by Deep Green Resistance News Service | Sep 12, 2013 | Climate Change
By University of South Florida
Acidification of the Arctic Ocean is occurring faster than projected according to new findings published in the journal PLoS One. The increase in rate is being blamed on rapidly melting sea ice, a process that may have important consequences for health of the Arctic ecosystem.
Ocean acidification is the process by which pH levels of seawater decrease due to greater amounts of carbon dioxide being absorbed by the oceans from the atmosphere. Currently oceans absorb about one-fourth of the greenhouse gas. Lower pH levels make water more acidic and lab studies have shown that more acidic water decrease calcification rates in many calcifying organisms, reducing their ability to build shells or skeletons. These changes, in species ranging from corals to shrimp, have the potential to impact species up and down the food web.
The team of federal and university researchers found that the decline of sea ice in the Arctic summer has important consequences for the surface layer of the Arctic Ocean. As sea ice cover recedes to record lows, as it did late in the summer of 2012, the seawater beneath is exposed to carbon dioxide, which is the main driver of ocean acidification.
In addition, the freshwater melted from sea ice dilutes the seawater, lowering pH levels and reducing the concentrations of calcium and carbonate, which are the constituents, or building blocks, of the mineral aragonite. Aragonite and other carbonate minerals make up the hard part of many marine micro-organisms’ skeletons and shells. The lowering of calcium and carbonate concentrations may impact the growth of organisms that many species rely on for food.
The new research shows that acidification in surface waters of the Arctic Ocean is rapidly expanding into areas that were previously isolated from contact with the atmosphere due to the former widespread ice cover.
“A remarkable 20 percent of the Canadian Basin has become more corrosive to carbonate minerals in an unprecedented short period of time. Nowhere on Earth have we documented such large scale, rapid ocean acidification” according to lead researcher and ocean acidification project chief, U.S. Geological Survey oceanographer Lisa Robbins.
Globally, Earth’s ocean surface is becoming acidified due to absorption of man-made carbon dioxide. Ocean acidification models show that with increasing atmospheric carbon dioxide, the Arctic Ocean will have crucially low concentrations of dissolved carbonate minerals, such as aragonite, in the next decade.
In the Arctic, where multi-year sea ice has been receding, we see that the dilution of seawater with melted sea ice adds fuel to the fire of ocean acidification” according to co-author, and co-project chief, Jonathan Wynn, a geologist from the University of the South Florida. “Not only is the ice cover removed leaving the surface water exposed to man-made carbon dioxide, the surface layer of frigid waters is now fresher, and this means less calcium and carbonate ions are available for organisms.
Researchers were able to investigate seawater chemistry at high spatial resolution during three years of research cruises in the Arctic, alongside joint U.S.-Canada research efforts aimed at mapping the seafloor as part of the U.S. Extended Continental Shelf program. In addition to the NOAA supported ECS ship time, the ocean acidification researchers were funded by the USGS, National Science Foundation, and National Oceanic and Atmospheric Administration.
Compared to other oceans, the Arctic Ocean has been rather lightly sampled. “It’s a beautiful but challenging place to work,” said Robert Byrne, a USF marine chemist. Using new automated instruments, the scientists were able to make 34,000 water-chemistry measurements from the U.S. Coast Guard icebreaker. “This unusually large data set, in combination with earlier studies, not only documents remarkable changes in Arctic seawater chemistry but also provides a much-needed baseline against which future measurements can be compared.” Byrne credits scientists and engineers at the USF College of Marine Science with developing much of the new technology.
From University of South Florida News: http://news.usf.edu/article/templates/?a=5681&z=210
by Deep Green Resistance News Service | Sep 17, 2012 | Climate Change
By John Vidal / The Guardian
One of the world’s leading ice experts has predicted the final collapse of Arctic sea ice in summer months within four years.
In what he calls a “global disaster” now unfolding in northern latitudes as the sea area that freezes and melts each year shrinks to its lowest extent ever recorded, Prof Peter Wadhams of Cambridge University calls for “urgent” consideration of new ideas to reduce global temperatures.
In an email to the Guardian he says: “Climate change is no longer something we can aim to do something about in a few decades’ time, and that we must not only urgently reduce CO2 emissions but must urgently examine other ways of slowing global warming, such as the various geoengineering ideas that have been put forward.”
These include reflecting the sun’s rays back into space, making clouds whiter and seeding the ocean with minerals to absorb more CO2.
Wadhams has spent many years collecting ice thickness data from submarines passing below the arctic ocean. He predicted the imminent break-up of sea ice in summer months in 2007, when the previous lowest extent of 4.17 million square kilometres was set. This year, it has unexpectedly plunged a further 500,000 sq km to less than 3.5m sq km. “I have been predicting [the collapse of sea ice in summer months] for many years. The main cause is simply global warming: as the climate has warmed there has been less ice growth during the winter and more ice melt during the summer.
“At first this didn’t [get] noticed; the summer ice limits slowly shrank back, at a rate which suggested that the ice would last another 50 years or so. But in the end the summer melt overtook the winter growth such that the entire ice sheet melts or breaks up during the summer months.
“This collapse, I predicted would occur in 2015-16 at which time the summer Arctic (August to September) would become ice-free. The final collapse towards that state is now happening and will probably be complete by those dates”.
Wadhams says the implications are “terrible”. “The positives are increased possibility of Arctic transport, increased access to Arctic offshore oil and gas resources. The main negative is an acceleration of global warming.”
“As the sea ice retreats in summer the ocean warms up (to 7C in 2011) and this warms the seabed too. The continental shelves of the Arctic are composed of offshore permafrost, frozen sediment left over from the last ice age. As the water warms the permafrost melts and releases huge quantities of trapped methane, a very powerful greenhouse gas so this will give a big boost to global warming.”
From The Guardian: http://www.guardian.co.uk/environment/2012/sep/17/arctic-collapse-sea-ice
by Deep Green Resistance News Service | Aug 23, 2012 | Climate Change
By John Vidal / The Guardian
Arctic sea ice is set to reach its lowest ever recorded extent as early as this weekend, in “dramatic changes” signalling that man-made global warming is having a major impact on the polar region.
With the melt happening at an unprecedented rate of more than 100,000 sq km a day, and at least a week of further melt expected before it begins to reform ahead of the northern winter, satellites are expected to confirm the record – currently set in 2007 – within days.
“Unless something really unusual happens we will see the record broken in the next few days. It might happen this weekend, almost certainly next week,” Julienne Stroeve, a scientist at the US National Snow and Ice Data Centre in Boulder, Colorado, told the Guardian.
“In the last few days it has been losing 100,000 sq km a day, a record in itself for August. A storm has spread the ice pack out, opening up water, bringing up warmer water. Things are definitely changing quickly.”
Because ice thickness, volume, extent and area are all measured differently, it may be a week before there is unanimous agreement among the world’s cryologists (ice experts) that 2012 is a record year. Four out of the nine daily sea ice extent and area graphs kept by scientists in the US, Europe and Asia suggest that records have already been broken.
“The whole energy balance of the arctic is changing. There’s more heat up there. There’s been a change of climate and we are losing more seasonal ice. The rate of ice loss is faster than the models can capture [but] we can expect the arctic to be ice-free in summer by 2050,” said Stroeve.
“Only 15 years ago I didn’t expect to see such dramatic changes, no one did. The ice-free season is far longer now. Twenty years ago it was about a month. Now it’s three months. Temperatures last week in the arctic were 14C, which is pretty warm.”
Read more from The Guardian: http://www.guardian.co.uk/environment/2012/aug/23/arctic-sea-ice-record-low
by Deep Green Resistance News Service | Jul 16, 2012 | Mining & Drilling, Obstruction & Occupation
By Laurie Tuffrey / The Guardian
Greenpeace activists shut down 74 Shell petrol stations in Edinburgh and London in a protest against the company’s plans to drill for oil in the Arctic that saw 24 campaigners arrested on Monday.
The campaigners are attempting to shut off petrol to London’s 105 Shell stations and Edinburgh’s 14. Seventy-one have been closed in London and three in Edinburgh.
There have been 24 confirmed arrests, 18 in London and six in Edinburgh. The police in Edinburgh have reportedly parked cars outside all Shell stations across the capital.
Protesters have scaled the roof of the Shell station on Queenstown Road near Battersea Park in London and on Dalry Road in Edinburgh, with police and fire crews attending the scene in Edinburgh.
Activists arrived at the Battersea Park branch at 6.45am and used the station’s barriers to close down the forecourt. They have since covered the Shell sign with a Save the Arctic banner and positioned a life-sized polar bear model on the station’s roof.
The activists are shutting down the stations by using an emergency shut-off switch to stop petrol going to the pumps and then removing a fuse to delay it being switched on again. The organisation has since posted a picture of an activist posting one of the fuses to Shell’s head of Arctic drilling, with the message: “We’re being careful not to destroy property. Even the carefully removed components will go back to Shell.”
The protest is part of Greenpeace’s Save the Arctic campaign, which is aiming to prevent oil drilling and industrial fishing in the Arctic by having the region recognised as a world park. The organisation understands that Shell is going to begin drilling in the Alaskan Arctic in the coming weeks, with the Russian oil company Gazprom also due to work in the region.
The campaign group’s website is running a TV talkshow-style live broadcast covering the protest and showing interviews and videos about the Arctic campaign.
Sara Ayech, a campaigner at the Battersea Park station, said: “It’s time to draw a line in the ice and tell Shell to stop. That’s why today we’re going to shut down all of Shell’s petrol stations in the capital cities of London and Edinburgh. We’ve got dozens of people who will hit over 100 Shell garages throughout the day.”
Graham Thompson is another campaigner who helped shut down the station: “The staff were very pleasant and very reasonable. Obviously they’re not entirely happy about what’s going on but they’ve responded in a very civilised way.
“Obviously, we need to ratchet up the pressure, we need to let Shell know that this isn’t just a publicity campaign, we’re going to put pressure on them until they agree to stop what they’re doing,” said Thompson, commenting on future plans.
Read more from The Guardian: http://www.guardian.co.uk/environment/2012/jul/16/greenpeace-activists-shell-petrol
by Deep Green Resistance News Service | May 21, 2012 | Climate Change
By Sara Reardon / New Scientist
Melting Arctic permafrost could put even more methane – a potent greenhouse gas – into the atmosphere than previously thought, with worrying implications for the pace of global warming.
Many ice sheets that sit like caps over rock crevices trap natural seeps of methane; when they melt, the gas can quickly be released into the atmosphere in “burps”. Geologists have long suspected that iced-over geological structures might entrap vast stores of ancient methane that seep from coal and gas deposits, although no one knows exactly how much is there.
These stores, along with deep-water stores and shallow (more recent) deposits of decaying plant material in frozen soil, might open as the Arctic warms, releasing vast amounts of methane. Then, as the climate warms, more methane seeps could open and warming could accelerate.
During the winter, when Alaska was covered with ice, Katey Walter Anthony of the University of Alaska in Fairbanks and her colleagues flew planes over 6700 lakes in the state, looking for holes in the ice that might indicate lakes with methane seeps. They analysed gas from 50 holes and carbon dated the methane leaking from them to determine the age of the gas. They did a similar survey of 25 lakes in Greenland.
Ancient gas
At boundaries where permafrost cover is melting or glaciers are retreating, the researchers found old methane, indicating that it came from deep in the Earth and is only now being released. The team then created a model that extrapolated where these natural pockets would be located in lakes throughout Alaska. They found the likeliest locations at the edges of ice sheets.
The team estimate that Alaska is emitting 50 to 70 per cent more methane into the atmosphere than previously thought. Geological records indicate that the model would also apply to deep methane stores in Canada and Siberia, currently covered by ice.
Walter Anthony says that the presence of oil and gas in the Antarctic indicates it may hold ancient methane as well. “This is a far more nuanced study than has been done,” says Carolyn Ruppel of the US Geological Survey in Woods Hole, Massachusetts. Although she praises Walter Anthony’s modelling work, she points out that extrapolating the findings to draw conclusions about methane seeps on other continents is very difficult.
Any release of methane could accelerate warming at the poles and speed the entire process, Walter Anthony says, but it’s hard to predict exactly how soon this could happen. To answer this, her group plans to look at how methane is captured and stored in permafrost, and the pattern in which it melts.
From New Scientist: http://www.newscientist.com/article/dn21830-release-of-arctic-methane-could-accelerate-warming.html
