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RISMultiple Flow Regimes in the Northern Hemisphere Winter. Part I: Methodology and Hemispheric Regimes
Publisher: American Meteorological Society
Abstract: Recurrent and persistent flow patterns are identified by examining multivariate probability density functions (PDFs) in the phase space of large-scale atmospheric motions. This idea is pursued systematically here in the ...
Multiple Flow Regimes in the Northern Hemisphere Winter. Part II: Sectorial Regimes and Preferred Transitions
Publisher: American Meteorological Society
Abstract: This paper presents an observational analysis of recurrent flow patterns in the Northern Hemisphere (NH) winter, based on a 37-year series of daily 700-mb height anomalies. Large-scale anomaly patterns that appear repeatedly ...
Multiple Attractors and Chaotic Itinerancy in a Quasigeostrophic Model with Realistic Topography: Implications for Weather Regimes and Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: A detailed analysis of the bifurcation structure of a two-level, quasigeostrophic model is made by a combined use of a continuation algorithm and extensive time integrations. The model is formulated on a sphere with realistic ...
Weather Regimes, Low-Frequency Oscillations, and Principal Patterns of Variability: A Perspective of Extratropical Low-Frequency Variability
Publisher: American Meteorological Society
Abstract: The dynamical basis of extratropical low-frequency variability (LFV) is investigated using a quasigeostrophic model on a sphere with realistic Northern Hemisphere topography. The model is driven by Newtonian relaxation to ...
Parameterization of Tropical Instability Waves and Examination of Their Impact on ENSO Characteristics
Publisher: American Meteorological Society
Abstract: he impact of tropical instability waves (TIWs) on El Niño?Southern Oscillation (ENSO) characteristics is investigated by introducing a new parameterization of TIWs into an atmosphere?ocean general circulation model (AOGCM), ...
A Scale Interaction Study on East Asian Cyclogenesis Using a General Circulation Model Coupled with an Interactively Nested Regional Model
Publisher: American Meteorological Society
Abstract: This study newly developed the interactively nested climate model (INCL) using a general circulation model (GCM) interactively nested with a regional atmospheric model (RAM). One interactive experiment with finer RAM ...
A Comparison of Grid Quality of Optimized Spherical Hexagonal–Pentagonal Geodesic Grids
Publisher: American Meteorological Society
Abstract: Construction and optimization methods of spherical hexagonal?pentagonal geodesic grids are investigated. The objective is to compare grid structures on common ground. The distinction between two types of hexagonal?pentagonal ...
On the Persistence of Decadal SST Anomalies in the North Atlantic
Publisher: American Meteorological Society
Abstract: Historical wintertime sea surface temperature (SST) data show that a sandwich pattern dominates on the decadal timescales in the North Atlantic, at least after the 1970s. The authors investigated how such decadal SST ...
A Relationship between Local Error Growth and Quasi-stationary States: Case Study in the Lorenz System
Publisher: American Meteorological Society
Abstract: Properties of the local predictability in the Lorenz system of three variables are investigated as a first step to develop a dynamical method for the skill prediction in the numerical weather forecasts instead of conventional ...
Impact of the Atmospheric Mean State on Tropical Instability Wave Activity
Publisher: American Meteorological Society
Abstract: he features of simulated tropical instability waves (TIWs) in the Pacific Ocean are compared between atmospheric models of two different resolutions coupled with a uniform oceanic model. Results show that TIWs are more ...