source: NEMO/trunk/doc/latex/SI3/subfiles/chap_transport.tex @ 11015

Last change on this file since 11015 was 11015, checked in by nicolasmartin, 17 months ago

Modification of the content to be in line with the NEMO manual
SI3 manual can now be build like the NEMO manual with ./ SI3

  • Mimick the directory organisation with main and subfiles folders.
  • Regarding the particular case of namelists
    • Remove the duplicates already contained in the global namelists folder at 1st level of ./doc
    • Keep the namelists sub-folder only for namdyn_adv & namsbc which already exist in ocean namelists
  • Rewriting of SI3_manual.tex with NEMO_manual.tex as template to easily highlight differences
  • Updating of several paths for figures/namelists inclusion or LaTeX files referencing
  • LaTeX source:
    • Replacement of \forfile command for namelists with pre-configured \nlst alias
    • " "" \bm with \mathbf (save installation of an extra package)
File size: 1.8 KB
6% ================================================================
7% Chapter 4 Ñ Ice transport
8% ================================================================
10\chapter{Ice transport}
15$\ $\newline    % force a new line
17As soon as ice dynamics are activated (\textit{ln\_dyn\_xxx}), all extensive state variables are to be advected following the horizontal velocity field.
19\section{Second order moments conserving (Prather 1986) scheme (\textit{ln\_adv\_Pra})}
21The scheme of  \cite{Prather86} explicitly computes the conservation of second-order moments of the spatial distribution of global sea ice state variables. This scheme preserves positivity of the transported variables and is practically non-diffusive. It is also computationally expensive, however it allows to localize the ice edge quite accurately. As the scheme is conditionally stable, the time step is split into two parts if the ice drift is too fast, based on the CFL criterion.
23State variables per unit grid cell area are first multiplied by grid cell area. Then, for each state variable, the 0$^{th}$ (mean), 1$^{st}$ (x, y) and 2$^{nd}$ (xx, xy, yy) order moments of the spatial distribution are transported. At 1st time step, all moments are zero (if prescribed initial state); or read from a restart file, and then evolve through the course of the run. Therefore, for each global variable, 5 additional tracers have to be kept into memory and written in the restart file, which significantly increases the required memory. Advection following x and y are computed independently. The succession order of x- and y- advection is reversed every day.
25\section{5$^{th}$ order flux-corrected transport scheme (UM5)}
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