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Latest Chemical oceanography Stories

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2010-03-24 11:12:55

Some regions of the deep ocean floor support abundant populations of organisms, despite being overlain by water that contains very little oxygen, according to an international study led by scientists at the United Kingdom's National Oceanography Center, Southampton. But global warming is likely to exacerbate oxygen depletion and thereby reduce biodiversity in these regions, they warn. The sunlit surface waters tend to be well oxygenated as a result of their connection with the atmosphere....

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2010-03-12 08:42:24

As oxygen-deprived waters increase, they emit more greenhouse gasses into atmosphere The increased frequency and intensity of oxygen-deprived "dead zones" along the world's coasts can negatively impact environmental conditions in far more than just local waters. In the March 12 edition of the journal Science, University of Maryland Center for Environmental Science oceanographer Dr. Lou Codispoti explains that the increased amount of nitrous oxide (N2O) produced in low-oxygen (hypoxic) waters...

2010-03-08 12:57:39

Acantharian cyst sedimentation Spore-like reproductive cysts of enigmatic organisms called acantharians rapidly sink from surface waters to the deep ocean in certain regions, according to new research. Scientists suspect that this is part of an extraordinary reproductive strategy, which allows juveniles to exploit a seasonal food bonanza. The research shows that deep sedimentation of cysts during the spring delivers significant amounts of organic matter to the ocean depths, providing a...

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2010-02-16 16:39:50

Two studies provide clearer picture of how carbon cycle was dramatically affected long ago Geoengineering -- deliberate manipulation of the Earth's climate to slow or reverse global warming -- has gained a foothold in the climate change discussion. But before effective action can be taken, the Earth's natural biogeochemical cycles must be better understood. Two Northwestern University studies, both published online recently by Nature Geoscience, contribute new -- and related -- clues as to...

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2010-02-05 13:56:54

The chemical composition of our oceans is not constant but has varied significantly over geological time. In a study published this week in Science, researchers describe a novel method for reconstructing past ocean chemistry using calcium carbonate veins that precipitate from seawater-derived fluids in rocks beneath the seafloor. The research was led by scientists from the University of Southampton's School of Ocean and Earth Science (SOES) hosted at the National Oceanography Centre,...

2010-02-04 14:29:09

The increasing acidity of the world's oceans - and that acidity's growing threat to marine species - are definitive proof that the atmospheric carbon dioxide that is causing climate change is also negatively affecting the marine environment, says world-renowned Antarctic marine biologist Jim McClintock, Ph.D., professor in the University of Alabama at Birmingham (UAB) Department of Biology. "The oceans are a sink for the carbon dioxide that is released into the atmosphere," says McClintock,...

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2010-01-08 13:22:59

The impact on levels of carbon dioxide in the Earth's atmosphere by the decaying remains of a group of marine creatures that includes starfish and sea urchin has been significantly underestimated. "Climate models must take this carbon sink into account," says Mario Lebrato, lead author of the study. The work was done when he was at the National Oceanography Centre, Southampton (NOCS) and affiliated with the University of Southampton's School of Ocean and Earth Science (SOES); he is now at the...

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2009-12-22 10:54:03

There is little doubt among scientists now that human carbon dioxide emissions are warming the planet. Another problem of rising atmospheric carbon dioxide (CO2) is that CO2 is being absorbed by the oceans, which increases seawater acidity (lowers the seawater pH). This process, termed 'ocean acidification', has received growing scientific and public interest because it threatens certain groups of marine organisms, including corals. Only recently have researchers realized that man-made carbon...

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2009-12-21 06:50:39

A study published by U.S. scientists on Sunday said pollution has caused the world's oceans to become noisier, causing more harmful effects to whales, dolphins, and other marine life. These effects include death and serious injury caused by brain hemorrhages or other tissue trauma, strandings and beachings, temporary and permanent hearing loss or impairment, displacement from preferred habitat and disruption of feeding, breeding, nursing, communication, sensing and other behaviors vital to...

2009-12-15 22:21:15

A new study of Pacific Ocean sediments off the coast of Chile has found that  offshore waters experienced systematic oxygen depletion during the rapid warming of the Antarctic following the last "glacial maximum" period 20,000 years ago. The findings are intriguing as scientists are exploring whether climate change may be contributing to outbreaks of hypoxia "“ or extremely low oxygen levels "“ along the near-shore regions of South America and the Pacific Northwest of the...


Latest Chemical oceanography Reference Libraries

Ocean Acidification
2013-04-01 10:32:20

Ocean acidification is the name that was given to the ongoing decrease in the pH of Earth’s oceans, a cause of the uptake of anthropogenic carbon dioxide from the atmosphere. About 30 to 40 percent of the carbon dioxide that is released by humans into the atmosphere dissolves into the lakes, oceans, and rivers. To maintain the chemical equilibrium, some of it reacts with the water to create carbonic acid. Some of these extra carbonic acid molecules react with a water molecule to provide a...

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