# Changeset 2570 for trunk/DOC/TexFiles/Chapters/Introduction.tex

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Timestamp:
2011-01-27T15:32:46+01:00 (10 years ago)
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v3.3beta: #658 small correction in the introduction

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 r2541 $\bullet$ The main modifications from OPA v8 and NEMO/OPA v3.2 are :\\ (1) transition to full native \textsc{Fortran} 90, deep code restructuring and drastic reduction of CPP keys; \\ (2) introduction of partial step representation of bottom topography \citep{Barnier_al_OD06, Le_Sommer_al_OM09, Penduff_al_OS07}; \\ (3) partial reactivation of a terrain-following vertical coordinate ($s$- and hybrid $s$-$z$) \begin{enumerate} \item transition to full native \textsc{Fortran} 90, deep code restructuring and drastic reduction of CPP keys; \item introduction of partial step representation of bottom topography \citep{Barnier_al_OD06, Le_Sommer_al_OM09, Penduff_al_OS07}; \item partial reactivation of a terrain-following vertical coordinate ($s$- and hybrid $s$-$z$) with the addition of several options for pressure gradient computation \footnote{Partial support of $s$-coordinate: there is presently no support for neutral physics in $s$- coordinate and for the new options for horizontal pressure gradient computation with a non-linear equation of state.}; \\ (4) more choices for the treatment of the free surface: full explicit, split-explicit or filtered schemes. \\ (5) suppression of the rigid-lid option;\\ (6) non linear free surface option (associated with the rescaled height coordinate \textit{z*} or  \textit{s}); \\ (6) additional schemes for vector and flux forms of the momentum  advection; \\ (7) additional advection schemes for tracers; \\ (8) implementation of the AGRIF package (Adaptative Grid Refinement in \textsc{Fortran}) \citep{Debreu_al_CG2008}; \\ (9) online diagnostics : tracers trend in the mixed layer and vorticity balance; \\ (10) rewriting of the I/O management with the use of an I/O server; \\ (11) generalized ocean-ice-atmosphere-CO2 coupling interface, interfaced with OASIS 3 coupler. \\ (12) surface module (SBC) that simplify the way the ocean is forced and include two bulk formulea (CLIO and CORE) and which includes an on-the-fly interpolation of input forcing fields\\ (13) RGB light penetration and optional use of ocean color (14) major changes in the TKE schemes: it now includes a Langmuir cell parameterization  \citep{Axell_JGR02}, a non-linear equation of state.}; \item more choices for the treatment of the free surface: full explicit, split-explicit or filtered schemes, and suppression of the rigid-lid option; \item non linear free surface associated with the rescaled height coordinate \textit{z*} or  \textit{s}; \item additional schemes for vector and flux forms of the momentum  advection; \item additional advection schemes for tracers; \item implementation of the AGRIF package (Adaptative Grid Refinement in \textsc{Fortran}) \citep{Debreu_al_CG2008}; \item online diagnostics : tracers trend in the mixed layer and vorticity balance; \item rewriting of the I/O management with the use of an I/O server; \item generalized ocean-ice-atmosphere-CO2 coupling interface, interfaced with OASIS 3 coupler ; \item surface module (SBC) that simplify the way the ocean is forced and include two bulk formulea (CLIO and CORE) and which includes an on-the-fly interpolation of input forcing fields ; \item RGB light penetration and optional use of ocean color \item major changes in the TKE schemes: it now includes a Langmuir cell parameterization  \citep{Axell_JGR02}, the \citet{Mellor_Blumberg_JPO04} surface wave breaking parameterization, and has a time discretization which is energetically consistent with the ocean model equations \citep{Burchard_OM02, Marsaleix_al_OM08}; \\ (15) tidal mixing parametrisation (bottom intensification) + Indonesian specific tidal mixing \citep{Koch-Larrouy_al_GRL07}; \\ (16) introduction of LIM-3, the new Louvain-la-Neuve sea-ice model (C-grid rheology and which is energetically consistent with the ocean model equations \citep{Burchard_OM02, Marsaleix_al_OM08}; \item tidal mixing parametrisation (bottom intensification) + Indonesian specific tidal mixing \citep{Koch-Larrouy_al_GRL07}; \item introduction of LIM-3, the new Louvain-la-Neuve sea-ice model (C-grid rheology and new thermodynamics including bulk ice salinity) \citep{Vancoppenolle_al_OM09a, Vancoppenolle_al_OM09b} \end{enumerate} \vspace{1cm} $\bullet$ The main modifications from NEMO/OPA v3.2 and  v3.3 are :\\ (1) introduction of a modified leapfrog-Asselin filter time stepping scheme \citep{Leclair_Madec_OM09}; \\ (2) additional scheme for iso-neutral mixing \citep{Griffies_al_JPO98}, although it is still a "work in progress"; \\ (3) a rewriting of the bottom boundary layer scheme, following \citet{Campin_Goosse_Tel99}; \\ (4) addition of a Generic Length Scale vertical mixing scheme, following \citet{Umlauf_Burchard_JMS03}; (5) addition of the atmospheric pressure as an external forcing on both ocean and sea-ice dynamics; \\ (6) addition of a diurnal cycle on solar radiation \citep{Bernie_al_CD07}; \\ (7) river runoffs added through a non-zero depth, and having its own temperature and salinity; \\ (8) CORE II normal year forcing set as the default forcing of ORCA2-LIM configuration ; \\ (9) generalisation of the use of \mdl{fldread} for all input fields (ocean, climatology, sea-ice damping...) (10) addition of an on-line observation and model comparison (thanks to NEMOVAR project); \\ (11) optional application of an assimilation increment (thanks to NEMOVAR project); \\ (12) coupling interface adjusted for WRF atmospheric model (13) C-grid ice rheology now available fro both LIM-2 and LIM-3 \citep{Bouillon_al_OM09}; \\ (14) a deep re-writting and simplification of the off-line tracer component (OFF\_SRC) ;  \\ (15) the merge of passive and active advection and diffusion modules \\ (16)  Use of the Flexible Configuration Manager (FCM) to build configurations, generate the Makefile and produce the executable ; \\ (17) Linear-tangent and Adjoint component (TAM) added, phased with v3.0 \begin{enumerate} \item introduction of a modified leapfrog-Asselin filter time stepping scheme \citep{Leclair_Madec_OM09}; \item additional scheme for iso-neutral mixing \citep{Griffies_al_JPO98}, although it is still a "work in progress"; \item a rewriting of the bottom boundary layer scheme, following \citet{Campin_Goosse_Tel99}; \item addition of a Generic Length Scale vertical mixing scheme, following \citet{Umlauf_Burchard_JMS03}; \item addition of the atmospheric pressure as an external forcing on both ocean and sea-ice dynamics; \item addition of a diurnal cycle on solar radiation \citep{Bernie_al_CD07}; \item river runoffs added through a non-zero depth, and having its own temperature and salinity; \item CORE II normal year forcing set as the default forcing of ORCA2-LIM configuration ; \item generalisation of the use of \mdl{fldread} for all input fields (ocean climatology, sea-ice damping...) ; \item addition of an on-line observation and model comparison (thanks to NEMOVAR project); \item optional application of an assimilation increment (thanks to NEMOVAR project); \item coupling interface adjusted for WRF atmospheric model; \item C-grid ice rheology now available fro both LIM-2 and LIM-3 \citep{Bouillon_al_OM09}; \item LIM-3 ice-ocean momentum coupling applied to LIM-2 ; \item a deep re-writting and simplification of the off-line tracer component (OFF\_SRC) ; \item the merge of passive and active advection and diffusion modules ; \item  Use of the Flexible Configuration Manager (FCM) to build configurations, generate the Makefile and produce the executable ; \item Linear-tangent and Adjoint component (TAM) added, phased with v3.0 \end{enumerate} \vspace{1cm} In addition, several minor modifications in the coding have been introduced with the constant