Discussion
Which advantage does vorticity have over the height field for tracking features?
Answer: B
Because vorticity is the Laplacian of the streamfunction, taking it amplifies short wavelengths, so weak short wave troughs invisible in the height field stand out clearly. That same amplification makes vorticity fields noisier rather than smoother, which is the price paid. Neither field is measured directly and vorticity takes both signs, so the other options are simply wrong.
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