EOF and SVD Analyses of the Low-Frequency Variability of the Barotropic Component of the Atmosphere

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概要

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• In this study, we have investigated the dominant horizontal patterns of the barotropic component of the atmosphere, the external forcing to it, and the nonlinear scale interactions, using the EOF and SVD analyses for 50 years of DJF mean NCEP/NCAR reanalysis. According to the EOF analysis, the horizontal pattern of the EOF-1 of the atmosphere represents the Arctic Oscillation (AO), and the EOF-2 represents the PNA teleconnection pattern. The SVD-1 for the barotropic component and the external forcing represents the structure of AO with the external forcing characterized by topographic forcing. The energy balance for the SVD patterns, however, shows that the external forcing of the SVD-1 damps the AO-like anomaly of the barotropic component. The SVD-2 represents the PNA, and the time series of the coefficient indicates a link with El Nino/La Nina. The external forcing of the SVD-2 appears also to damp the PNA-like anomaly. Furthermore, the SVD-1 for the barotropic component and the nonlinear scale interactions represents the AO-like anomaly with the large nonlinear scale interactions over half of the Northern Hemisphere. The energy balance for this SVD pattern shows that the nonlinear scale interactions excite the AO-like anomaly. Similarly, the SVD-2 shows the energy increase by the nonlinear scale interactions the same as SVD-1. The nonlinear scale interactions are further decomposed in linear interactions with the climate basic state and the reminder. We find by the energetics analysis that the AO-like anomaly is mostly excited by the interactions with the basic state. It is concluded from the SVD analyses that the extreme events associated with low-frequency variabilities are not induced by the low-frequency forcing, but mostly by the energy supply from the climate basic state.

• 社団法人日本気象学会の論文
• 2005-08-25

著者

• Tanaka Hiroshi

  Center For Computational Sciences University Of Tsukuba:frontier Research Center For Global Change

• Tanaka H.

  Center For Computational Sciences University Of Tsukuba

• MATSUEDA Mio

  Graduate School of Life and Environmental Sciences, University of Tsukuba

• Matsueda Mio

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

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• Seasonal Variation of the Dominant Low-Frequency Variability Observed in the Barotropic Component of the Atmosphere : A Connection to the Arctic Oscillation
• Numerical Simulation of Wind Hole Circulation at Ice Valley in Korea Using a Simple 2D Model(NOTES AND CORRESPONDENCE)
• Analysis of Recent Extreme Events Measured by the Barotropic Component of the Atmosphere
• EOF and SVD Analyses of the Low-Frequency Variability of the Barotropic Component of the Atmosphere
• Teleconnections and the Arctic Oscillation Analyzed in the Barotropic Component of the Model and Observed Atmosphere
• An Analysis of the 3-D Atmospheric Energy Spectra and Interactions Using Analytical Vertical Structure Functions and Two Reanalyses
• Statistical Analysis on the Relationship between Solar and Geomagnetic Activities and the Arctic Oscillation
• Arctic Oscillation Analyzed as a Singular Eigenmode of the Global Atmosphere
• INFLUENCE OF STREAMSIDE SURFACE AREA ON AQUATIC BIOTA AND BIOFILM ACTIVITY

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