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Where is Global Warmimg Going?

Posted By: C-lo
Date: Wednesday, 8-October-2014 17:30:57


Oceans Are Getting Hotter than Anybody Realized

The upper 2,300 feet of the Southern Hemisphere’s oceans may have warmed twice as quickly after 1970 than had previously been thought, committing Earth to a warmer climate

By John Upton and Climate Central

89F9D5A2-D4A4-4113-89DDBDC877726825_articleThe RV Kaharoa motored out of Wellington, New Zealand on October 4, loaded with more than 100 scientific instruments, each eventually destined for a watery grave. Crewmembers will spend the next two months dropping the 50-pound devices, called Argo floats, into the seas between New Zealand and Mauritius, off the coast of Madagascar. There, the instruments will sink and drift, then measure temperature, salinity and pressure as they resurface to beam the data to a satellite. The battery-powered floats will repeat that process every 10 days — until they conk out, after four years or more, and become ocean junk.

Under an international program begun in 2000, and that started producing useful global data in 2005, the world’s warming and acidifying seas have been invisibly filled with thousands of these bobbing instruments. They are gathering and transmitting data that’s providing scientists with the clearest-ever pictures of the hitherto-unfathomed extent of ocean warming. About 90 percent of global warming is ending up not on land, but in the oceans.

Research published Sunday concluded that the upper 2,300 feet of the Southern Hemisphere’s oceans may have warmed twice as quickly after 1970 than had previously been thought. Gathering reliable ocean data in the Southern Hemisphere has historically been a challenge, given its remoteness and its relative paucity of commercial shipping, which helps gather ocean data. Argo floats and satellites are now helping to plug Austral ocean data gaps, and improving the accuracy of Northern Hemisphere measurements and estimates.

“The Argo data is really critical,” said Paul Durack, a Lawrence Livermore National Laboratory researcher who led the new study, which was published in Climate Nature Change. “The estimates that we had up until now have been pretty systematically underestimating the likely changes.”

Durack and Lawrence Livermore colleagues worked with a Jet Propulsion Laboratory scientist to compare ocean observations with ocean models. They concluded that the upper levels of the planet’s oceans — those of the northern and southern hemispheres combined — had been warming during several decades prior to 2005 at rates that were 24 to 58 percent faster than had previously been realized.

That rapid ocean warming has consequences for the Earth’s climate and its shorelines.

“We continue to be stunned at how rapidly the ocean is warming,” said Sarah Gille, a Scripps Institution of Oceanography professor. Gille was not involved with this paper, nor was she involved with a similar one published Sunday that examined the role of ocean warming in rising sea levels. She described both of them as “tremendously interesting” studies.

“Even if we stopped all greenhouse gas emissions today, we’d still have an ocean that is warmer than the ocean of 1950, and that heat commits us to a warmer climate,” Gille said. “Extra heat means extra sea level rise, since warmer water is less dense, so a warmer ocean expands.”

Ocean warming is exacerbating flooding caused by the melting of glaciers and other ice. Seas have risen 8 inches since the industrial revolution, and they continue to rise at a hastening pace, worsening floods and boosting storm surges near shorelines around the world. Another 2 to 7 feet of sea level rise is forecast this century, jeoparizing the homes and neighborhoods of the 5 million Americans who live less than 4 feet above high tide, as well as those of the hundreds of millions living along coastlines in other countries.

The other ocean temperature study, also published Sunday in Climate Nature Change, used Argo and other data to tentatively conclude that all of the ocean warming from 2005 to 2013 had occurred above depths of 6,500 feet. During the same period, the Jet Propulsion Laboratory scientists who wrote the paper concluded, the expansion of those warming waters caused a third of the planet’s 2.8 millimeters of annual sea-level rise.

Sunday’s papers joined more than 1,000 others published so far that have used Argo float data to improve science’s understanding of waterways that are climatically influential but difficult to measure manually. “This research covers a very broad range of topics including ocean circulation, water mass formation and spreading, mesoscale eddies, interannual variability such as El Niño, decadal variability, and multi-decadal climate change,” said Scripps Institution of Oceanography professor Dean Roemmich, who was in New Zealand last week preparing Argo floats for deployment by the RV Kaharoa’s crew. “The program has revolutionized large-scale physical oceanography.”

Steve Rintoul, a researcher at Australia’s Commonwealth Scientific and Industrial Research Organisation, or CSIRO, said findings of ocean warming above 6,500 feet in the Jet Propulsion Lab’s study explain the recent slowdown in warming at the Earth’s surface, which is sometimes called global warming hiatus, or warming pause.

“An important result of this paper is the demonstration that the oceans have continued to warm over the past decade, at a rate consistent with estimates of Earth’s net energy imbalance,” Rintoul said. “While the rate of increase in surface air temperatures slowed in the last 10 to 15 years, the heat stored by the planet, which is heavily dominated by the oceans, has steadily increased as greenhouse gases have continued to rise.”

That extra heat isn’t expected to swim with the fishes forever. Some of it will eventually rise from the deep, raising temperatures in places that more directly affect us landlubbers.

Just how rapidly the oceanic heat will resurface to warm the land is “something that we struggle with,” said Scripps’s Gille. But she said heat is constantly shifting between oceans and the atmosphere. “A warmer ocean will mean a warmer atmosphere.”

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