News / Science & Technology

    Global Warming Slowdown Trapped in Ocean

    General view of beach shows breaking waves along the ocean beach front in Biarritz on the southern Atlantic Coast of France, Feb. 6, 2014. Global warming is in a temporary hiatus, in part because of heat absorbed deep into the Atlantic and Southern oceans.
    General view of beach shows breaking waves along the ocean beach front in Biarritz on the southern Atlantic Coast of France, Feb. 6, 2014. Global warming is in a temporary hiatus, in part because of heat absorbed deep into the Atlantic and Southern oceans.
    Rosanne Skirble

    A climate change mystery is coming into sharper focus.

    A new study released in the journal Science explains why despite the rise of heat-trapping gases in the atmosphere, global warming has slowed over the last 15 years. Some scientists point to the cooling effect of volcanoes or changes in solar activity.  

    Lead author and University of Washington applied mathematics professor Ka Kit Tung suggests massive movement of heat from shallow to deep regions of the ocean is responsible.

    “From the energy standpoint, the warming does not just warm the surface. It should warm the whole ocean column," said Tung. "There is evidence that the integrated temperature of the whole ocean column has been increasing even through the current period of pause.”

    Global warming heat stored in Atlantic, Southern oceans

    Ninety-three percent of the excess heat caused by global warming gases is stored in the oceans. Tung used underwater sensors to measure the temperature at various depths in the water column over the last three decades of the 20th century. Climate models indicated that the Pacific Ocean was hiding the heat.

    But observations showed the heat is sinking deep in the Atlantic and Southern Oceans, part of a natural 30-year cycle. Tung said the current phase, with cooler temperatures at the ocean surface, started in 1999 when the rapid warming of the last century slowed down. “And we are currently in the middle of this 30-year period where more heat is going into the ocean, Tung said, “That’s why what [heat] remains near the surface has not been much, not much warming.”    

    Salty seawater triggers heat migration into ocean depth

    Tung's study finds that the excessive heat now stored in the ocean depths moves like a conveyor belt between the north and south poles. The warm water becomes saltier as it travels through the subtropics because there is more evaporation of surface water at those latitudes.

    Salty seawater is heavier and sinks, making the sea surface - and the air above it - cooler. Tung said that accounts for the warming pause we’re experiencing now. Temperatures will rise, however, when the ocean cycle flips to its warm phase. “The rate of surface temperature increase will be just as high, or even higher, than what we experienced in the last three decades of the 20th century. But the actual temperature that it starts with is now the highest temperature, but it is going to go up very rapidly. So the next phase of accelerated warming is going to be very damaging.”

    The current global warming slowdown, Tung predicts, could last a decade or longer.

     

     

    You May Like

    Video London’s Financial Crown at Risk as Rivals Eye Brexit Opportunities

    City could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters

    Turkey Aims New Crackdown at Journalists, Academics, Airline Workers

    Ankara continues targeting people allegedly linked to exiled cleric, who it says led the failed military coup

    Pakistan Ready to Inaugurate Rebuilt Afghan Border Crossing

    Construction of Torkham Gate triggered deadly clashes between Pakistani and Afghan military forces

    This forum has been closed.
    Comment Sorting
    Comments
         
    by: Science Officer from: Earth
    August 22, 2014 1:59 PM
    Odd, the rate of sea level rise has slowed, commensurate with the "pause" in atmospheric temperatures. You'd think all the heat in the oceans would make them expand and sea levels would rise faster. Now we have another mystery to solve

    by: Asok Smith
    August 21, 2014 10:07 PM
    I'm confused. I thought the "science" was settled.
    In Response

    by: Terry from: Western us
    August 23, 2014 2:39 AM
    I get tired of hearing the debate about climate change is settled. No "theory" that continually does not produce the projected results is settled. Every time things don't go the way the alarmists project they produce another theory as to why. They said themselves in this report that the earth goes through cycles of temperature fluctuation that can last up to 70 years. That meanes the last 100 years of warming, minus the last 15 years it didn't warm could be a natural cycle. We need to be good stewards of our planet but not destroy our economy based on unproven theory.
    In Response

    by: ReduceGHGs from: Oregon
    August 22, 2014 11:08 AM
    The science regarding the core issue is settled; Humans are warming the planet and the consequences are not good. To avoid confusion read what the experts have been saying for years. Google: NASA Climate Change Consensus

    by: BigBob from: USA
    August 21, 2014 9:13 PM
    The big run-away green house is just a scare tactic to scare dumb weak minded folk to vote for surrendering extremely large amounts of tax money to greedy university profs. and other dishonest government officials. If you only knew the funds these greedy swindlers took in. Don’t forget crony capitalism like Solarendra and GE. Have a big green time while they suck green dollars from your pockets. One of the heads of IPCC Dr. Michael Mann and colleagues had all their top secret emails flooded into public domain where all could see the giant scam. You would think it would have been the end of the issue. But no! Way too much money to be made yet. Liberals run the government and liberals almost never indict fellow liberals. That’s because they are all a bunch of hippy crooks! You don't think I have proof ? Where has the social security funds gone to?

    Featured Videos

    Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
    London’s Financial Crown at Risk as Rivals Eye Brexit Opportunitiesi
    X
    VOA News
    July 25, 2016 5:09 PM
    By most measures, London rivals New York as the only true global financial center. But Britain’s vote to leave the European Union – so-called ‘Brexit’ – means the city could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters. Already some banks have said they may shift operations to the mainland. Henry Ridgwell reports from London.
    Video

    Video London’s Financial Crown at Risk as Rivals Eye Brexit Opportunities

    By most measures, London rivals New York as the only true global financial center. But Britain’s vote to leave the European Union – so-called ‘Brexit’ – means the city could lose its right to sell services tariff-free across the bloc, risking its position as Europe’s financial headquarters. Already some banks have said they may shift operations to the mainland. Henry Ridgwell reports from London.
    Video

    Video Recycling Lifeline for Lebanon’s Last Glassblowers

    In a small Lebanese coastal town, one family is preserving a craft that stretches back millennia. The art of glass blowing was developed by Phoenicians in the region, and the Khalifehs say they are the only ones keeping the skill alive in Lebanon. But despite teaming up with an eco-entrepreneur and receiving an unexpected boost from the country’s recent trash crisis the future remains uncertain. John Owens reports from Sarafand.
    Video

    Video Migrants Continue to Risk Lives Crossing US Border from Mexico

    In his speech Thursday before the Republican National Convention, the party’s presidential candidate, Donald Trump, reiterated his proposal to build a wall along the U.S.-Mexico border if elected. Polls show a large percentage of Americans support better control of the nation's southwestern border, but as VOA’s Greg Flakus reports from the border town of Nogales in the Mexican state of Sonora, the situation faced by people trying to cross the border is already daunting.
    Video

    Video In State of Emergency, Turkey’s Erdogan Focuses on Spiritual Movement

    The state of emergency that Turkish President Recep Tayyip Erdogan has declared is giving him even more power to expand a purge that has seen an estimated 60,000 people either arrested or suspended from their jobs. VOA Europe correspondent Luis Ramirez reports from Istanbul.
    Video

    Video Calm the Waters: US Doubles Down Diplomatic Efforts in ASEAN Meetings

    The United States is redoubling diplomatic efforts and looking to upcoming regional meetings to calm the waters after an international tribunal invalidated the legal basis of Beijing's extensive claims in the South China Sea. VOA State Department correspondent Nike Ching has the story.
    Video

    Video Four Brother Goats Arrive in Brooklyn on a Mission

    While it's unusual to see farm animals in cities, it's become familiar for residents of Brooklyn, New York, to see a little herd of goats. Unlike gas-powered mowing equipment, goats remove invasive weeds quietly and without adding more pollution to the air. As Faiza Elmasry tells us, this is a pilot program and if it proves to be successful, the goat gardener program will be extended to other areas of New York. Faith Lapidus narrates.
    Video

    Video Scientists in Poland Race to Save Honeybees

    Honeybees are in danger worldwide. Causes of what's known as colony collapse disorder range from pesticides and loss of habitat to infections. But scientists in Poland say they are on track to finding a cure for one of the diseases. VOA’s George Putic reports.
    Video

    Video Wall Already Runs Along Parts of US-Mexico Border

    The Republican Party’s presidential nominee, Donald Trump, gained the support of many voters by saying he would build a wall to keep undocumented immigrants and drugs from coming across the border from Mexico. Critics have called his idea impractical and offensive to Mexico, while supporters say such a bold approach is needed to control the border. VOA’s Greg Flakus has more from the border town of Nogales, Arizona.
    Video

    Video New HIV Tests Emphasize Rapid Results

    As the global fight against AIDS intensifies, activists have placed increasing importance on getting people to know their HIV status. Some companies are developing new HIV testing methods designed to be quick, easy and accurate. Thuso Khumalo looks at the latest methods, presented at the International AIDS conference in Durban, South Africa.
    Video

    Video African Youth with HIV Urge More Support

    HIV, the virus that causes AIDS, is the top killer of teens in sub-Saharan Africa. But many youths say their experience with the virus is unique and needs to be addressed differently than the adult epidemic. VOA South African Correspondent Anita Powell reports.
    Video

    Video Pop-Up Art Comes to Your Living Room, Backyard and Elsewhere

    Around the world, independent artists and musicians wrestle with a common problem: where to exhibit or perform? Traditional spaces such as museums and galleries are reserved for bigger names, and renting a space is not feasible for many. Enter ArtsUp, which connects artists with venue owners. Whether it’s a living room, restaurant, office or even a boat, pop-up events are bringing music and art to unexpected places. Tina Trinh has more.
    Video

    Video Scotland’s Booming Whisky Industry Fears Brexit Hangover

    After Britain’s vote to leave the European Union, Scotland’s government wants to break away from the United Kingdom – fearing the nation’s exports are at risk. Among the biggest of these is whisky. Henry Ridgwell reports on a time of turmoil for those involved in the ancient art of distilling Scotland’s most famous product.

    Special Report

    Adrift The Invisible African Diaspora