one-and-a-half order closure, nonlocal closure, closure assumptions.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. 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.