Discussion
Assertion (A): Ocean heat content is a better indicator of the planetary energy imbalance than surface temperature.
Reason (R): Most of the excess energy goes into the ocean, and its heat content is far less noisy than the surface record.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives both halves. Over ninety per cent of the excess energy accumulating in the system goes into the ocean, so ocean heat content measures the imbalance directly rather than one of its consequences. And because water has an enormous heat capacity and the ocean is not stirred by weather in the way the surface air is, the record is far smoother - it shows no hiatus where the surface record does.
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