Kinematic flux

From Glossary of Meteorology



kinematic flux

Transport of a variable per unit area per unit time (i.e., a dynamic flux), but divided by the average air density (or in the case of heat flux, divided by the product of air density times specific heat of air at constant pressure).

The resulting kinematic flux has the same units as velocity times the variable being transported. For example, a vertical turbulent heat flux is
ams2001glos-Kex03
, while a vertical heat flux associated with mean wind is
ams2001glos-Kex04
, where w is vertical velocity, θ is potential temperature, an overbar denotes an average, and a prime denotes a deviation from the average. Kinematic fluxes are more closely related to meteorological variables that can be easily measured (such as temperature and wind) than are the associated dynamic fluxes (such as J m-2s-1). Statistically, kinematic fluxes are covariances.


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.