Breeding method

From Glossary of Meteorology
Revision as of 16:35, 26 January 2012 by imported>Perlwikibot (Created page with " {{TermHeader}} {{TermSearch}} <div class="termentry"> <div class="term"> == breeding method == </div> <div class="definition"><div class="short_definition">A method of...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

breeding method

A method of generating balanced, fast-growing perturbations to a nonlinear model trajectory for a given finite perturbation amplitude.

The technique consists of generating a control run of a nonlinear model for a short period of time (e.g., 6 h), then perturbing the atmospheric initial conditions and running the same model again for the same period of time (perturbed run). The difference between the two model runs at the final time is adjusted to the amplitude of the initial perturbation and is added to the new control initial condition. The method is then repeated. After a few days of iteration, the difference between the control and perturbed model runs represents a sample of fast-growing nonlinear perturbations. Multiple breeding cycles, started with different arbitrary initial perturbations, provide a broader sample of fast-growing perturbations. The technique can also be applied to a series of atmospheric analysis fields, where the control forecast always starts from the latest available analysis.
See bred vectors.

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