Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

‘Short-circuit’ discovered in ocean circulation

14.05.2007
Scientists have discovered how ocean circulation is working in the current that flows around Antarctica by tracing the path of helium from underwater volcanoes. The details are published in Nature this week.

The team, led by Dr Alberto Naveira Garabato of the University of Southampton's School of Ocean and Earth Science and the National Oceanography Centre, Southampton, has found a 'short-circuit' in the circulation of the world's oceans that could aid predictions about future climate change.

This process in the Southern Ocean allows cold waters that sink to the abyss to return to the surface more rapidly than previously thought.

This affects the Southern Ocean circulation, which links all the other oceans, and is also relevant to uptake and release of carbon dioxide by the sea – transport between the deep and surface waters in the Southern Ocean is particularly important for this process.

Understanding oceanic circulation is important because it distributes heat, carbon and nutrients around the globe and therefore plays a central role in regulating Earth's climate.

The findings show that much of the overturning circulation - how water moves and mixes vertically - around Antarctica takes place just around the tip of South America and in the small region in the Atlantic south of the Falklands, called the Scotia Sea.

Co-author Prof Andrew Watson, from the University of East Anglia’s School of Environmental Sciences, said they were fundamental findings.

“The Southern Ocean is the least well understood part of the world ocean, but one of the most important parts. We are going to have to understand its circulation before we can make really confident predictions about how the climate is going to change over the next 100 years.

“This is a piece of knowledge that will help us do that. This tells us how an important part of it works”

Dr Naveira Garabato said they represented an important shift in how scientists think that the ocean circulation is driven.

"For many years, oceanographers have regarded the circulation in the upper kilometre of the ocean as being independent of that in the abyss. Our observations show that the two are very much intertwined in the Southern Ocean, and that this has substantial implications for how we represent the ocean in climate models."

The research shows that a combination of rapid mixing across and rapid movement along density surfaces creates a 'short-circuit' in the overturning circulation, meaning it is more concentrated in this part of the Southern Ocean.

The researchers made use of a unique signal - the spread of helium released naturally from the Earth’s interior at deep vents in the Pacific. The helium dissolves in the deep sea and a plume of this marked water travels down the coast of Chile. It is injected at depth into the Antarctic current on the Pacific side of Cape Horn.

It then streams through into the Atlantic with the current, but in the process is spread, shifted and diffused by the circulation. Measurements of this spreading of the helium were used to deduce the ‘short-circuit’.

Dr David Stevens, from UEA’s School of Mathematics, and Wolfgang Roether, from the University of Bremen, Germany, are also co-authors.

Press Office | alfa
Further information:
http://comm.uea.ac.uk/press/release.asp?id=752

More articles from Earth Sciences:

nachricht New Study Will Help Find the Best Locations for Thermal Power Stations in Iceland
19.01.2017 | University of Gothenburg

nachricht Water - as the underlying driver of the Earth’s carbon cycle
17.01.2017 | Max-Planck-Institut für Biogeochemie

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

The interactome of infected neural cells reveals new therapeutic targets for Zika

23.01.2017 | Life Sciences

Melting solid below the freezing point

23.01.2017 | Materials Sciences

Helmholtz International Fellow Award for Sarah Amalia Teichmann

20.01.2017 | Awards Funding

VideoLinks
B2B-VideoLinks
More VideoLinks >>>