oceans

Wed, 2014-10-08 05:00Mike Gaworecki
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Experts Are "Stunned" By How Quickly Oceans Are Warming

Southern Hemisphere ocean temperatures have been rising much more quickly than previously thought, so much so that global ocean warming may have been underestimated by as much as 24 - 55%, according to a new study.

Published by the journal Nature Climate Change and carried out by researchers at the Lawrence Livermore National Laboratory, the study sought to determine just how much we've underestimated long-term upper-ocean warming given the scarcity of data collected on Southern Hemisphere ocean temperature increases.

“It's likely that due to the poor observational coverage, we just haven't been able to say definitively what the long-term rate of Southern Hemisphere ocean warming has been,” said the study's lead author, Dr. Paul Durack.

Using satellite data, which offers accurate assessments of sea-leavel rise, predictions based on published findings in Northern Hemisphere oceans, and “a large suite of climate models,” Durack and the other researchers discovered that not only has there been perhaps twice as much ocean warming as scientists had thought, but that the upper layers of the world's oceans—the top 700 meters, or just under 2,300 feet—have been impacted the most by climate change.

“We continue to be stunned at how rapidly the ocean is warming,” Sarah Gille, a Scripps Institution of Oceanography professor who was not involved in the study, told Climate Central.

Mon, 2014-08-11 12:50Chris Rose
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Fossil Fuels Raising Mercury Levels in Oceans: Study

An alarming new study has found that human activities mostly associated with burning fossil fuels has resulted in a massive increase in the levels of toxic mercury in the world’s oceans.

Published last week in the prestigious international journal Nature, the study, A global ocean inventory of anthropogenic mercury based on water column measurements, revealed that levels of the environmental poison in marine waters less than 100 metres deep have more than tripled since the Industrial Revolution.

Using water samples collected during research trips in the Pacific, Atlantic, Southern and Arctic oceans from 2006 until 2011, scientists analyzed mineral mercury levels attributed to fossil fuels, mining and sewage in both shallow and deep seawater.

While they found that mercury levels in ocean waters less than 100 metres deep had increased by a factor of 3.4 since the dawn of the Industrial Revolution, concentrations of mercury throughout the entire ocean had only jumped about 10 percent.

The scientists were affiliated with the Woods Hole Oceanographic Institution, Wright State University, Observatoire Midi-Pyréneés in France, and the Royal Netherlands Institute for Sea Research.

With the increases we’ve seen in the recent past, the next 50 years could very well add the same amount we’ve seen in the past 150,” said Woods Hole marine chemist Carl Lamborg, who led the study.

The trouble is, we don’t know what it all means for fish and marine mammals. It likely means some fish also contain at least three times more mercury than 150 years ago, but it could be more. The key is now we have some solid numbers on which to base continued work.”

Mon, 2009-04-06 23:15Jeremy Jacquot
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Parsing Dennis Avery's Other Dubious Claims

Dennis Avery may have done the fact-challenged (yes, again) WaPo columnist George Will one better by actually admitting he’d “misstated” that CO2 levels at Mauna Loa were declining (when they were, in fact, quite clearly rising), but the remainder of his column was so error-filled that I thought it deserved another look.

Take the first half of the piece, in which he approvingly cites Australian – and Oxford-trained – research physicist Tom Quirk to make the jaw-dropping argument that natural climate variability, and not anthropogenic activity, is to blame for elevated atmosphere CO2 levels. A quick look at Avery’s list of citations informs us that Quirk’s article appeared in a recent issue of Energy and Environment, a “peer-reviewed” journal curated by Sonja Boehmer-Christiansen, which does not inspire great confidence in its scientific rigor.

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