Half the ocean’s warming has come in the last couple decades

(credit: Jeffrey)

Over 90 percent of the heat energy added to Earth’s climate system by human activities has gone into the ocean, in part because, well, it's awfully big.

That awful-bigness makes monitoring all that heat energy a real challenge. A new study led by Peter Gleckler and Paul Durack at Lawrence Livermore National Laboratory compiled as much data as possible and compared it to climate model simulations. The comparison not only shows that the ocean's warming can only be explained by human impacts (surprise!) but also highlights just how quickly global warming is occurring outside of our view.

Although a large number of automated floats have been measuring temperatures in the upper 2,000 meters of the ocean for over a decade now, ship-based measurements from the past are more sparse. And the deeper the water, the fewer the available measurements. Because of this, studies analyzing the cause of ocean temperature changes have mainly stuck to the upper 700 meters. For this study, the researchers pulled together some more data—including the Challenger Expedition from the 1870s—in order to make deep ocean comparisons more worthwhile.

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