![]() ![]() (e) Phase difference in the Z– B cross spectrum and slopes corresponding to 1- and 3-day lags. (d) Lagged correlation between the leading baroclinicity mode and zonal index. (c) Logarithmic decay rate of baroclinicity autocorrelation. (b) Autocorrelation of leading baroclinicity mode (thick solid), red noise (thick dash–dotted), zonal index (dashed), and dynamical forcing (thin solid). (a) Leading two modes of baroclinicity variability (amplitude corresponds to one standard deviation of the corresponding principal component). #The persistence of time Offline(f) Autocorrelation predicted by the offline model forced by the high- and low-frequency parts of the eddy forcing, filtered as in (e). (d) Cross correlation between zonal index and eddy momentum forcing. (c) Logarithmic decay rate of zonal index autocorrelation, emphasizing regions of positive (light shading) and negative (dark shading) feedback. (b) Autocorrelation of eddy momentum forcing (thin solid), zonal index (thick solid), offline model approximation (thick dashed), and red noise (thick dash–dotted). (a) Leading mode of barotropic (BT) zonal-wind variability (thick solid) and regression on its normalized principal component of upper-layer (thin solid) and lower-layer (thin dashed) zonal wind. Climatology of the control run: (a) zonal-mean zonal wind (thick, lower-level dashed) and radiative equilibrium jet (thin) and (b) eddy heat flux (m K s −1 thick) and upper-level eddy momentum flux (m 2 s −2 thin). ![]()
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