Discussion
Which quantity does a singular vector calculation identify?
Answer: D
Singular vectors are the initial perturbations that amplify most over a finite time, which differs from the fastest growing normal mode because the atmosphere is not in a steady state. Transient non-modal growth can substantially exceed modal growth over a few days. This distinction between finite time and asymptotic growth is central to modern predictability theory. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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