ApocaDocuments (4) matching "ocean warming" from this week
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Sat, Aug 28, 2010
from New York Times:
Pacific Hot Spells Shifting as Predicted in Human-Heated World
Federal researchers have published work concluding that a particular variant of the periodic El Niņo warmups of the tropical Pacific Ocean is becoming more frequent and stronger. The pattern appears to fit what is expected from human-driven warming of the global climate, said the researchers, Tong Lee of NASA's Jet Propulsion Laboratory and Michael McPhaden of the Pacific Marine Environmental Laboratory, part of the National Oceanic and Atmospheric Administration....
"The two threads of evidence together-from data and from computer models--suggest that climate change is affecting El Nino, rather than a natural variation in El Nino causing trends that may appear as if they are the result of man-made climate change. We can't be 100 percent certain that this interpretation is correct because the data are limited and the models are imperfect. But it provides us a plausible working hypothesis for further investigation into the nature and impacts of a changing face to El Nino."... "To add to that, some folks have suggested the possibility of natural variability in causing the warming (for example, we just happen to capture the rising part of a 60-year natural cycle). While that is possible, the so-called Pacific Decadal Oscillation (PDO) index that is used to characterize decadal and multi-decadal variability of the Pacific Ocean has not shown a significant increasing or decreasing three-decade trend from the 1980's to the 2000's (it's dominated by quasi-decadal fluctuation since 1980). So it's difficult to blame the El Niņo change to PDO." ...
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Can't blame El Nino, can't blame PDO. Why isn't science doing its job?
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Fri, Aug 27, 2010
from CBC:
Pursuing the mystery herring loss near Nova Scotia
Scientists from the Bedford Institute of Oceanography are on a mission to find out why herring fishermen in Nova Scotia are reporting fewer and smaller fish this season.
The researchers are using sounders and sonars to count the number of herring in an area known as the German Bank, off the southwestern coast of Nova Scotia.
The count may help explain why the catches have been coming up smaller this year.
"When the fishermen don't land fish, people think that there may not be fish," said Gary Melvin, a research scientist. "There can actually be fish. But we want to be sure, one way or the other."
Some fishermen said they believe the catches are smaller because the fish are avoiding warmer water temperatures near the surface and diving deeper, thereby eluding the large nets used to catch them.
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Avoiding warmer temperatures would be a smart survival strategy.
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Thu, Aug 26, 2010
from CBC:
Huge ice chunk breaks off Ellesmere Island
A large parcel of ice has fractured from a massive ice shelf on Ellesmere Island in Nunavut, marking the third known case of Arctic ice loss this summer alone.
The chunk of ice, which scientists estimate is roughly the size of Bermuda, broke away from the Ward Hunt Ice Shelf on the island's northern coast around Aug. 18, according to NASA satellite imagery.
At 40 metres thick, the Ward Hunt Ice Shelf is estimated to be 3,000 to 5,000 years old, jutting off the island like an extension of the land.
"The cracks are going right to the mainland, basically, right to Ellesmere Island," John England, a professor of earth and atmospheric sciences with the University of Alberta, told CBC News on Tuesday. "So, in the core of the ice shelf itself, the fracturing is occurring.
"I think that's really quite significant, that it's like the most resistant and most tenacious part of the ice shelf is now being dismantled."...
England said there is still a month to go in the summer ice loss season in the Arctic Ocean, raising the possibility that other parts of the Ward Hunt Ice Shelf -- particularly on the eastern side -- could easily break off.
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It's those eco-nazi terrorists, blowing ice up to convince us that the greenhouse thing is real.
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Tue, Aug 24, 2010
from PNAS, via Scientific American:
All-out geoengineering still would not stop sea level rise
Mimicking volcanoes by throwing particles high into the sky. Maintaining a floating armada of mirrors in space. Burning plant and other organic waste to make charcoal and burying it--or burning it as fuel and burying the CO2 emissions. Even replanting trees. All have been mooted as potential methods of "geoengineering"--"deliberate large-scale manipulation of the planetary environment," as the U.K.'s Royal Society puts it.... Arguably a more devastating consequence would be the rise of the seas as warmer waters expand and melting icecaps fill ocean basins higher, potentially swamping nations and the estimated 150 million people living within one meter of high tide. Can geoengineering hold back that tide?
That's what scientists attempted to assess with computer models in a paper published online August 23 in Proceedings of the National Academy of Sciences. In their words, "sea level rise by 2100 will likely be 30 centimeters higher than 2000 levels despite all but the most aggressive geoengineeering." In large part, that's because the ocean has a lot of thermal inertia: it only slowly warms as a result of increasing greenhouse gas levels--and it will only slowly cool down again.... Perhaps the only way to reduce warming enough to minimize the rise of the oceans is an all-out effort that also includes burning biomass as fuel (either to replace coal or gasoline or both) and pairing it with CO2 capture and storage. Together, they could suck down greenhouse gas levels by 180 ppm--more than enough to bring us below pre-industrial levels. As a result, sea level rise is held to just 10 centimers by 2100, according to the author's modeling.
Such extensive geoengineering seems impractical given its economic (and environmental) cost. ...
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We can't just build an armada of floating refrigerators?
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