which is usually designed as the "*3D-Var*" function (see for example
[Talagrand97]_). The terms "*3D-Var*", "*3D-VAR*" and "*3DVAR*" are equivalent.
-There exists various variants of this algorithm. The following stable and robust formulations are proposed here:
+There exists various variants of this algorithm. The following stable and
+robust formulations are proposed here:
.. index::
pair: Variant ; 3DVAR
pair: Variant ; 3DVAR-Incr
pair: Variant ; 3DVAR-PSAS
-- "3DVAR" (3D Variational analysis, see [Lorenc86]_, [LeDimet86]_, [Talagrand97]_), original and very robust algorithm,
-- "3DVAR-VAN" (3D Variational Analysis with No inversion of B, see [Lorenc88]_), similar algorithm but avoiding inversion of the covariance matrix B,
-- "3DVAR-Incr" (Incremental 3DVAR, see [Courtier94]_), cheaper algorithm but involving an approximation of non-linear operators,
-- "3DVAR-PSAS" (Physical-space Statistical Analysis Scheme for 3DVAR, see [Courtier97]_, [Cohn98]_), algorithm sometimes more cheap because it operates in another space, but involving an approximation of non-linear operators.
+- "3DVAR" (3D Variational analysis, see [Lorenc86]_, [LeDimet86]_, [Talagrand97]_), original classical algorithm and very robust, which operates in the model space,
+- "3DVAR-VAN" (3D Variational Analysis with No inversion of B, see [Lorenc88]_), similar algorithm, which operates in the model space, but avoiding inversion of the covariance matrix B,
+- "3DVAR-Incr" (Incremental 3DVAR, see [Courtier94]_), cheaper algorithm than the previous ones, but involving an approximation of non-linear operators,
+- "3DVAR-PSAS" (Physical-space Statistical Analysis Scheme for 3DVAR, see [Courtier97]_, [Cohn98]_), algorithm sometimes cheaper because it operates in the observation space, but involving an approximation of non-linear operators.
-It is recommended to use the original 3DVAR.
+It is highly recommended to use the original "3DVAR". The "3DVAR" and
+"3DVAR-Incr" algorithms (and not the others) allow modification of the
+initialization point for the minimization, but it is not recommended.
.. ------------------------------------ ..
.. include:: snippets/Header2Algo02.rst
exemple [Talagrand97]_). Les dénominations "*3D-Var*", "*3D-VAR*" et "*3DVAR*"
sont équivalentes.
-Il existe diverses variantes de cet algorithme. On propose ici des formulations stables et robustes suivantes :
+Il existe diverses variantes de cet algorithme. On propose ici les formulations
+stables et robustes suivantes :
.. index::
pair: Variant ; 3DVAR
pair: Variant ; 3DVAR-Incr
pair: Variant ; 3DVAR-PSAS
-- "3DVAR" (3D Variational analysis, voir [Lorenc86]_, [LeDimet86]_, [Talagrand97]_), algorithme d'origine et très robuste,
-- "3DVAR-VAN" (3D Variational Analysis with No inversion of B, voir [Lorenc88]_), algorithme similaire mais permettant d'éviter l'inversion de la matrice de covariance B,
-- "3DVAR-Incr" (Incremental 3DVAR, voir [Courtier94]_), algorithme plus économique mais impliquant une approximation des opérateurs non-linéaires,
-- "3DVAR-PSAS" (Physical-space Statistical Analysis Scheme for 3DVAR, voir [Courtier97]_, [Cohn98]_), algorithme parfois plus économique car opérant dans un autre espace, mais impliquant une approximation des opérateurs non-linéaires.
+- "3DVAR" (3D Variational analysis, voir [Lorenc86]_, [LeDimet86]_, [Talagrand97]_), algorithme classique d'origine, très robuste, opérant dans l'espace du modèle,
+- "3DVAR-VAN" (3D Variational Analysis with No inversion of B, voir [Lorenc88]_), algorithme similaire, opérant dans l'espace du modèle, mais permettant d'éviter l'inversion de la matrice de covariance B,
+- "3DVAR-Incr" (Incremental 3DVAR, voir [Courtier94]_), algorithme plus économique que les précédents, mais impliquant une approximation des opérateurs non-linéaires,
+- "3DVAR-PSAS" (Physical-space Statistical Analysis Scheme for 3DVAR, voir [Courtier97]_, [Cohn98]_), algorithme parfois plus économique car opérant dans l'espace des observations, mais impliquant une approximation des opérateurs non-linéaires.
-On recommande d'utiliser le 3DVAR d'origine.
+On recommande fortement d'utiliser le "3DVAR" d'origine. Les algorithmes
+"3DVAR" et "3DVAR-Incr" (et pas les autres) permettent la modification du point
+initial de leur minimisation, mais ce n'est pas recommandé.
.. ------------------------------------ ..
.. include:: snippets/Header2Algo02.rst
],
listadv = [
"3DVAR-Std",
+ "Incr3DVAR",
"OneCycle3DVAR-Std",
],
)
"3DVAR",
"4DVAR",
"Blue",
- "ExtendedBlue",
+ "DerivativeFreeOptimization",
+ "DifferentialEvolution",
"EnsembleBlue",
- "KalmanFilter",
- "ExtendedKalmanFilter",
"EnsembleKalmanFilter",
- "UnscentedKalmanFilter",
+ "ExtendedBlue",
+ "ExtendedKalmanFilter",
+ "KalmanFilter",
+ "LinearLeastSquares",
+ "NonLinearLeastSquares",
+ "ParticleSwarmOptimization",
"QuantileRegression",
+ "TabuSearch",
+ "UnscentedKalmanFilter",
+ ]
+OptimizationAlgos = [
+ "Blue",
"DerivativeFreeOptimization",
- "ParticleSwarmOptimization",
"DifferentialEvolution",
- "TabuSearch",
+ "KalmanFilter",
"LinearLeastSquares",
"NonLinearLeastSquares",
+ "ParticleSwarmOptimization",
+ "TabuSearch",
+ ]
+ReductionAlgos = [
+ "EnsembleBlue",
+ "EnsembleKalmanFilter",
+ "UnscentedKalmanFilter",
]
CheckAlgos = [
"FunctionTest",