Changeset 13954 for NEMO/branches/2020/r13916_ticket2377/doc
- Timestamp:
- 2020-12-01T20:41:49+01:00 (4 years ago)
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NEMO/branches/2020/r13916_ticket2377/doc/latex/NEMO/subfiles/chap_SBC.tex
r13916 r13954 18 18 Release & Author(s) & Modifications \\ 19 19 \hline 20 {\em next} & {\em Simon M{\" u}ller} & {\em Update of \autoref{sec:SBC_TDE} }\\[2mm]20 {\em next} & {\em Simon M{\" u}ller} & {\em Update of \autoref{sec:SBC_TDE}; revision of \autoref{subsec:SBC_fwb}}\\[2mm] 21 21 {\em 4.0} & {\em ...} & {\em ...} \\ 22 22 {\em 3.6} & {\em ...} & {\em ...} \\ … … 1833 1833 \label{subsec:SBC_fwb} 1834 1834 1835 For global ocean simulation, it can be useful to introduce a control of the mean sea level in order to 1836 prevent unrealistic drift of the sea surface height due to inaccuracy in the freshwater fluxes. 1837 In \NEMO, two way of controlling the freshwater budget are proposed: 1835 \begin{listing} 1836 \nlst{namsbc_fwb} 1837 \caption{\forcode{&namsbc_fwb}} 1838 \label{lst:namsbc_fwb} 1839 \end{listing} 1840 1841 For global ocean simulations, it can be useful to introduce a control of the 1842 mean sea level in order to prevent unrealistic drifting of the sea surface 1843 height due to unbalanced freshwater fluxes. In \NEMO, two options for 1844 controlling the freshwater budget are proposed. 1838 1845 1839 1846 \begin{description} 1840 \item [{\np[=0]{nn_fwb}{nn\_fwb}} ] no control at all.1841 The mean sea level isfree to drift, and will certainly do so.1842 \item [{\np[=1]{nn_fwb}{nn\_fwb}} ] global mean \textit{emp}set to zero at each model time step.1847 \item [{\np[=0]{nn_fwb}{nn\_fwb}}:] No control at all; the mean sea level is 1848 free to drift, and will certainly do so. 1849 \item [{\np[=1]{nn_fwb}{nn\_fwb}}:] The global mean \textit{emp} is set to zero at each model time step. 1843 1850 %GS: comment below still relevant ? 1844 1851 %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). 1845 \item [{\np[=2]{nn_fwb}{nn\_fwb}}] freshwater budget is adjusted from the previous year annual mean budget which 1846 is read in the \textit{EMPave\_old.dat} file. 1847 As the model uses the Boussinesq approximation, the annual mean fresh water budget is simply evaluated from 1848 the change in the mean sea level at January the first and saved in the \textit{EMPav.dat} file. 1852 \item [{\np[=2]{nn_fwb}{nn\_fwb}}:] \textit{emp} is adjusted by adding a 1853 spatially uniform, annual-mean freshwater flux that balances the freshwater 1854 budget at the end of the previous year; as the model uses the Boussinesq 1855 approximation, the freshwater budget can be evaluated from the change in the 1856 mean sea level and in the ice and snow mass after the end of each simulation 1857 year; at the start of the model run, an initial adjustment flux can be set 1858 using parameter \np{rn_rwb0}{rn\_fwb0} in namelist \nam{sbc_fwb}{sbc\_fwb}. 1849 1859 \end{description} 1850 1860
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