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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter July 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

Two DNV GL Approvals for GTT Training Software

GTT Training, a GTT subsidiary dedicated to training liquefied natural gas (LNG) professionals and to the development of associated simulation tools, has obtained

How to Avoid Claims for Self-cooking Cargo

North P&I Club has advised its members to be extra vigilant during loading and transport of soya beans to ensure they do not get blamed for cargoes that start ‘cooking’ at sea.

China sets up South China Sea environment protection fund

China has set up a 15 million yuan ($2.25 million) environmental protection fund for the South China Sea having already spent double that in the past four years,

News

Boeing 767 Shipped by Barge

MTS Statum completes marine towage of barge carrying Boeing 767 from Shannon Airport   Marine service provider Marine and Towage Services Group Ltd. (MTS) has

New Ferry MV Woods Hole Delivered

The newly built ferry M/V Woods Hole has been delivered to serve Woods Hole, Martha’s Vineyard and Nantucket.   Built by Conrad Industries of Morgan City, La.

New Details Emerge on Loss of USS Indianapolis

A Naval History and Heritage Command (NHHC) historian has recently uncovered information that sheds new light on the loss of the World War II cruiser USS Indianapolis (CA 35).

Marine Science

Canada Embarks on Arctic Survey Mission

Canada has launched its 2016 Arctic expedition to collect important scientific information to support the nation’s submission on the extended continental shelf in the Arctic Ocean.

Pathogenic bacteria hitchhiking to North and Baltic Seas?

For the first time, AWI scientists have found evidence of living, potentially pathogenic vibrions on microplastic particles. With increasing water temperatures

Ship Engine Emissions Adversely Affect Macrophages

A study conducted by Germany’s Helmholtz Zentrum München and University of Rostock found that ship emissions adversely affect the health of inhabitants of coastal regions.

Ocean Observation

Canada Embarks on Arctic Survey Mission

Canada has launched its 2016 Arctic expedition to collect important scientific information to support the nation’s submission on the extended continental shelf in the Arctic Ocean.

China’s One Belt, One Road: Will it Reshape Global Trade?

The future of trade in Asia could depend heavily on what becomes of China’s expansive One Belt, One Road initiative, which calls for massive investment in and

Pathogenic bacteria hitchhiking to North and Baltic Seas?

For the first time, AWI scientists have found evidence of living, potentially pathogenic vibrions on microplastic particles. With increasing water temperatures

 
 
Maritime Careers / Shipboard Positions Maritime Security Navigation Offshore Oil Pod Propulsion Port Authority Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | 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: 0.1730 sec (6 req/sec)