Tangent linear model

tangent linear model

(Abbreviated TLM.) A model, comprising tangent linear equations, that maps a perturbation vector, δx(t₁) = Lδx(t₀), from initial time t₀ to forecast time t₁.

Here, L is the tangent linear operator and x is the model state vector. A TLM provides a first-order approximation to the evolution of perturbations in a nonlinear forecast trajectory.
See tangent linear approximation, small perturbation, adjoint model.

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