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RISBaroclinic Instability and Wave-Wave Interactions in Quasi-geostrophic Error Growth
Publisher: American Meteorological Society
Abstract: A two-level quasi-geostrophic beta-plane channel model with a smooth lower surface is used to study the dynamics of the growth of errors, with particular attention paid to the roles of wave-wave interactions via-a-vis those ...
The Midlatitude Development of Regional Errors in a Global GCM
Publisher: American Meteorological Society
Abstract: The growth of geographically confined errors is studied in six experiments with a five-level global spectral (rhomboidal 30) general circulation model. Each experiment consists of 36 identical twin integrations with the ...
Long-Wave Baroclinic Instability in the Troposphere and Stratosphere with Spherical Geometry
Publisher: American Meteorological Society
Abstract: The most unstable normal modes have been obtained for a global model of the atmosphere which extends from the ground to 70 km. The model is quasi-geostrophic and in spectral form, including wavenumbers 1?6. Two sets of ...
Synoptic-Eddy Feedbacks and Circulation Regime Analysis
Publisher: American Meteorological Society
Abstract: A method to incorporate synoptic eddies into the diagnosis of circulation regimes using cluster analysis is illustrated using boreal winter reanalyses of the National Centers of Environmental Prediction (hereafter observations) ...
On the Role of the Seasonal Cycle
Publisher: American Meteorological Society
Abstract: The seasonal cycle is defined as the projection of an atmospheric time series onto a suitably defined subset of orthogonal basis functions, the choice of which depends on the length of the series involved. This procedure ...
Variations of Midlatitude Transient Dynamics Associated with ENSO
Publisher: American Meteorological Society
Abstract: The winter response of the atmosphere to El Niño events in the Pacific is studied both from a 14-year integration of the Center for Ocean?Land?Atmosphere GCM using observed SSTs from January 1979 to February 1993 and from ...
Tropical Stationary Wave Response to ENSO: Diabatic Heating Influence on the Indian Summer Monsoon
Publisher: American Meteorological Society
Abstract: he atmospheric response to boreal summer tropical diabatic heating is studied in the atmospheric model component of the Community Atmosphere Model [CAM, version 3 (CAM3)] of the National Center for Atmospheric Research. ...
Interactions of Synoptic and Planetary Waves: Scale-Dependent Forcing of a GCM
Publisher: American Meteorological Society
Abstract: In order to better understand planetary wave?synoptic wave interactions in the atmosphere, and to develop a tool for further studies, the authors have applied a wavenumber-dependent external forcing to a general circulation ...
Vertical Structure and Dominant Horizontal Scales of Baroclinic Waves in the NASA DAO and NCEP Reanalyses
Publisher: American Meteorological Society
Abstract: The reanalyses of the Data Assimilation Office (DAO) of the National Aeronautics and Space Administration (NASA) are compared to those of the National Centers for Environmental Prediction (NCEP) with regard to the vertical ...
Statistical–Dynamical Seasonal Prediction Based on Principal Component Regression of GCM Ensemble Integrations
Publisher: American Meteorological Society
Abstract: A statistical approach to correct a dynamical ensemble forecast of future seasonal means based on the past performance of a general circulation model (GCM) is formulated. The approach combines principal component (PC) ...