A consortium of countries are meeting in Iceland, where they hope to strike a deal that protects the newly accessible ecosystem.
The Arctic Ocean has long been the least accessible of the world’s major oceans.
But as climate change warms the Arctic twice as fast as anywhere else, the thick sea ice that once made it so forbidding is now beating a hasty retreat.
Since 1979, when scientists began using satellites to track changes in the Arctic sea-ice expanse, its average summertime volume has dropped 75 percent from 4,000 cubic miles to 1,000 cubic miles.
By September, the Arctic Ocean will have swapped nearly 4 million square miles of ice for open ocean.
This accelerated transformation has troubled scientists, conservationists and government officials who are anxious about the fate of the fish that may live in these waters—and for the entire ecosystem itself.
At the center of the Arctic Ocean is a 1.1 million square-mile “donut hole,” surrounded by Canada, the Danish territory of Greenland, Norway, Russia and the United States.
The donut hole does not fall under any country’s jurisdiction, and it may well be the last unexploited fishery on Earth.
According to international law, anyone could fish these newly opening high seas, if they desired, and thanks to the retreating ice, they may soon have their chance.
Map of the area of northern Barents Sea including the waters around Svalbard where some of the world’s largest seafood and fishing companies have committed not to expand their search for cod into.
Image : Greenpeace
This week, delegations from the five Arctic coastal states and five of the world’s largest fishing jurisdictions are meeting in Reykjavík to hammer out a deal to prevent commercial fishing boats from casting their nets into the international waters of the Arctic until scientists complete a full assessment of its fish stocks.
“It’s my hope that we will actually bring this home, find some compromises on the key issues and produce an agreement that everyone can go ahead and sign,” says Ambassador David Balton, the deputy assistant secretary for Oceans and Fisheries at the U.S. Department of State, who is chairing the talks.
Baffin Fisheries' MV Sivulliq
The agreement aims to avoid the tragedy that occurred in the Bering Sea in the 1980s.
At the time, the U.S. and the Soviet Union fished for pollock within their respective waters.
Almost no one believed there were fish—or foreign fleets—in the international waters between them, says David Benton, a retired fisheries manager from Alaska and a member of the U.S. Arctic Research Commission.
Map of temperature anomalies from average during February 2017
credit NASA
A pair of Alaskan fishermen who thought otherwise chartered an airplane to fly over the donut hole and spotted close to 100 working vessels.
At its height, fishing fleets from Japan, China, Poland, South Korea and others were drawing more than a million of tons of pollock from the waters annually.
“It wasn’t illegal fishing because it was international waters,” says Benton, who is advising the U.S. delegation. But it was unregulated.
A fishing boat cruises in the Ilulissat fjord, on Greenland's western coast.
An international treaty was quickly negotiated, but it was too late.
By the early 1990s, the pollock stock had collapsed.
Twenty-five years later it has still not recovered.
Compared with the donut hole in the Bering Sea, which clocks in close to 50,000 square miles, the one in the Arctic Ocean is enormous.
“There has been a lot of discussion about shipping in the Arctic Ocean, but in my experience the first people into an ocean are the fishermen,” says Peter Harrison, an Arctic policy and fisheries expert at Queen’s University in Canada, and a former deputy minister of Canada’s Department of Fisheries and Oceans.
Lately, as much as 42 percent of the central Arctic Ocean is open water during the summer months.
After three years of collecting data, the highest resolution map of Earth’s lithospheric magnetic field from space to date has been released.
The dataset combines measurements from ESA’s Swarm satellites with historical data from the German CHAMP satellite using a new modelling technique that allowed scientists to extract tiny magnetic signals from Earth’s outer layer.
Red represents areas where the lithospheric magnetic field is positive, while blues show areas where it is negative.
It is the best depiction yet of the magnetism retained in Earth's rocks, as viewed from space.
The
map was constructed using data from Europe’s current Swarm mission,
combined with legacy information from a forerunner satellite called
Champ.
Variations as small as 250km across are detectable.
Clearly
seen are the "stripes" of magnetism moving away from mid-ocean ridges -
the places on the planet where new crust is constantly produced.
This
pattern - the consequence of periodic changes in Earth's polarity being
locked into the minerals of cooling volcanic rock - was one of the key
pieces of evidence for the theory of plate tectonics.
On land, the signal tends to reflect the composition and thickness of the different rock layers that make up the continents.
Generally
speaking, younger crust will be thinner and have a low content in
magnetic minerals. Whereas, the old cratons, those stable interior
sections of continents, will tend to be thicker and have a higher
magnetic mineral content.
Detecting any of this from orbit is a
challenge because the signals are dwarfed by that part of the global
magnetic field coming from the dynamo - the movement of liquid iron in
the Earth's outer core.
Artwork: The Swarm mission flies a trio of satellites above the Earth
(ESA)
Stand on the surface of the planet and the intensity of the global
field may be between 25,000 and 65,000 nanoTeslas (a fridge magnet is a
thousand times stronger).
"Again it depends where you are but the
lithospheric signal is well below 100nT, even 50nT, on average,"
explained Nils Olsen from the Technical University of Denmark and one of
the scientists who created the new space map.
"But we have
certain regions where it can reach up to 2,000nT, and one of these
regions is the Bangui anomaly in western Africa," he told BBC News.
This
sharp signal in the Central African Republic is the possible impact
site of a large iron asteroid more than 500 million years ago.
The Bangui anomaly in western Africa may trace an asteroid impact 540 million years ago
(ESA/DTU Space/DLR)
Another high intensity region in the crust is the famous Kursk
anomaly in central Russia where substantial reserves of iron ore have
been mined.
The German Champ spacecraft measured Earth's magnetic field from orbit between 2000 and 2010.
It was succeeded in 2013 by the Swarm trio of satellites operated by the European Space Agency (Esa).
Champ
was lower in the sky than Swarm is currently, and so found it easier to
detect the lithospheric magnetism. However, the sophistication of the
new mission and the subtle differences the newer satellites can sense in
side-by-side observations mean further detail still can be extracted
from the data.
Champ alone was getting a resolution of 300-330km, so the combined model is a big step forward.
The new space information will be fed into future versions of the WDMAM
(J.KORHONEN ET AL)
Our very best global view of crustal magnetism is the World Digital
Magnetic Anomaly Map (WDMAM), which was put together by scientists over
many years, and includes much high-resolution aero- and ship-borne
measurements.
But the WDMAM would be very patchy if it did not also include space data, said Mike Purucker from the US space agency.
"The
World Digital Magnetic Anomaly Map is a 5km grid at 5km altitude around
the world. The longwave component is provided by satellite observations
and the shorter wavelengths by aero and marine surveys.
"[The
satellite data] defines better the magnetic field under the auroral
ovals where it has been very difficult to separate internal from
external fields," he told the BBC.
Future versions of the WDMAM will now make use of the updated Champ/Swarm view.
Having
maps of crustal magnetism is important for investigating the geological
history of Earth and for understanding the distribution of commercially
important mineral resources, says Kathy Whaler from Edinburgh
University, UK.
"[The new Swarm/Champ] model should mean estimates to the depth at which magnetisation is lost are better.
"Our assumption is this is where the temperature reaches the Curie point.
There has previously been a suggestion that this is deeper in some
subduction regions, as well as possibly over old, thick, stable cratons,
for example.
"We should be able to estimate these depths as a
function of position on the surface more accurately, and thereby
understand some of the large-scale tectonics better."
The magnetic stripes associated with seafloor spreading underpin plate tectonics theory
(Image copyright ESA/DTU Space/DLR Image caption)
Swarm itself is trying to provide greater insights on all of the different contributors to the global magnetic field.
As
well as the rocks and that dominant signal coming from the swirling
convection of molten iron in the core, there are other inputs pulling on
the needle of every compass.
These include the magnetism
generated by electric fields high above the Earth, and even a very
subtle effect derived from the movement of salt water ocean currents.
Image caption Earth's magnetic field acts as shield to deflect potentially damaging particles coming from the Sun
(Image copyright SPL)
Long-term observations will tease apart the size of each contribution and how it varies through time.
"The
Bravo satellite is still at slightly above 500km and the Alpha and
Charlie satellites are at 443km, roughly. So we are still at a good
altitude,” said Esa's Swarm mission manager, Rune Floberghagen.
“Considering
the fuel situation, we are set for a very, very long mission - far
beyond the upcoming solar minimum and following solar maximum, and
perhaps even up to the solar minimum after that."
This would mean at least one Swarm satellite still working in 2031.
This animation shows changes in Earth's magnetic field from January to June 2014
as measured by ESA's Swarm trio of satellites.
It
is a fascinating prospect because one key to understanding Earth's
magnetic field is seeing how it interacts with the magnetic fields and
particle matter emanating from the Sun over its 11-year cycle of
activity.
The ocean is not uniform.
Temperature, salinity, and other
characteristics vary in three dimensions, from north to south, east to
west, and from the surface to the depths.
With its own forms of
underwater weather, the ocean has fronts and circulation patterns that
move heat and nutrients around its basins.
Changes near the surface
often start with changes in the depths.
Spanning one-third of Earth’s surface, the tropical Pacific Ocean
receives more sunlight than any other region on Earth, and much of this
energy is stored in the ocean as heat.
Under neutral, normal conditions,
the waters near southeast Asia, Indonesia, and Australia are warmer and
sea level stands higher than in the eastern Pacific; this warm water
tends to get pushed west and held there by easterly trade winds.
But every two to seven years, this pattern is disrupted.
During El
Niño events, the surface waters of the central and eastern Pacific Ocean
become significantly warmer than usual and wind patterns change.
Easterly trade winds (which usually blow from the Americas toward Asia)
falter and can even turn around into westerlies.
This allows great
masses of warm water to slosh from the western Pacific toward the
Americas.
The arrival of this warm water reduces the upwelling of
cooler, nutrient-rich waters from the deep—shutting down or reversing ocean currents along the equator and along the west coast of South and Central America.
The “western Pacific warm pool” and the waves that propagate from it
can extend down to 200 meters in depth, a phenomenon that can be
observed by moored or floating instruments in the ocean:
satellite-tracked drifting buoys, moorings, gliders, and Argo floats that cycle from the surface to great depths.
These in situ instruments (more than 3,000 of them) record temperatures and other traits in the top 300 meters of the ocean.
The still image at the top shows a cross-section of the Pacific Ocean
in November 2015, near the peak of the most recent El Niño event.
Based
on data from the Global Data and Assimilation Office,
the map shows temperature anomalies; that is, how much the temperatures
at the surface and in the depths ranged above or below the long-term
averages.
The animation shows the changes in the Pacific from January 2015
through December 2016.
Note the warm water in the depths starting to
move from west to east after March 2015 and peaking near the end of
2015. (The western Pacific grows cooler than normal.)
By March 2016,
cooler water begins moving east, sparking a mild La Niña in the eastern
Pacific late in 2016, while the western Pacific begins to warm again.
Data collected Feb. 28 - March 12, 2017, by the U.S./European Jason-3 satellite show near-normal ocean surface heights in green, warmer areas in red and colder areas in blue.
Ocean surface height is related in part to its temperature, and thus is an indicator of how much heat is stored in the upper ocean.
Credit: NASA/JPL-Caltech
El Niño’s episodic shifts in winds and water currents across the Pacific can cause floods in the South American desert while stalling and drying up the monsoon
in Indonesia and India.
The atmospheric circulation patterns promote
hurricanes and typhoons in the Pacific while knocking them down over the
Atlantic.
Fish populations in one part of the ocean might crash, while
others thrive and spread well beyond their usual territory.
El Niño is one of the most important weather-producing phenomena on Earth, a “master weather-maker,” as author Madeleine Nash once called it.
In the northern hemisphere, the vernal equinox heralding the beginning of spring occurred Monday. Although there’s still snow on the ground and cold weather in the forecast, one can’t deny the new season has arrived.
March 20th marks the beginning of astronomical spring, which will last until the summer solstice on June 20. (NASA)
Astronomical spring begins when the sun reaches a certain height over the equator each year.
While nearly everyone knows spring arrives around March 20, what’s actually occurring in terms of the relationship between the earth and the sun still isn’t universally understood.
On both the vernal and autumnal equinoxes, the sun is directly overhead at noon at some place along the equator of our planet.
This year, the first of these two occurrences happened at 6:29 a.m Eastern Standard Time on March 20.
Basically, if you were in central Africa and looked up at noon, the sun would be directly above your head, forming a 90-degree angle with the ground.
On Friday, Sept. 22, at 4:02 p.m., the same thing will occur at a different spot along the equator to begin the fall season.
It falls at the same instant around the globe. The moment of the vernal or spring equinox was yesterday 10:29 UTC. That marks the moment when the sun crossed the equator and its axis was tilted neither toward or away from the sun.
Just before sunrise, the sun is even with the horizon and then rises during the day, reaching the maximum height exactly between sunrise and sunset.
The highest point the sun reached around Boston Monday is about 48 degrees above the horizon.
This angle will continue to increase until the first day of summer, when it’s at about 71 degrees.
The spring equinox always falls on March 19, 20, or 21. It most often will come on the 19th or 20th.
The next time it will fall on March 21st will be 2101.
(The last time was in 2007.)
From then on it falls, reaching a minimum of 24 degrees as winter begins.
Other places on the planet have different maximum heights.
There’s always someplace where the sun is directly overhead, but it only occurs exactly at the equator on the equinox.
On the first day of spring, the sun will reach different maximum heights across the planet.
The sun is up all day at the South Pole during our fall and winter, but down all day during our spring and summer.
The word “equinox” is derived from the Latin words meaning “equal night.”
While nearly all spots on Earth have about 12 hours of darkness and light as spring begins, it’s not exact.
Depending on where you live on the planet, the day on which you have equal day and night shifts on the calendar.
Multiple factors cause this, including the shape of the planet and the way the sun’s light is bent as it passes through the atmosphere.
In a world in which many of us are overextended and stressed, the fact that the planet is spinning around a tilted axis at over 1,000 miles per hour can be lost.
With the arrival of spring, take a moment to ponder the changes occurring, and how the increase in light and strength of the sun will soon be melting the snow, warming the earth, and bringing about that magical and dramatic metamorphosis to our landscape known as spring.
The UK’s biggest ever oil spill in 1967 taught invaluable lessons about
the response to disasters, toughened up shipping safety and stirred
green activism
“I saw this huge ship sailing and I thought he’s in rather close, I hope
he knows what he’s doing,” recalled Gladys Perkins of the day 50 years
ago, when Britain experienced its worst ever environmental disaster.
The ship was the Torrey Canyon, one of the first generation of
supertankers, and it was nearing the end of a journey from Kuwait to a
refinery at Milford Haven in Wales.
The BP-chartered vessel ran aground
on a rock between the Isles of Scilly and Land’s End in Cornwall,
splitting several of the tanks holding its vast cargo of crude oil.
The stricken oil tanker Torrey Canyon two days after she stuck fast on
the notorious Seven Stones Reef, near the Isles of Scilly and Land’s
End.
Photograph: Staff/AFP/Getty Images
“I just could not believe it. They’d hit the Seven Stones [reef] in
broad daylight,” said the 90-year old resident of St Martin’s, the
northernmost of the isles.
What followed that night was an oil spill
eight-miles long which grew to 20 miles long within 24 hours, and later
hit hundreds of miles of coastline.
Following a navigational error, Torrey Canyon struck Pollard's Rock on Seven Stones reef between the Cornish mainland and the Isles of Scilly on 18 March 1967.
The tanker did not have a scheduled route and as such lacked a complement of full scale charts of the Scilly Islands. To navigate the region, the vessel used LORAN, but not the more accurate Decca Navigator.
Torre Canyon geographical position with the GeoGarage platform (UKHO chart)
It remains Britain’s biggest oil spill at up to 117,000 tonnes, or 1,231-times more than the amount leaked by a BP North Sea platform last year.
The ripples from the spill are still felt 50 years on.
An unknown
quantity of the oil remains in a Guernsey quarry, where spill response
teams carry out a training exercise each year.
Much of the oil that washed up on Guernsey was pumped into an old
quarry, fenced off to the public and used today to train disaster
response teams.
Photograph: Graeme Robertson for the Guardian
Today’s Department for Environment, Food and Rural Affairs and the
environmental groups with millions of members are also partly a product
of the incident.
So is the way that authorities react to spills, and the
shipping industry’s modern failsafe measures.
At the time, the crisis ignited an incredible chain of responses.
The
government, led by prime minister and Scilly Isles holidayer Harold
Wilson, unleashed RAF bombers to sink the wreck and released thousands
of tonnes of detergent that proved toxic to marine life.
“The cure was worse than the malady,” said Stephen J Hawkins, a
scientist at the Plymouth-based Marine Biological Association, which
studied the spill’s impact on wildlife and habitats.
“Today people are
better prepared. Then, people didn’t know, they were making it up as
they went along.”
Initially it was thought the ship could be salvaged, a prospect
supported by its owners, the Bahama-based Barracuda Tanker Corporation.
Later, the home secretary, Roy Jenkins, said ministers considered towing
it to to the mid-Atlantic and sinking it.
Eventually, they decided the
best way of stopping the oil pollution was to bomb and sink the stricken
vessel.
Ten days after the supertanker began leaking, on 28 March, Buccaneer
bombers took off with the mission of sending the Torrey Canyon to the
seabed.
“From the hill at the back of St Martin’s we had a grandstand
view of these planes going over. Then there was a huge pall of horrible,
black smoke,” said Perkins.
The Royal Navy decided to bomb and sink the Torrey Canyon.
Photograph: -/AFP/Getty Images
Only 23 of the 41 1,000lb bombs dropped in Operation Oil Buster actually
hit the huge target. However, “the navy made an efficient job of it,
providing a ‘spectacular’ not seen since the war,” wrote Guardian
reporter, Dennis Barker, who passed away in 2015.
Perhaps most spectacular of all, the RAF Buccaneers were followed by
Hawker Hunters and Sea Vixens, and napalm was dropped in an effort to
burn off the oil.
The resulting “ring of fire” sent up a three-mile
smoke plume that it was reported could be seen 100 miles away.
Finally,
on 30 March, the ship began to sink.
The government also poured 10,000 tonnes of a BP-manufactured
“detergent”, a crude first generation dispersant, into the sea and on
the shore. In some cases, barrels of the stuff were literally rolled off
cliffs.
“BP, whose oil it was, was selling detergent in industrial quantities
which was getting poured over the beaches, killing off the
microorganisms which would have broken down the oil,” said Tony Soper,
now 88, who reported on the story for the Western Morning News.
Hawkins, who has just this week been taking samples at Porthleven in
West Cornwall, found that areas where the detergents were not used,
because of concerns over seals, recovered in two to three years,
compared with the 13-14 years where the detergents were deployed.
“By the time the oil got to Guernsey, they didn’t treat things with dispersant. They learned from the lessons,” said Hawkins.
In total, hundreds of miles of coastline were affected by the oil
spill, and about 15,000 seabirds are thought to have died. Soper said:
“The tidal edge of the beaches in West Cornwall was simply covered by a
thick carpet of black goo. It was a pretty fearsome smell.”
While the wildlife has recovered in the decades since, some of the
disaster’s consequences are felt even now.
Some experts draw a direct
line between the incident and the creation in 1970 of the government’s
environment department, the first of its kind in the world.
Dr Rob Lambert, environmental historian at the University of
Nottingham, said: “Torrey Canyon led inexorably in a way to the
Department for the Environment. It was a recognition that the
environment had risen up to the top of the political agenda.”
Dispersant sprayed into the harbour.
Photograph: Jane Bown for the Observer
Lambert also credits the incident with sparking the first big rush of
environmental volunteering. People travelled from Bristol and further
afield in an attempt to clean birds, in sinks at hairdressers, at
dedicated animal rescue centres and reportedly even in prisons.
“We take eco volunteering as normal now, but this was the first big
example in Britain. The tragedy was that most of these birds were beyond
help and they died,” said Lambert.
Torrey Canyon made household names of some environmentalists,
including a Durham University botany and ecology lecturer called David
Bellamy.
An RSPCA notice in Cornwall informs people where to take injured birds.
Photograph: Jane Bown for the Observer
The 84-year broadcaster said of the disaster: “Many lessons were
learnt and are still being learnt. It was probably the first time that
words like environment and conservation were voiced on the media, later
to become so commonplace.”
He remembers coming to public notice after
being interviewed on TV by John Craven.
Government and industry responses to oil spills are much better
today, partly as a result of Torrey Canyon, according to Hawkins. Oil
spill contingency plans, something that did not exist in 1967, are in
place around the coast.
On rocky coasts, spilled oil is considered best
left alone, while in more vulnerable areas such as salt marshes, booms
are deployed.
The dispersants deployed are much less toxic, and rarely used at the
shore.
“The response is much more proportionate now,” said Hawkins.
Soldiers clean up the oil slick on the beach of Perros-Guirec.
Photograph: -/AFP/Getty Images
The International Maritime Organization said that many of the
measures to prevent a spill employed by today’s shipping industry, such
as double hulls and duplicate navigation controls, can be traced back to
the disaster of 1967.
Industry statistics show the number of shipping
spills worldwide is down 90% since the 1970s; 99.9% of crude oil last
year was delivered safely.
While Torrey Canyon’s physical impact has virtually disappeared,
there is one place it lives on, in the English Channel.
Nineteen days
after the tanker ran aground, the oil reached Guernsey’s beaches,
sparking an emergency operation to scoop it up and send 3,000 tonnes of
it, mixed with sand, to a granite quarry on the island.
Onlookers watch the distant bombing of the stricken Torrey Canyon.
Photograph: Jane Bown for the Observer
Some of the oil was later recovered and burned for power in the
1980s, but most sat in the quarry’s waters, occasionally coating
guillemots in oil.
Eventually, micro-organisms were deployed in 2008 to munch the oil,
but after a large quantity of oil surged to the surface in 2009, more
extreme measures were called for.
In total, 160,000 litres of
contaminated water was removed by buckets – but an unknown quantity of
the Torrey Canyon’s oil still remains below the surface.
“It’s just looking like a pond now,” said Steve Byrne, manager of the
GSPCA animal shelter, which has had no reports of oiled birds since
2012.
“We had been called out for 45 years to help them, so it’s great
news.”
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