2019 SkS Weekly Climate Change & Global Warming News Roundup #5

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Climate Hustle

Posted on 2 February 2019 by John Hartz

A chronological listing of news articles posted on the Skeptical Science Facebook Page during the past week, i.e., Sun, Jan 27 through Sat, Feb 2, 2019

Editor’s Pick

A surprising new picture of ocean circulation could have major consequences for climate science

Some experts say the Atlantic Ocean circulation is already slowing down — but we’re just beginning to learn how it really works.

Atlantic Ocean at Southern Tip of Greenland 

The ocean near the southern tip of Greenland during a cruise to deploy the initial OSNAP array. (Photo Credit: C. Nobre/Woods Hole Oceanographic Institution.)

It may be the biggest wild card in the climate system. Scientists have long feared that the so-called “overturning” circulation in the Atlantic Ocean could slow down or even halt due to climate change — a change that would have enormous planetary consequences.

But at the same time, researchers have a limited understanding of how the circulation actually works, since taking measurements of its vast and remote currents is exceedingly difficult. And now, a major new research endeavor aimed at doing just that has suggested a dramatic revision of our understanding of the circulation itself.

A new 21-month series of observations in the frigid waters off Greenland has led to the discovery that most of the overturning — in which water not only sinks but returns southward again in the ocean depths — occurs to the east, rather than to the west, of the enormous ice island. If that’s correct, then climate models that suggest the circulation will slow as the climate warms may have to be revised to take this into account.

A surprising new picture of ocean circulation could have major consequences for climate science by Chris Mooney, Washington Post, Jan 31, 2019

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