Research hints at tipping point in the Atlantic’s currents

Enlarge / Preparing to monitor conditions in the Imringer Sea. (credit: National Science Foundation)

All of the world’s oceans have a similar pattern of currents. Surface waters warm near the equator, then flow toward the poles, where they cool and sink. The cold, dense bottom water makes its way south to restart the cycle. This pattern has particular significance in the North Atlantic, where the flow of warm surface water helps moderate the climate of Northern Europe, parts of which might otherwise resemble Greenland.

A lot of people have pondered whether the warming induced by climate change could interfere with this conveyer belt, preventing the water that nears the Arctic from cooling and sinking. Most analyses, however, suggest that this could only happen after the world had warmed enough that Europe wouldn’t need the currents to moderate its temperature.

A new study, however, suggests that there’s a tipping point for the Atlantic conveyer that could be reached much sooner. It only relies indirectly on warm temperatures; instead, it’s driven by the melting of the Greenland ice cap. And the new research suggests we’ve already gone nearly halfway to the tipping point.

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Source: FS – All – Science – News
Research hints at tipping point in the Atlantic’s currents