Discussion
Which process removes spurious gravity waves from model initial conditions?
Answer: A
Initialisation adjusts the analysed fields so that they satisfy an appropriate balance condition, preventing the excitation of large amplitude gravity waves at the start of the integration. Modern systems achieve this within the assimilation itself through incremental or digital filter techniques. Assimilation produces the analysis, output filtering is cosmetic, and ensembles address uncertainty rather than imbalance.
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