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- 2010-11-11T18:01:29+01:00 (13 years ago)
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branches/nemo_v3_3_beta/DOC/TexFiles/Chapters/Chap_Model_Basics_zstar.tex
r996 r2376 117 117 118 118 %> > > > > > > > > > > > > > > > > > > > > > > > > > > > 119 \begin{figure}[!t] \label{Fig_DYN_dynspg_ts} 120 \begin{center} 119 \begin{figure}[!t] \begin{center} 121 120 \includegraphics[width=0.90\textwidth]{./Figures/Fig_DYN_dynspg_ts.pdf} 122 \caption{Schematic of the split-explicit time stepping scheme for the barotropic and baroclinic modes, after \citet{Griffies2004}. Time increases to the right. Baroclinic time steps are denoted by $t-\Delta t$, $t, t+\Delta t$, and $t+2\Delta t$. The curved line represents a leap-frog time step, and the smaller barotropic time steps $N \Delta t=2\Delta t$ are denoted by the zig-zag line. The vertically integrated forcing \textbf{M}(t) computed at baroclinic time step t represents the interaction between the barotropic and baroclinic motions. While keeping the total depth, tracer, and freshwater forcing fields fixed, a leap-frog integration carries the surface height and vertically integrated velocity from t to $t+2 \Delta t$ using N barotropic time steps of length $\Delta t$. Time averaging the barotropic fields over the N+1 time steps (endpoints included) centers the vertically integrated velocity at the baroclinic timestep $t+\Delta t$. A baroclinic leap-frog time step carries the surface height to $t+\Delta t$ using the convergence of the time averaged vertically integrated velocity taken from baroclinic time step t. } 121 \caption{ \label{Fig_DYN_dynspg_ts} 122 Schematic of the split-explicit time stepping scheme for the barotropic and baroclinic modes, 123 after \citet{Griffies2004}. Time increases to the right. Baroclinic time steps are denoted by 124 $t-\Delta t$, $t, t+\Delta t$, and $t+2\Delta t$. The curved line represents a leap-frog time step, 125 and the smaller barotropic time steps $N \Delta t=2\Delta t$ are denoted by the zig-zag line. 126 The vertically integrated forcing \textbf{M}(t) computed at baroclinic time step t represents 127 the interaction between the barotropic and baroclinic motions. While keeping the total depth, 128 tracer, and freshwater forcing fields fixed, a leap-frog integration carries the surface height 129 and vertically integrated velocity from t to $t+2 \Delta t$ using N barotropic time steps of length 130 $\Delta t$. Time averaging the barotropic fields over the N+1 time steps (endpoints included) 131 centers the vertically integrated velocity at the baroclinic timestep $t+\Delta t$. 132 A baroclinic leap-frog time step carries the surface height to $t+\Delta t$ using the convergence 133 of the time averaged vertically integrated velocity taken from baroclinic time step t. } 123 134 \end{center} 124 135 \end{figure}
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