Abstract:This study investigates low-frequency, unstable planetary waves in realistic basis states of January 1979, using three-dimensional spectral primitive equations derived by orthonormal vertical structure functions and Hough harmonics. Eigenfrequencies, modal structures, and energetics are contrasted for the zonal basic state and the zonally varying basic state. Three selected unstable modes are extensively examined. One is the Green mode in the planetary waves, and the other two are deep Charney modes having dif… Show more
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