"At the end of Spencer's careful analysis, a simple picture emerges. The PDO is a long-lived ocean-to-atmosphere heat transfer process (similar to the better-known El Niño and La Niña) but of much longer duration. Cloud cover decreases significantly during the positive PDO phase, allowing more sunlight to reach the earth's surface. In the ocean, this extra energy is stored as heat. In its negative phase, the PDO acts in reverse and cools the atmosphere. And all of this occurs in roughly thirty-year cycles. While this mechanism is operating, mankind is dumping a small, vanishing amount of CO2 into the atmosphere. Big deal."
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