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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}. |
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The example in this section explains 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 |
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of the passive tracer depends on the advection or transport scheme that is selected |
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for the tracer. |
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Passive tracers are useful in many numerical experiments. In some cases tracers are |
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used to track flow pathways, for example in \cite{Dutay02} a passive tracer is used |
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to track pathways of CFC-11 in 13 global ocean models (similar to the example |
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described in section \ref{sect:eg-offline-cfc}). |
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In other cases tracers are used as a way |
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to infer bulk mixing coefficients for a turbulent flow field, for example in ...... In |
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biogeochemical and ecological simulations large numbers of tracers are used that carry the |
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concentrations of biological nutrients and concentrations of biological species. |
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When using tracers for these and other purposes it is useful to have a feel for the role |
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that the advection scheme employed plays in determining properties of the tracer distribution. |
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\subsection{Advection and tracer transport} |
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