Changeset 11577 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
- Timestamp:
- 2019-09-19T19:01:38+02:00 (5 years ago)
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NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
r11567 r11577 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 \nam{ \_asminc}.28 This is all controlled by the namelist \nam{_asminc}{\_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. … … 37 37 Direct initialization (DI) refers to the instantaneous correction of the model background state using 38 38 the analysis increment. 39 DI is used when \np{ln \_asmdin} is set to true.39 DI is used when \np{ln_asmdin}{ln\_asmdin} is set to true. 40 40 41 41 \section{Incremental analysis updates} … … 47 47 This technique is referred to as Incremental Analysis Updates (IAU) \citep{bloom.takacs.ea_MWR96}. 48 48 IAU is a common technique used with 3D assimilation methods such as 3D-Var or OI. 49 IAU is used when \np{ln \_asmiau} is set to true.49 IAU is used when \np{ln_asmiau}{ln\_asmiau} is set to true. 50 50 51 51 With IAU, the model state trajectory ${\mathbf x}$ in the assimilation window ($t_{0} \leq t_{i} \leq t_{N}$) … … 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 \nam{\_asminc} namelist136 The divergence damping is activated by assigning to \np{nn_divdmp}{nn\_divdmp} in the \nam{_asminc}{\_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 \nam{ \_asminc} namelist and the header of an example assimilation increments file on146 Here we show an example \nam{_asminc}{\_asminc} namelist and the header of an example assimilation increments file on 147 147 the ORCA2 grid. 148 148
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