Changeset 11694 for NEMO/trunk/doc/latex/TOP/subfiles/model_description.tex
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 20191014T14:54:50+02:00 (13 months ago)
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NEMO/trunk/doc/latex/TOP/subfiles/model_description.tex
r11591 r11694 14 14 \chapter{Model Description} 15 15 \label{chap:ModDes} 16 \ minitoc16 \chaptertoc 17 17 18 18 \section{Basics} … … 80 80 \nlst{namtrc_ldf} 81 81 % 82 In NEMO v4.0, the passive tracer diffusion has necessarily the same form as the active tracer diffusion, meaning that the numerical scheme must be the same. However the passive tracer mixing coefficient can be chosen as a multiple of the active ones by changing the value of \textit{rn\_ldf\_multi} in namelist \textit{namtrc\_ldf}. The choice of numerical scheme is then set in the \n gn{namtra\_ldf} namelist for the dynamic described in section 5.2 of \citep{nemo_manual}.82 In NEMO v4.0, the passive tracer diffusion has necessarily the same form as the active tracer diffusion, meaning that the numerical scheme must be the same. However the passive tracer mixing coefficient can be chosen as a multiple of the active ones by changing the value of \textit{rn\_ldf\_multi} in namelist \textit{namtrc\_ldf}. The choice of numerical scheme is then set in the \nam{namtra_ldf}{namtra\_ldf} namelist for the dynamic described in section 5.2 of \citep{nemo_manual}. 83 83 84 84 … … 95 95 96 96 The use of newtonian damping to climatological fields or observations is also coded, sharing the same routine dans active tracers. Boolean variables are defined in the namelist\_top\_ref to select the tracers on which restoring is applied 97 Options are defined through the \ngn{namtrc\_dmp} namelist variables. The restoring term is added when the namelist parameter \np{ln\_trcdmp} is set to true. The restoring coefficient is a threedimensional array read in a file, which name is specified by the namelist variable \np{cn\_resto\_tr}. This netcdf file can be generated using the DMP\_TOOLS tool.97 Options are defined through the \nam{namtrc_dmp}{namtrc\_dmp} namelist variables. The restoring term is added when the namelist parameter \np{ln\_trcdmp} is set to true. The restoring coefficient is a threedimensional array read in a file, which name is specified by the namelist variable \np{cn\_resto\_tr}. This netcdf file can be generated using the DMP\_TOOLS tool. 98 98 99 99 \subsection{ Tracer positivity} … … 104 104 105 105 Sometimes, numerical scheme can generates negative values of passive tracers concentration that must be positive. For exemple, isopycnal diffusion can created extrema. The trcrad routine artificially corrects negative concentrations with a very crude solution that either sets negative concentration to zero without adjusting the tracer budget, or by removing negative concentration and keeping mass conservation. 106 The treatment of negative concentrations is an option and can be selected in the namelist \n gn{namtrc\_rad} by setting the parameter \np{ln\_trcrad} to true.106 The treatment of negative concentrations is an option and can be selected in the namelist \nam{namtrc_rad}{namtrc\_rad} by setting the parameter \np{ln\_trcrad} to true. 107 107 108 108 \section{The SMS modules}
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