A Cascade Type of Energy Conversion Diagram Based on Mass-Weighted Isentropic Zonal Means and Its Application to Model DiagnosisPrimary Author: Iwasaki, Toshiki
A Cascade Type of Energy Conversion Diagram Based on Mass-Weighted Isentropic Zonal Means and Its
Application to Model Diagnosis
Toshiki Iwasaki
Department of Geophysics
Graduate School of Science
Tohoku University,
Aoba-ku, Sendai, 980-8578, Japan
tel +81-22-795-5779 fax +81-22-795-7758
iwasaki@wind.geophys.tohoku.ac.jp
Diagnostic scheme of global energetics based on mass weighted isentropic zonal means is proposed to analyze climate variability. The mass-weighted isentropic zonal mean is capable of a full expression of wave-mean-flow interactions, including the lower boundary values. It also leads us to very different energy conversion diagram from the convensional four-box model. The energy flow can be represented in a cascade from the zonal mean available potential energy (Pz) to the wave energy (W) via the zonal mean kinetic energy (Kz). By using the new diagnosis package, we diagnose GCM climate and compare it with reanalyses.
References
S. Uno and T. Iwasaki, 2006; A Cascade type global energy conversion diagram based on wave-mean-flow interactions. J. Atmos. Sci. (in press)
D. Tanaka, T. Iwasaki, S. Uno, M. Ujiie and K. Miyazaki, 2004; Eliassen-Palm flux diagnosis based on isentropic representation, J. Atmos. Sci., 61,2370-2383.
T. Iwasaki, 2001: Atmospheric energy cycle viewed from wave, mean-flow interaction and Lagrangian mean circulation, J. Atmos. Sci.,58,3036-3052.
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