Changeset 9393 for branches/2017/dev_merge_2017/DOC/tex_sub/chap_ASM.tex
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- 2018-03-13T15:00:56+01:00 (6 years ago)
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branches/2017/dev_merge_2017/DOC/tex_sub/chap_ASM.tex
r9392 r9393 4 4 % Chapter Assimilation increments (ASM) 5 5 % ================================================================ 6 \chapter{Apply assimilation increments (ASM)}6 \chapter{Apply Assimilation Increments (ASM)} 7 7 \label{ASM} 8 8 … … 30 30 Direct initialization (DI) refers to the instantaneous correction 31 31 of the model background state using the analysis increment. 32 DI is used when \np{ln _asmdin} is set to true.32 DI is used when \np{ln\_asmdin} is set to true. 33 33 34 \section{Incremental Analysis Updates}34 \section{Incremental analysis updates} 35 35 \label{ASM_IAU} 36 36 … … 40 40 is referred to as Incremental Analysis Updates (IAU) \citep{Bloom_al_MWR96}. 41 41 IAU is a common technique used with 3D assimilation methods such as 3D-Var or OI. 42 IAU is used when \np{ln _asmiau} is set to true.42 IAU is used when \np{ln\_asmiau} is set to true. 43 43 44 44 With IAU, the model state trajectory ${\bf x}$ in the assimilation window … … 117 117 integration \citep{Talagrand_JAS72, Dobricic_al_OS07}. Diffusion coefficients are defined as 118 118 $A_D = \alpha e_{1t} e_{2t}$, where $\alpha = 0.2$. The divergence damping is activated by 119 assigning to \np{nn _divdmp} in the \textit{nam\_asminc} namelist a value greater than zero.119 assigning to \np{nn\_divdmp} in the \textit{nam\_asminc} namelist a value greater than zero. 120 120 By choosing this value to be of the order of 100 the increments in the vertical velocity will 121 121 be significantly reduced.
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