Campus Units

Geological and Atmospheric Sciences, Agronomy, Aerospace Engineering, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

3-1999

Journal or Book Title

Monthly Weather Review

Volume

127

Issue

3

First Page

308

Last Page

321

DOI

10.1175/1520-0493(1999)127<0308:LSORCA>2.0.CO;2

Abstract

Regional climate simulations are long time integrations over an open system where the atmosphere over part of the model domain (boundary zones) is updated periodically. Model reinitialization after a long period of integration can allow several segments of a long simulation to be run in parallel and also minimize possible drift caused by accumulated model errors. However, the spinup problems introduced by each additional restart must be addressed. The necessity and feasibility of subdividing long integrations is investigated by means of a series of experiments in which the authors examine the effects of reinitialization frequency and the relative importance of surface forcing and atmospheric forcing. It is found that for integrations that continued without reinitialization, locations of specific meteorological features drifted downstream because simulated winds were too strong, implying the need for periodic reinitialization of the model. The results indicate also that when the model reinitialization interval is relatively long, simulated domain-averaged variables, including rainfall, were not very sensitive to model reinitialization since they are largely constrained by transient boundary conditions, suggesting the feasibility of dividing long regional climate simulations into a set of shorter ones that could be run in parallel.

Comments

This article is published as Pan, Zaitao, Eugene Takle, William Gutowski, and Richard Turner. "Long simulation of regional climate as a sequence of short segments." Monthly weather review 127, no. 3 (1999): 308-321. DOI:10.1175/1520-0493(1999)127<0308:LSORCA>2.0.CO;2. Posted with permission.

Rights

Copyright 1999 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act September 2010 Page 2 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the 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, requires written permission or a license from the AMS. All AMS journals and monograph publications are registered with the Copyright Clearance Center (http://www.copyright.com). Questions about permission to use materials for which AMS holds the copyright can also be directed to the AMS Permissions Officer at permissions@ametsoc.org. Additional details are provided in the AMS Copyright Policy statement, available on the AMS website (http://www.ametsoc.org/CopyrightInformation).

Copyright Owner

American Meteorological Society

Language

en

File Format

application/pdf

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