Menu
Scientific news and articles
Male pipefish decide who survives
Saturn's rings a chaotic clutter
Researchers develop desal on a chip
Final missing piece of insulin lock found
Volcano helped dinosaurs gain upper hand
Bouncing current could speed up charge
Bleaching leaves Lord Howe reef 'on knife edge'
Floor price for booze good as taxes, study
Concerns over varroa mite resistance
Microbes breathe life into oxygen theory
Pre-history rewritten as new human discovered
Dung beetle claims strongest insect title
Scientists unearth Australian tyrannosaur
Splitting cyclone reveals Neptune's nature
Junk food can become addictive: study
Bumblebees have superfast colour vision
Black holes may be 'missing dark matter'
Magnets can manipulate morality: study
Sun helps bats find home in the dark
LHC to begin 'Big Bang' project
Trial of bionic eye within three years
Easter eggs may be good for your heart
Mega-flood triggered European ice age
Finch genome music to researcher's ears
Scientists measure massive ocean current
Scientists have measured the most powerful current that helps drive the circulation of the Southern Ocean, paving the way for more accurate climate models.

Australian oceanographer Dr Steve Rintoul, of the Centre for Australian Weather and Climate Research in Hobart, and colleagues, report on the current today in Nature Geoscience.

"The current carries about 8 million cubic metres per second of water to the north and that's about the equivalent 40 times the flow of the world's largest river," says Rintoul.

Scientists have known there are three currents that transport water from Antarctica towards the equator.

These currents are driven by cold oxygen-rich water that sinks to the deep ocean at Antarctica, and flows northwards.

"This current that we've measured is part of a global pattern of ocean currents, which we often call the 'overturning circulation' or sometimes the 'ocean conveyor belt'," says Rintoul.

Such currents are important in revitalising the oceans with oxygen. They also affect the climate system because they determine how much heat and CO2 are stored and transported by the ocean.

The slower the current the less heat and carbon dioxide they can transport.

The current measured by Rintoul and colleagues flows at about a depth of about 4 kilometres, along the coast of Antarctica from Ross and Adelie before heading north around the edge of the Kerguelen Plateau, which supports Herd Island.

It flows at an average speed of 22 centimetres per second, which is 10 to 20 times larger than the greatest average speeds ever measured in water of this depth, says Rintoul.
Climate models

Rintoul says the new measurements will serve as a "benchmark" by which global climate models can be fine-tuned.

"Climate models will need to reproduce this current if they're going to capture correctly how the ocean transports heat, and therefore be able to provide reliable climate predictions," he says.

Rintoul says that current climate models have assumed a much weaker current.

"A stronger overturning circulation would transport more heat from the lower latitudes towards the poles," he says.

But, Rintoul says it is not possible to tell how exactly inclusion of these updated figures will impact on climate because of the complexity of the climate system.
Measurements

The researchers measured speed, salinity and temperature over a period of two years.

They used measuring devices attached to a 3-kilometre-long wire that was anchored to the ocean floor by old train wheels, along the path of the current.

Speed and salinity measurements helped them to identify the source of the currents in Antarctica.

Salinity measurements will also help to verify other scant data suggesting that oceans have become less salty since 1970s.

As water becomes less salty it becomes less dense and is less likely to sink, slowing down the currents, says Rintoul.

Print
New Zealand's GM livestock given reprieve
Nano diamonds to become a doctor's best friend
Ocean saltiness reaching new limits
Volcanic ash unlikely to cool planet
Silk forms 'intimate' brain connection
New drug improves hepatitis C outcome
Microbial life discovered in asphalt lake
Green tea may strengthen your teeth
Head-ramming dino had 'gears' in skull
Clever crows show innovative behaviour
Research casts doubt on brain training
Multiple unknowns cloud volcano's impact
Staying fit helps men 'do it longer'
Copenhagen sets Earth for more warming
Solar spacecraft begins study of our Sun
Mixed messages on gene patenting
Gene study finds multiple species of orca
Dreaming boosts learning and creativity
Scientists measure massive ocean current
Genes influence smoking addiction: study
Nanowires create volts of electricity
Fisheries urged to diversify their 'take'
Chimps confront death in human-like ways
Chile to host world's biggest telescope
Trapping light to improve solar cells
Experts debate use of HPV test
Japan to launch 'space yacht'
Sea ice loss key to Arctic warming, study
Menu
Australian lasers to track orbiting junk
Thawing nitrous oxide overlooked: study
'Sound bullets' could blast cancer
Lasers could spark clean nuclear power
Seaweed slows black sea snakes down
Asteroid impacts cause crustal crisis: study
Flu jab link to increased H1N1 risk: study
Intestinal germ helps sushi digestion
Researcher closes in on freezing conundrum
Test identifies smokers at highest risk
New species of human found in 'death trap'
'Planet of love' still hot and active
Stress takes its toll on tiny lizard
Scientists record world's tiniest nudge
Cell signals shed light on breast cancer
Parasites behind seasonal allergies
Study finds maternal deaths falling
Pluto's family set to grow tenfold
Diet cuts Alzheimer's risk: study
Whales get physical when seas get rough
'Tweets' could warn of future epidemics
Quolls force-fed toads in survival fight
Researchers question use of silver dressings
Scientists create truly random numbers
Visit Statistics
http://google.com/

http://bing.com/

https://gepatit-info.top/

https://serdechnic.com/

https://buy-meds24.com/

https://dverirespekt.ru/

https://www.sribno.net/

https://undergroundcityphoto.com/

https://detskiezabolevaniya.com/

http://grafaman.ru/

http://innoslicon.com/html/product/index.htm

https://yginekologa.com/

https://yes-com.com/

https://www.baikaleminer.com/

https://bitmaein.com/shop

https://www.artdeko.info/

https://aerodizain.com/

http://xn--d1abj0abs9d.in.ua/

http://lider82.ru/

http://sta-grand.ru/

http://snabs.kz/

https://sky-mine.ru/

https://rybalka-opt.ru/

http://snegozaderzhatel.ru/

https://xn--e1aaajzchnkg.ru.com/

http://hit-kino.ru/

http://www.regionshop.biz/

https://xn--80aaafbn2bc2ahdfrfkln6l.xn--p1ai/

https://pp-budpostach.com.ua/

https://vykup-avto-krasnodar.ru/

https://gcup.ru/

https://mega-polis.biz.ua/

http://vanrise.com.ua/

http://infra-e.ru/

https://veterinariya.com/

https://ponosanet.com/

https://cariestop.com/

https://proartrit.com/

https://elonm.ru/

https://nakozhe.com/

https://spinanebolit.com/

http://zameskino.ru/

http://kinoprinc.ru/

http://pospektr.ru/

http://buypillsonline24h.com/

http://komputers-best.ru/

https://komp-pomosch.ru/