Discussion
Assertion (A): Seasonal climate forecasting relies on the persistence of sea surface temperature anomalies.
Reason (R): The ocean retains an anomaly for months while the atmosphere forgets its state within a fortnight.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the basis of the practice. The atmosphere loses memory of its state within about a fortnight, which is why weather forecasts have that horizon. The ocean’s enormous heat capacity holds a temperature anomaly for months, and because it forces the atmosphere above it, that persistence is the only source of skill a seasonal forecast has.
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