Identification

Title

Normal modes of atmospheric variability in observations, numerical weather prediction, and climate models

Abstract

MOTIVATION. Normal modes, which we deal with here, are eigensolutions to the linearized primitive equations of the atmosphere. Known as the solutions of the first and second kinds or inertia–gravity (IG) and balanced (Rossby type) oscillations, normal modes have been extensively applied for the initialization of numerical weather prediction (NWP) models in the 1980s to early 1990s. The global horizontal structures of normal modes, known as Hough functions, have been used to study various atmospheric dynamical phenomena in weather and climate. The basic properties of the large-scale circulations in the tropics for both the atmosphere and oceans have been elucidated in terms of normal modes on the equatorial beta plane. In the last decade, global data assimilation and forecasting systems have reached resolutions at which IG waves across many scales have become resolved. Furthermore, a rich spectrum of the equatorially trapped IG and the mixed Rossby–gravity waves, in addition to the equatorial Kelvin and Rossby waves, has been identified in observations.

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document

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http://n2t.net/ark:/85065/d7rb7684

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eng

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geoscientificInformation

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publication

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2016-01-01T00:00:00Z

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2016-06-01T00:00:00Z

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Copyright 2016 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 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.

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OpenSky Support

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UCAR/NCAR - Library

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PO Box 3000

Boulder

80307-3000

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opensky@ucar.edu

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http://opensky.ucar.edu/

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