Changeset 11435 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
- Timestamp:
- 2019-08-14T14:45:08+02:00 (5 years ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
r11316 r11435 8 8 \label{chap:ASM} 9 9 10 \ minitoc10 \chaptertoc 11 11 12 12 \vfill … … 15 15 \begin{tabular}{l||l|m{0.65\linewidth}} 16 16 Release & Author & Modifications \\ 17 {\em 4.0} & {\em D. J. Lea} & {\em \NEMO 4.0 updates} \\17 {\em 4.0} & {\em D. J. Lea} & {\em \NEMO\ 4.0 updates} \\ 18 18 {\em 3.4} & {\em D. J. Lea, M. Martin, K. Mogensen, A. Weaver} & {\em Initial version} \\ 19 19 \end{tabular} … … 26 26 These are read into the model from a NetCDF file which may be produced by separate data assimilation code. 27 27 The code can also output model background fields which are used as an input to data assimilation code. 28 This is all controlled by the namelist \ textit{\ngn{nam\_asminc}}.28 This is all controlled by the namelist \nam{\_asminc}. 29 29 There is a brief description of all the namelist options provided. 30 30 To build the ASM code \key{asminc} must be set. … … 101 101 102 102 It is quite challenging for data assimilation systems to provide non-divergent velocity increments. 103 Applying divergent velocity increments will likely cause spurious vertical velocities in the model. This section describes a method to take velocity increments provided to \NEMO ($u^0_I$ and $v^0_I$) and adjust them by the iterative application of a divergence damping operator. The method is also described in \citet{dobricic.pinardi.ea_OS07}.103 Applying divergent velocity increments will likely cause spurious vertical velocities in the model. This section describes a method to take velocity increments provided to \NEMO\ ($u^0_I$ and $v^0_I$) and adjust them by the iterative application of a divergence damping operator. The method is also described in \citet{dobricic.pinardi.ea_OS07}. 104 104 105 105 In iteration step $n$ (starting at $n=1$) new estimates of velocity increments $u^{n}_I$ and $v^{n}_I$ are updated by: … … 134 134 \citep{talagrand_JAS72, dobricic.pinardi.ea_OS07}. 135 135 Diffusion coefficients are defined as $A_D = \alpha e_{1t} e_{2t}$, where $\alpha = 0.2$. 136 The divergence damping is activated by assigning to \np{nn\_divdmp} in the \ textit{nam\_asminc} namelist136 The divergence damping is activated by assigning to \np{nn\_divdmp} in the \nam{\_asminc} namelist 137 137 a value greater than zero. 138 138 This specifies the number of iterations of the divergence damping. Setting a value of the order of 100 will result in a significant reduction in the vertical velocity induced by the increments. … … 144 144 \label{sec:ASM_details} 145 145 146 Here we show an example \n gn{nam\_asminc} namelist and the header of an example assimilation increments file on146 Here we show an example \nam{\_asminc} namelist and the header of an example assimilation increments file on 147 147 the ORCA2 grid. 148 148
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