Discussion
Which numerical problem did unbalanced initial conditions cause historically?
Answer: B
Richardson's initial field contained a small imbalance whose gravity wave response dominated the computed pressure tendency, giving a change of 145 hectopascals in six hours. The episode led directly to the development of initialisation techniques and filtered equation sets. The other problems listed are genuine numerical difficulties but arose from quite different causes. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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