Friday, January 11, 2013

Brazil DHN update in the Marine GeoGarage


23 charts have been added since the last update :
(DHN update January 4, 2013)

  • 3335      DO RIACHO GUAICURUS À ILHA SANTA MARIA
  • 3339      DA ILHA CAMBÁ NUPÁ À ILHA JOSÉ KIRÁ
  • 3342      DE FORTE OLIMPO AO PASSO CURUÇU CANCHA
  • 3344      DA ILHA DO RABO DA EMA À ILHA DO ALGODOAL
  • 3345      DA ILHA DO ALGODOAL À VOLTA RÁPIDA
  • 3346      DA VOLTA RÁPIDA À ILHA DO CHAPÉU
  • 3347      DA ILHA PORTO NOVO À ILHA CAPÃO QUEIMADO
  • 3348      DO PUERTO ESPERANZA À ILHA CABEÇA DE BOI
  • 3349      DA ILHA SEPUTÁ À FOZ DO RIO NEGRO
  • 3350      DA FOZ DO RIO NEGRO À ISLA PATATIVA
  • 3351      DA ILHA SANTA FÉ AO PASSO REBOJO GRANDE
  • 3352      DO PASSO DO REBOJO GRANDE À ILHA DO MARCO
  • 3353      DO ESTIRÃO DE COIMBRA À ILHA PARATUDAL
  • 3354      DO PASSO PIÚVA INFERIOR À ILHA DOS BUGRES
  • 3355      DA ILHA DOS BUGRES À ILHA NABILEQUE
  • 3356      DO PASSO DO CONSELHO À VOLTA DO ACURIZAL
  • 3357      DA VOLTA DO ACURIZAL AO RIACHO DO ABRIGO
  • 3358      DA ORÇADA DE SÃO JOSÉ À ILHA CARAGUATÁ
  • 3359      DA ILHA CARAGUATÁ À ILHA CAMBARÁ FERRADO
  • 3360      DO ESTIRÃO CAMBARÁ FERRADO AO PASSO ABOBRAL
  • 2791      LAGO DE BRASÍLIA - PARTE CENTRAL  (02/10/2012)
  • 2792      LAGO DE BRASÍLIA  (02/10/2012)
  • 21400      DO CABO MAGUARI À PONTA BOIUÇUCANGA   (28/09/2012)
Today 356 charts (406 including sub-charts) from DHN are displayed in the Marine GeoGarage
Don't forget to visit the NtM Notices to Mariners (Avisos aos Navegantes)

Global mercury pollution in oceans top layer doubled in last century


There's a tight and surprising link between the ocean's health and ours, says marine biologist Stephen Palumbi.
He shows how toxins at the bottom of the ocean food chain find their way into our bodies, with a shocking story of toxic contamination from a Japanese fish market.
His work points a way forward for saving the oceans' health -- and humanity's.

From HuffingtonPost

Mercury pollution in the top layer of the world's oceans has doubled in the past century, part of a man-made problem that will require international cooperation to fix, the U.N.'s environment agency said Thursday.

The report by the U.N. Environment Program showed for the first time that hundreds of tons of mercury have leaked from the soil into rivers and lakes around the world.

As a result of rising emissions, communities in developing countries face increasing health and environmental risks linked to exposure to mercury, the U.N. agency says.

Fish are often contaminated with mercury, a toxic metal that builds up as it climbs the food chain.
Here are the average levels for 33 fish species, in parts per million
(source : MNN)

Mercury, a toxic metal, is widely used in chemical production and small-scale mining, particularly gold. It is a naturally occurring element that is found in air, water and soil, and it cannot be created or destroyed.

Mercury emissions come from sources such as coal burning and the use of mercury to separate metal from ore in small-scale gold mining, and mercury pollution also comes from discarded electronic and other consumer products.
Mercury in the air settles into soil from where it can then seep into water.

The report, an update on its previous global tallies of mercury in 2002 and 2007, comes in advance of talks in Geneva next week between nations negotiating a new legally binding treaty to reduce mercury emissions worldwide.

Such a treaty would represent a major reversal from previous years when major powers including the United States, China and India sought voluntary reductions.

Mercury concentrations accumulate in fish and go up the food chain, posing the greatest risk of nerve damage to pregnant women, women of childbearing age and young children.

The report says parts of Africa, Asia and South America could see increasing emissions of mercury into the environment mainly due to small-scale gold mining, and through coal burning for electricity. It found that mercury emissions from artisanal gold mining had doubled since 2005 due to factors such as rising gold prices and better reporting on the emissions.

Asia accounts for just under half of all global releases of mercury, the report said.

Over the past 100 years, mercury found in the top 100 meters of the world's oceans has doubled and concentrations in waters deeper than that have gone up by 25 percent, the U.N. agency said, while rivers and lakes contain an estimated 260 metric tons of mercury that was previously held in soils.

UNEP's executive director, Achim Steiner, said mercury pollution remains "a major global, regional and national challenge in terms of threats to human health and the environment" but new technologies can reduce the risks.

Links :
  • TheGuardian : Mercury poisoning is a growing global menace we have to address
  • BBC : UN: Rising mercury emissions increase risk to humans
  • IEDE : Treaty “Insufficient” to Reduce Global Mercury Levels
 

Thursday, January 10, 2013

NOAA chart reveals underwater hazard for proposed anchorage area

>>> geolocalization with the Marine GeoGarage <<<

From NOAA

Similar to a road map, nautical charts provide basic navigation information for mariners – such as water depths and the locations of hazards – to support safe navigation. 

Cartographers from NOAA’s Office of Coast Survey recently flagged a potentially dangerous situation during their review of a proposed federal rule establishing new anchorage areas on the Mississippi River.

The proposed anchorage areas were based on non-NOAA charts that did not depict the underwater pipelines.
The pipelines, which carry benzene, posed a potential danger if ships dropped anchor on top of them.

The pipeline areas are depicted on the NOAA nautical chart (#11370 Mississippi River-New Orleans to Baton Rouge 1:40,000)
That chart data and original source files led to the cancellation of the proposed anchorage area.

The Office of Coast Survey is the US nation's nautical chart maker, providing traditional paper charts as well as the charts used by commercial electronic navigational systems.
The suite of nearly a thousand nautical charts covers 95,000 miles of U.S. coastline.

Farm-raised tuna may not be the answer to overfishing


Divers from "The Changing Oceans Expedition" explore a red tuna farm in Malta.
Red tunas are trapped in large cages (approximately 1000 tuna in a 50m diameter cage) were they are fed systematically until they reach commercial size.

From BusinessWeek
 
With Japan mired in a further recession and electronics giants Sony (SNE), Panasonic (PC), and Sharp (6753) losing billions of dollars, the Japanese can take consolation that they’re still tops in some things.

Case in point: Nobody can beat its fishmongers.
Tsukiji fish market in Tokyo is the world’s biggest and its first auction of 2013 again set a record for the world’s priciest tuna.
Kiyomura, a sushi chain in Japan’s capital, paid ¥155.4 million ($1.76 million) on Jan. 5 for the honor of buying the first bluefin tuna of the year.
That’s triple the record set last year.

A bluefin tuna, bought for nearly three-quarters of a million US dollars has been sliced up and served to eager customers at a Japanese restaurant in Tokyo.
The tuna, caught off northeastern Japan fetched a record 56.49 million yen, (about 736,000 US dollars,) on Thursday in the first auction of the year at Tokyo's Tsukiji fish market.
The price for the 269-kilogramme (593-pound) tuna beat last year's record of 32.49 million yen (around 420,000 US dollars.)
Though the fish is undoubtedly high quality, the price has more to do with the celebratory atmosphere that surrounds the first auction of the year.
The winning bidder was Kiyoshi Kimura, the president of Kiyomura Co. which operates a nationwide sushi restaurant chain called Sushi-zanmai.
The best slices of fatty bluefin, called "o-toro" in Japan, can sell for 2,000 yen (24 US dollars) per piece at Tokyo sushi bars.
But the restaurant chain is offering the tuna at its usual price of 418 yen (around 5.44 US dollars) for an "o-toro", and cheaper for other less fatty parts of the tuna.
With a long queue of customers circling the block around the restaurant, Kimura has limited orders to just one piece per person.
The tuna was caught off Oma, in Aomori prefecture just north of the coast that was battered by the March 11 tsunami. Japan eats 80 percent of the Atlantic and Pacific bluefins caught, the most sought-after by sushi lovers.
Japanese fishermen, however, face growing calls for tighter fishing rules amid declining tuna stocks worldwide.

The price is about symbolism: The 222-kilogram (489 pound) tuna is big—big enough for 10,000 pieces of sushi—but that’s not unusual for bluefin.
An average Atlantic bluefin can weigh over 500 lbs. and the Pacific and Southern Ocean bluefin are hefty, too.
As such an outsized fish, bluefin easily capture media attention at the Tsukiji auction.
However, they also are more vulnerable than smaller fish to environmental disasters such as the 2010 oil spill in the Gulf of Mexico.
And because of the fish’s popularity among sushi lovers, overfishing of bluefin “has almost led to its extinction,” according to the World Wildlife Foundation.

The South Pacific is still relatively healthy and teeming with fish, but it is a fragile paradise. International fishing fleets are taking a serious toll on the sharks, albatross and tuna, and there are other insidious threats to these bountiful seas.

You might think that aquaculture is the answer.
Farm-raised salmon is common in the U.S.
A decade ago, few Americans ate tilapia, but now the white fish is a favorite of the food industry, thanks to farms in China and other countries.
Bluefin are much bigger than those other fish; as a result, they are much harder to breed on farms. Most bluefin are either caught in the wild (in the Atlantic, Pacific, and Southern oceans) or captured as small fish and raised on fish ranches.

However, catching bluefin tuna when they’re young and then raising them on giant fish farms just makes the problem worse, according to Seafood Watch, the Monterey Bay Aquarium’s program focusing on ocean sustainability.
“All populations of bluefin tuna are being caught faster than they can reproduce,” the California aquarium says on its website.
“Bluefin is being further depleted by ranching operations that collect small bluefin and raise them to full size to sell primarily to the sushi market.”
Seafood Watch has “Avoid” recommendations for both wild-caught and ranch-raised bluefin, and the Monterey organization isn’t the only group critical of the bluefin industry.
The Environmental Defense Fund has an “Eco-Worst Choice” grade for all types of bluefin tuna.
The EDF also warns about the health dangers of elevated levels of mercury and PCBs in the fish. “Adults and kids should not eat at all,” the organization warns.

Atlantic bluefin tuna at the opening of fishing season off Spain's southern coast
Photograph by Emilio Morenatti/AP Photo

For years, people in the fish industry have been pursuing the elusive goal of breeding bluefin completely on farms, from eggs all the way to mature fish.
Clean Seas Tuna, an Australian aquaculture company, has been one of the leaders in efforts to breed tuna; Time included the company’s breeding tank in the magazine’s “50 Best Inventions of 2009.”

However, Clean Seas announced right before Christmas that it was suspending its breeding program for southern bluefin tuna (SBT).
“The volume and quantity of fertilised eggs produced to date has been disappointing compared to other seasons,” the company said in a statement to the Australian stock exchange.
“Whilst the Company continues to believe in the commercialisation potential of the successful closure of the SBT lifecycle, investment beyond the Company’s current financial resources will be required for this goal to be achieved.”
Clean Seas stock traded at 2 Australian dollars in 2008 and now trades at 2 Australian cents.

Clean Seas isn’t the only bluefin-focused company facing some hard times.
Oli Steindorsson, the chairman and chief executive officer of San Diego-based Umami Sustainable Seafood, resigned from all his positions at the company, “effective immediately,” Umami announced on Dec. 10.
The new chairman, James White, serves on the boards of several resource companies, including PC Gold (PKL) and Auriga Gold (AIA).
Umami “believes that Mr. White is qualified to serve as chairman of the Board due to his financial background and experience in the debt and equity markets,” the company said.

I interviewed Steindorsson in 2011 and he warned then about the need for patience.
Given the challenges in trying to breed a fish that can easily weigh over 300 lbs., he said, Unami’s program would need five to seven further years before there would be results.
“This is not an Intel (INTC) chip, these are biological creatures,” he said.
“No matter how fast we want to do this, we always have to respect the laws of nature.”

Links :
  • Mission Blue : New scientific report shows Pacific bluefin tuna population down 96.4%

Wednesday, January 9, 2013

Viral black iceberg photo will give you the chills

Black iceberg photo viral online
(Image: "Rundboll")

From TheExaminer

A photo of a giant black iceberg is going viral after Reddit user Rundboll posted the picture on Jan. 4, 2012.
The post has over 1,200 comments by fellow Redditors who gave the photo plenty of upvotes.

Not only is the photo of the black iceberg a viral sensation, one Reddit member left a comment about the unusual iceberg, lending some helpful information about it to those who never knew something like this existed.

User Bama011 posted: "Most icebergs are white except along freshly calved ice cliffs, which tend to appear blue. Others may appear green, brown or black, or combinations of these colours. These icebergs have usually rolled over, exposing basal ice, or have emerged from below water level. The various colorations are caused by differences in density, air-bubble content and impurities. For example, black ice is of high density and bubble free; dark layers indicate the presence of rock materials derived from the base of the parent glacier. Occasionally, rocks may be found on the original upper surface of the iceberg. As the iceberg melts, these materials precipitate into marine or lake sediments. "

His comment was pulled from the Canadian Enclyopedia, something Reddit members thought was as unusual as the black iceberg : the black color is due to the iceberg's high density, absence of bubbles, and the presence of rock materials derived from the base of the parent glacier.
"I'm Canadian and had no idea this resource existed."

According to the Canadian Encyclopedia, a black iceberg is not rare.
However, it is not captured on photo often, so it's no wonder the photo posted on Reddit went viral so quickly.
Have you ever seen a dark-colored iceberg?

Black iceberg @ Jökulsarlon (joshe on FlickR)

Jökulsarlon in South East Iceland in high resolution

Moraine, unstratified and unsorted deposits of sediment that form through the direct action of, or contact with, glacier ice (see USGS)