Seasonal Variation of the Dominant Low-Frequency Variability Observed in the Barotropic Component of the Atmosphere : A Connection to the Arctic Oscillation

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概要

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• In this study, EOF analyses are conducted for the barotropic component of the atmosphere in the Northern Hemisphere for each season to investigate the dominant low-frequency variability in the atmosphere. It shows that the structure of the Arctic Oscillation (AO) appears in winter and spring as a dominant mode. In summer and fall, however, the dominant modes are not the annular pattern, but show more localized structures. The seasonal variation of the dynamical SVD-1 mode is analyzed using the climate basic states based on the singular eigenmode theory by Tanaka and Matsueda (2005) to compare with the observed EOF-1 for each season. It is found that the AO-like structure appears robustly in DJF when hyper diffusion is used in the model. The AO-like pattern obtained by observed EOF-1 appears in MAM when the viscosity is changed to the bi-harmonic diffusion. But the structures obtained as the SVD-1 in JJA and SON are different from that of the observed EOF-1. From this result, we may conclude that the AO in winter is explained by the singular eigenmode theory. However, the dominant low-frequency variability in other seasons are unlikely to be the singular eigenmode of the dynamical system explained by the SVD analysis.

• 社団法人日本気象学会の論文
• 2007-12-25

著者

• Yokoyama Naomi

  Graduate School Of Life And Environmental Sciences University Of Tsukuba

• Tanaka H.

  Center For Computational Sciences University Of Tsukuba

関連論文

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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
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• 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
• INFLUENCE OF STREAMSIDE SURFACE AREA ON AQUATIC BIOTA AND BIOFILM ACTIVITY

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