Arctic climate is regulated by an intricate series of interconnected mechanisms that shift winds, ice, currents, and other conditions. In the recent past, the Arctic had reliably shifted between high-pressure clockwise (top) and low-pressure counterclockwise (bottom) wind-driven circulation regimes. But global warming may be causing the system to stick longer in the clockwise high-pressure mode. (Illustration by Eric S. Taylor, © Woods Hole Oceanographic Institution)
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