[10896] | 1 | % ================================================================ |
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| 2 | % INTRODUCTION |
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| 3 | % ================================================================ |
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| 4 | |
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| 5 | \chapter*{Introduction} |
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| 6 | |
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| 7 | TOP (Tracers in the Ocean Paradigm) handles oceanic passive tracers in NEMO. At present, this component provides the physical constraints and boundaries conditions for oceanic tracers transport and represents a generalized, hardwired interface toward biogeochemical models to enable a seamless coupling. |
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| 8 | |
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[11591] | 9 | It includes three independent components : |
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[10896] | 10 | |
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| 11 | \begin{itemize} |
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| 12 | \item a transport code TRP sharing the same advection/diffusion routines with the dynamics, with specific treatment of some features like the surface boundary |
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| 13 | conditions, or the positivity of passive tracers concentrations |
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| 14 | \item sources and sinks - SMS - models that can be typically biogeochemical, biological or radioactive |
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| 15 | \item an offline option which is a simplified OPA 9 model using fields of physics variables that are previously stored to disk |
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| 16 | \end{itemize} |
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| 17 | |
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| 18 | There is two ways of coupling TOP to the dynamics : |
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| 19 | |
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| 20 | \begin{itemize} |
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| 21 | \item \textit{online coupling} : the evolution of passive tracers is computed along with the dynamics |
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| 22 | \item \textit{offline coupling} : the fields of physics variables are read from files and interpolated at each model time step, with no constraints on the time sampling in the input files |
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| 23 | \end{itemize} |
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| 24 | |
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| 25 | TOP is designed to handle multiple oceanic tracers through a modular approach and it includes different sub-modules : |
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| 26 | |
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| 27 | \begin{itemize} |
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| 28 | \item the ocean water age module (AGE) tracks down the time-dependent spread of surface waters into the ocean interior |
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| 29 | \item inorganic carbon (e.g. CFCs, SF6) and radiocarbon (C14) passive tracers can be modeled to assess ocean absorption timescales of anthropogenic emissions and further address water masses ventilation |
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| 30 | \item a built-in biogeochemical model (PISCES) to simulate lower trophic levels ecosystem dynamics in the global ocean |
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| 31 | \item a prototype tracer module (MY\_TRC) to enable user-defined cases or the coupling with alternative biogeochemical models ( e.g. BFM, MEDUSA, ERSEM, BFM, ECO3M) |
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| 32 | \end{itemize} |
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| 33 | |
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[11591] | 34 | \begin{figure}[ht] |
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[10896] | 35 | \begin{center} |
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| 36 | \vspace{0cm} |
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[11019] | 37 | \includegraphics[width=0.80\textwidth]{Fig_TOP_design} |
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| 38 | %\includegraphics[height=6cm,angle=-00]{Fig_TOP_design} |
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[10896] | 39 | \caption{A schematic view of NEMO-TOP component} |
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| 40 | \label{topdesign} |
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[11591] | 41 | \end{center} |
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[10896] | 42 | \end{figure} |
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