Atlantic Slows Warming, Temperature Rises Seen Resuming from 2030

Posted by Eric Haun
Thursday, August 21, 2014

The Atlantic Ocean has masked global warming this century by soaking up vast amounts of heat from the atmosphere in a shift likely to reverse from around 2030 and spur fast temperature rises, scientists said.

The theory is the latest explanation for a slowdown in the pace of warming at the Earth's surface since about 1998 that has puzzled experts because it conflicts with rising greenhouse gas emissions, especially from emerging economies led by China.

"We're pointing to the Atlantic as the driver of the hiatus," Ka-Kit Tung, of the University of Washington in Seattle and a co-author of Thursday's study in the journal Science, told Reuters.

The study said an Atlantic current carrying water north from the tropics sped up this century and sucked more warm surface waters down to 1,500 metres (5,000 feet), part of a natural shift for the ocean that typically lasts about three decades.

It said a return to a warmer period, releasing more heat stored in the ocean, was likely to start around 2030. When it does, "another episode of accelerated global warming should ensue", the authors wrote.

Almost 200 governments aim to agree a deal to combat climate change at a summit in Paris in late 2015 and the hiatus has heartened sceptics who doubt there is an urgent need for a trillion-dollar shift from fossil fuels to renewable energies.

Several previous studies have suggested that the larger Pacific Ocean is the likely site of the "missing heat" from man-made greenhouse gases, perhaps linked to a series of La Nina cooling events in the Pacific in recent years.

Other suggestions for the slowdown in warming have included a rise in industrial pollution that is blocking sunlight.

SHIFT IN SALINITY?

A separate team of scientists writing in the journal Nature Geoscience on Sunday said that factors including swings in the sun's output and sun-blocking dust from volcanic eruptions may account for gaps in understanding the warming trends.

In addition, La Nina cooling events in the Pacific Ocean had played a role, according to the report that examined why computer models of the climate had over-estimated temperature rises in the past decade.

But no one knows for sure.

"It will be interesting to see how and if these ideas are connected" with the theory of the Atlantic, lead author Markus Huber said of the study by the Institute for Atmospheric and Climate Science at ETH Zurich.

Thursday's study said a shift in salinity may have caused more heat to be transferred to the depths of the Atlantic.

Warm, salty water from the tropics flows north on the Gulf Stream in the Atlantic and sinks when it meets cooler water. The "great ocean conveyor belt" then makes cold water flow in the depths to the Southern Ocean.

Even though global warming has slowed, 13 of the 14 warmest years on record have been this century, according to U.N. estimates.

A U.N. panel says it is at least 95 percent certain that human emissions, rather than natural variations in the climate, are the main cause of rising temperatures since 1960 that have caused more heatwaves, downpours and rising sea levels.

(By Alister Doyle; Editing by Gareth Jones)

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

NZ Report: Human Error to Blame for Rena Grounding

New Zealand's Transport Accident Investigation Commission (TAIC) published its final report into the grounding of containership Rena in October 2011. The TAIC’s

Costa Rica Approves APM Terminals Project

Port operator APM Terminals, a unit of Denmark's A.P. Moller-Maersk, said on Friday Costa Rica's environment agency had approved the construction of its Moin Container Terminal project.

NOAA: US to See More Floods from Sea Level Rise

Most of U.S. coast may see 30 or more days a year of floods up to 2 feet above high tides. By 2050, a majority of U.S. coastal areas are likely to be threatened

News

Port Workers in Argentine Grain Hub End Strike

Port workers in part of the Argentine grains hub of Rosario lifted a work stoppage on Friday, only a day after they went on strike over demands for higher year-end bonuses, a union official said.

Madsen to Chair Norway’s Research Council Executive Board

Henrik O. Madsen appointed chairman of the executive board of the Research Council of Norway   DNV GL president and CEO Henrik O. Madsen was appointed as chairman

Larger Tankers May Offer Better Return Chances

Investors looking for returns in the tanker markets can invest their capital in a variety of ways. Should an owner invest in a VLCC or an Aframax? How about an

Marine Science

NOAA: US to See More Floods from Sea Level Rise

Most of U.S. coast may see 30 or more days a year of floods up to 2 feet above high tides. By 2050, a majority of U.S. coastal areas are likely to be threatened

Damen Shipyards Galati wins Dutch Romanian Award

Damen Shipyards Galati has been presented with the Dutch Romanian Business Award for its Corporate Social Responsibility plan, particularly the Group’s community investment initiatives.

Lowrance Renews Insight Genesis College Cup

Lowrance®, a world-leading brand in fishing electronics since 1957— announced today the renewal of its Insight Genesis™ College Cup. In its second year, the

Ocean Observation

NOAA: US to See More Floods from Sea Level Rise

Most of U.S. coast may see 30 or more days a year of floods up to 2 feet above high tides. By 2050, a majority of U.S. coastal areas are likely to be threatened

DYT Yacht Transport Carries M/V OCEARCH

The 126-foot research vessel M/V OCEARCH is currently making its way from Port Everglades, Florida to Brisbane, Australia on board DYT Yacht Transport’s semisubmersible

Talisman Sinopec Closes North Sea Platform Ahead of Storm

Talisman Sinopec Energy UK has closed its Buchan Alpha platform in the North Sea, the company said on Wednesday, ahead of an expected severe winter storm. The

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Navigation Pod Propulsion Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1500 sec (7 req/sec)