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Author: Oliver Jahn and Chris Hill |
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This set of examples is based on the barotropic and baroclinic gyre MITgcm configurations, |
This set of examples is based on the barotropic and baroclinic gyre MITgcm configurations, |
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that are described in the tutorial sections \label{sect:eg-baro} and \label{sect:eg-fourlayer}. |
that are described in the tutorial sections \ref{sect:eg-baro} and \ref{sect:eg-fourlayer}. |
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The examples in this section explain how to introduce a passive tracer into the flow |
The examples in this section explain how to introduce a passive tracer into the flow |
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field of the barotropic and baroclinic gyre setups and looks at how the time evolution |
field of the barotropic and baroclinic gyre setups and looks at how the time evolution |
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of the passive tracer depends on the advection or transport scheme that is selected |
of the passive tracer depends on the advection or transport scheme that is selected |
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\end{enumerate} |
\end{enumerate} |
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\subsection{Introducting a tracer into the flow} |
\subsection{Introducing a tracer into the flow} |
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The ptracers package (see section \ref{sec:pkg:ptracers} for a more complete discussion |
The MITgcm ptracers package (see section \ref{sec:pkg:ptracers} for a more complete discussion |
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of the ptracers package) |
of the ptracers package and section \ref{sec:pkg:using} for a general introduction to MITgcm |
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- activating ptracers |
packages) provides pre-coded support for a simple passive tracer with an initial |
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- setting initial distribution |
distribution at simulation time $t=0$ of $C_0(x,y,z)$. The steps required to use this capability |
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are |
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\begin{enumerate} |
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\item{\bf Activating the ptracers package.} This simply requires adding the line {\tt ptracers} to |
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the {\tt packages.conf} file in the {\it code/} directory for the experiment. |
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\item{\bf Setting an initial tracer distribution.} |
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\end{enumerate} |
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Once the two steps above are complete we can proceed to examine how the tracer we have created is |
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carried by the flow field and what properties of the tracer distribution are preserved under |
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different advection schemes. |
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To intro |
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\subsection{Selecting an advection scheme} |
\subsection{Selecting an advection scheme} |
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- flags in data and data.ptracers |
- flags in data and data.ptracers |
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\item{Positive definite} |
\item{Positive definite} |
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\end{enumerate} |
\end{enumerate} |
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\input part3/case_studies/advection_in_gyre_circulation/adv_gyre_figure.tex |
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\begin{figure} |
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\begin{center} |
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\includegraphics*[width=\textwidth]{part3/case_studies/advection_in_gyre_circulation/stats.eps} |
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\end{center} |
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\caption{Maxima, minima and standard deviation (from left) as a function of time (in months) |
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for the gyre circulation experiment from figure~\ref{fig:adv-gyre-all}.} |
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\label{fig:adv-gyre-stats} |
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\end{figure} |
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\subsection{Code and Parameters files for this tutorial} |
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The code and parameters for the experiments can be found in the MITgcm example experiments |
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directory {\it verification/tutorial\_advection\_in\_gyre/}. |
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