Discussion
Which technique removes such imbalance from a modern analysis?
Answer: C
A digital filter runs the model briefly forward and backward and applies a low pass filter in time, removing the high frequency gravity wave components while leaving the balanced flow untouched. Incremental analysis update achieves a similar result within the assimilation. Resolution and truncation do not address balance, and time averaging would smear the meteorological signal as well. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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