Changeset 13950

Timestamp:

2020-12-01T18:33:58+01:00 (4 years ago)

Author:

smueller

Message:

Update of the documentation subsection on the freshwater-budget adjustment mechanism (ticket #2377)

File:

• NEMO/branches/2020/ticket2377/doc/latex/NEMO/subfiles/chap_SBC.tex (modified) (2 diffs)

NEMO/branches/2020/ticket2377/doc/latex/NEMO/subfiles/chap_SBC.tex

@@ -18 +18 @@
     Release & Author(s) & Modifications \\
     \hline
+    {\em  next} & {\em S. M\" uller} & {\em Revision of \autoref{subsec:SBC_fwb}}\\
     {\em   4.0} & {\em ...} & {\em ...} \\
     {\em   3.6} & {\em ...} & {\em ...} \\
@@ -1795 +1796 @@
 \label{subsec:SBC_fwb}
 
-For global ocean simulation, it can be useful to introduce a control of the mean sea level in order to
-prevent unrealistic drift of the sea surface height due to inaccuracy in the freshwater fluxes.
-In \NEMO, two way of controlling the freshwater budget are proposed:
+\begin{listing}
+  \nlst{namsbc_fwb}
+  \caption{\forcode{&namsbc_fwb}}
+  \label{lst:namsbc_fwb}
+\end{listing}
+
+For global ocean simulations, it can be useful to introduce a control of the
+mean sea level in order to prevent unrealistic drifting of the sea surface
+height due to unbalanced freshwater fluxes. In \NEMO, two options for
+controlling the freshwater budget are proposed.
 
 \begin{description}
-\item [{\np[=0]{nn_fwb}{nn\_fwb}}] no control at all.
-  The mean sea level is free to drift, and will certainly do so.
-\item [{\np[=1]{nn_fwb}{nn\_fwb}}] global mean \textit{emp} set to zero at each model time step.
+\item [{\np[=0]{nn_fwb}{nn\_fwb}}:] No control at all; the mean sea level is
+  free to drift, and will certainly do so.
+\item [{\np[=1]{nn_fwb}{nn\_fwb}}:] The global mean \textit{emp} is set to zero at each model time step.
   %GS: comment below still relevant ?
   %Note that with a sea-ice model, this technique only controls the mean sea level with linear free surface and no mass flux between ocean and ice (as it is implemented in the current ice-ocean coupling).
-\item [{\np[=2]{nn_fwb}{nn\_fwb}}] freshwater budget is adjusted from the previous year annual mean budget which
-  is read in the \textit{EMPave\_old.dat} file.
-  As the model uses the Boussinesq approximation, the annual mean fresh water budget is simply evaluated from
-  the change in the mean sea level at January the first and saved in the \textit{EMPav.dat} file.
+\item [{\np[=2]{nn_fwb}{nn\_fwb}}:] \textit{emp} is adjusted by adding a
+  spatially uniform, annual-mean freshwater flux that balances the freshwater
+  budget at the end of the previous year; as the model uses the Boussinesq
+  approximation, the freshwater budget can be evaluated from the change in the
+  mean sea level and in the ice and snow mass after the end of each simulation
+  year; at the start of the model run, an initial adjustment flux can be set
+  using parameter \np{rn_rwb0}{rn\_fwb0} in namelist \nam{sbc_fwb}{sbc\_fwb}.
 \end{description}