Changeset 11151 for NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
- Timestamp:
- 2019-06-20T14:59:58+02:00 (5 years ago)
- File:
-
- 1 edited
Legend:
- Unmodified
- Added
- Removed
-
NEMO/trunk/doc/latex/NEMO/subfiles/chap_ASM.tex
r11123 r11151 41 41 IAU is used when \np{ln\_asmiau} is set to true. 42 42 43 With IAU, the model state trajectory ${\ bf x}$ in the assimilation window ($t_{0} \leq t_{i} \leq t_{N}$)43 With IAU, the model state trajectory ${\mathbf x}$ in the assimilation window ($t_{0} \leq t_{i} \leq t_{N}$) 44 44 is corrected by adding the analysis increments for temperature, salinity, horizontal velocity and SSH as 45 45 additional tendency terms to the prognostic equations: 46 46 \begin{align*} 47 47 % \label{eq:wa_traj_iau} 48 {\ bf x}^{a}(t_{i}) = M(t_{i}, t_{0})[{\bf x}^{b}(t_{0})] \; + \; F_{i} \delta \tilde{\bf x}^{a}48 {\mathbf x}^{a}(t_{i}) = M(t_{i}, t_{0})[{\mathbf x}^{b}(t_{0})] \; + \; F_{i} \delta \tilde{\mathbf x}^{a} 49 49 \end{align*} 50 where $F_{i}$ is a weighting function for applying the increments $\delta\tilde{\ bf x}^{a}$ defined such that50 where $F_{i}$ is a weighting function for applying the increments $\delta\tilde{\mathbf x}^{a}$ defined such that 51 51 $\sum_{i=1}^{N} F_{i}=1$. 52 ${\ bf x}^b$ denotes the model initial state and ${\bf x}^a$ is the model state after the increments are applied.52 ${\mathbf x}^b$ denotes the model initial state and ${\mathbf x}^a$ is the model state after the increments are applied. 53 53 To control the adjustment time of the model to the increment, 54 54 the increment can be applied over an arbitrary sub-window, $t_{m} \leq t_{i} \leq t_{n}$, … … 62 62 =\left\{ 63 63 \begin{array}{ll} 64 0 & {\ rm if} \; \; \; t_{i} < t_{m} \\65 1/M & {\ rm if} \; \; \; t_{m} < t_{i} \leq t_{n} \\66 0 & {\ rm if} \; \; \; t_{i} > t_{n}64 0 & {\mathrm if} \; \; \; t_{i} < t_{m} \\ 65 1/M & {\mathrm if} \; \; \; t_{m} < t_{i} \leq t_{n} \\ 66 0 & {\mathrm if} \; \; \; t_{i} > t_{n} 67 67 \end{array} 68 68 \right. … … 76 76 =\left\{ 77 77 \begin{array}{ll} 78 0 & {\ rm if} \; \; \; t_{i} < t_{m} \\79 \alpha \, i & {\ rm if} \; \; \; t_{m} \leq t_{i} \leq t_{M/2} \\80 \alpha \, (M - i +1) & {\ rm if} \; \; \; t_{M/2} < t_{i} \leq t_{n} \\81 0 & {\ rm if} \; \; \; t_{i} > t_{n}78 0 & {\mathrm if} \; \; \; t_{i} < t_{m} \\ 79 \alpha \, i & {\mathrm if} \; \; \; t_{m} \leq t_{i} \leq t_{M/2} \\ 80 \alpha \, (M - i +1) & {\mathrm if} \; \; \; t_{M/2} < t_{i} \leq t_{n} \\ 81 0 & {\mathrm if} \; \; \; t_{i} > t_{n} 82 82 \end{array} 83 83 \right.
Note: See TracChangeset
for help on using the changeset viewer.