Saturday, May 18, 2013

Timelapse of large calving event at Helheim Glacier, Greenland

In July 2010, researchers Timothy James and Nick Selmes were installing instruments
on the south shore of Helheim Fjord in Greenland when they heard the most unbelievable sound.
This is what unfolded before their eyes.
>>> geolocalization with the Marine GeoGarage <<<

From LiveSciences

A deafening rumble alerted two scientists to an amazing sight: the collapse of one of Greenland's biggest and fastest-moving glaciers.

And because the scientists were already in place with a time-lapse camera, they were able to capture the calving event — one of the biggest of these glacier collapses ever recorded on film.

Before the collapse, Timothy James, a researcher at Swansea University in the United Kingdom, was in southeastern Greenland in July 2010 to set up a remote camera to spy on Helheim Glacier where it meets the sea.
This meeting of glacier and ocean is called the calving front, and marks the zone where icebergs break off (or calve).

"This is an area that is very difficult to measure because [it is] so dynamic and unstable," James said in an email interview.
By using time-lapse photography, James and his colleagues hope to better understand changes at the calving front, and the factors that control how glaciers and ice sheets change over time, especially in response to climate.

"While providing important information about these events to scientists, we are hoping that our video will help people understand the scale of these calving events," James told OurAmazingPlanet.

Since 2001, Helheim Glacier has thinned by more than 130 feet (40 meters) and beat a hasty retreat, shrinking landward by more than 5 miles (8 kilometers).

Right place, right time

During the July 2010 calving event, about 0.4 cubic miles (1.5 cubic km) of ice — which would fill Central Park to a height of almost 1,000 feet (300 m), James calculated — crumbled off the glacier in 15 minutes.

"Even this, in the context of the ocean, isn't very much water, but there are thousands of glaciers like this around the world," James noted.
"This is how glaciers influence sea level.[However], it is important for people to understand that an individual calving event is not evidence of climate change. Large glaciers produce icebergs of this magnitude all the time. What's important is how the size and frequency of these events change over time and what causes them to occur," James said.

In summer 2010, James and Swansea colleague Nick Selmes had been dropped off by helicopter in Helheim Fjord to install cameras that would take digital photographs of the calving front every hour until the researchers picked up the cameras in autumn.

"After six days, we had installed two cameras that were running nicely, and we were installing the third camera when, out of nowhere, we heard this really deep rumble that was shooting down the fjord," James told OurAmazingPlanet.

Boom, then bleep

"The first thing we saw was the ice breaking off cross the fjord — we were quite excited about that," James said. "
As this progressed, my colleague, Nick Selmes, thought he could see a crack forming along the whole width of the glacier. Indeed, there was!
So I turned the camera, and we watched in awe.
It was absolutely amazing and something I will never forget.
There was so much noise we could hardly hear each other.

“This calving event was absolutely huge, and we were so excited,” he added.
“In retrospect, I'm glad we didn't have audio because there was a lot of shouting and quite a lot of swearing, if memory serves," James said.

The massive crack across Helheim Glacier was approximately 13,000 feet (4,000 m) long. And much of the giant glacier's height is hidden underwater, so about 2,600 vertical feet (800 m) of ice crashed into the water — much more than the 325 feet (100 m) visible in the film.
The falling ice created a giant wave.

"There is a huge face of ice that has to push through a lot of water," James said.
"The time-lapse gives the impression that the calving event happened quite quickly, but it was really surprising how slow it was."

Friday, May 17, 2013

U.S. Coast Guard releases 2012 Recreational Boating Statistics report

Basic Navigation & Charts - Boat Safety in NZ - Maritime New Zealand

From BoatingIndustry

Report shows lowest number of fatalities on record, overall drop in accidents and injuries

The U.S. Coast Guard released its 2012 Recreational Boating Statistics Monday, revealing that boating fatalities that year totaled 651, the lowest number of boating fatalities on record.
From 2011 to 2012, deaths in boating-related accidents decreased from 758 to 651, a 14.1 percent decrease; injuries decreased from 3,081 to 3,000, a 2.6 percent reduction; and the total reported recreational boating accidents decreased from 4,588 to 4,515, a 1.6 percent decrease.

The fatality rate for 2012 of 5.4 deaths per 100,000 registered recreational vessels reflected a 12.9 percent decrease from the previous year’s rate of 6.2 deaths per 100,000 registered recreational vessels.
Property damage totaled approximately $38 million.
“We’re very pleased that casualties are lower, and thank our partners for their hard work over the past year,” said Capt. Paul Thomas, director of Inspections and Compliance at U.S. Coast Guard Headquarters.
“We will continue to stress the importance of life jacket wear, boating education courses and sober boating.”

The report states alcohol use was the leading contributing factor in fatal boating accidents; it was listed as the leading factor in 1;7 percent of the deaths.
Operator inattention, operator inexperience, improper lookout, machinery failure and excessive speed ranked as the top five primary contributing factors in accidents.

Almost 71 percent of all fatal boating accident victims drowned, with 84 percent of those victims not reported as wearing a life jacket.
Approximately 14 percent of deaths occurred on vessels where the operator had received boating safety instruction.
The most common types of vessels involved in reported accidents were open motorboats, personal watercraft and cabin motorboats.

The Coast Guard reminds all boaters to boat responsibly while on the water: wear a life jacket, take a boating safety course, get a free vessel safety check and avoid alcohol consumption.

To view the 2012 Recreational Boating Statistics, go to :

Links :
  • NTnews : Maybe the sea life ain't for you, mate
The skipper has been summonsed for putting an unsafe vessel to sea following a search and rescue operation in Darwin Harbour yesterday.
"On Tuesday the 11m vessel was towed by the harbour Pilot boat to Fannie Bay after reporting rudder problems. During the night the catamaran has slipped anchor and again drifted into the harbour," said Senior Sergeant Paul Faustmann from the Water Police Section.
Snr Sgt Faustmann said the 60-year-old skipper contacted authorities for assistance but was unable to give Water Police any indication of his current position.
"Police were able to talk the man through steps to obtain a GPS reading from his mobile phone which indicated his approximate position as 5 nautical miles off Charles Point.
"The PV Darwin River located the catamaran but due to unfavourable conditions and the fact they would have become a hazard to shipping, it was safer to tow the vessel to sheltered waters off Mandorah where a full safety check was carried out.

"Officers found the skipper to be without a set of marine nautical charts, navigational aids and very little local knowledge of Darwin Harbour.
"The 60-year-old man and a 58-year-old female have suffered no injuries and are now safe - but the fact they set sail without charts, in an unseaworthy boat and without any real understanding of conditions certainly hampered the rescue efforts.
"This incident would not have occurred had the vessel been in a seaworthy condition and the skipper possessed the necessary equipment and knowledge.
"It is an offence to take an unseaworthy vessel to sea and an investigation into the incident is continuing."

Thursday, May 16, 2013

NZ Linz update in the Marine GeoGarage


12 charts have been updated in the Marine GeoGarage
(Linz April update published 2 May 2013 updates) 

  • NZ24 Western Approaches to South Island
  • NZ25 New Zealand, South Island
  • NZ56 Table Cape to Blackhead Point
  • NZ73 Abut Head to Milford Sound: Jackson Bay
  • NZ561 Approaches to Napier
  • NZ5214 Marsden Point
  • NZ5215 Whangarei Harbour
  • NZ5314 Mercury Islands
  • NZ5612 Napier Roads: Napier Harbour
  • NZ6153 Queen Charlotte Sound
  • NZ6154 Tory Channel Entrance and Picton Harbour
  • NZ7622 Milford Sound to Sutherland Sound
Today NZ Linz charts (178 charts / 340 including sub-charts) are displayed in the Marine GeoGarage.

Note :  LINZ produces official nautical charts to aid safe navigation in New Zealand waters and certain areas of Antarctica and the South-West Pacific.


Using charts safely involves keeping them up-to-date using Notices to Mariners

Open Data policy : the best thing Obama’s done this month

Alpha.data.gov, an experimental data portal
created under the White House's Open Data Initiative.

From Slate

His executive order to open government data is a really big deal.

Long before steam engines and turbines carried us swiftly over the oceans, a disabled sailor who could no longer serve on a ship found something to do ashore: aggregate the data from shipping logs.

When Matthew Fontaine Maury (see GeoGarage blog) started analyzing those logs and mapping them onto charts, he found previously invisible patterns in the data that showed patterns in weather, winds, and currents.

In 1855, Maury published this knowledge in a book,
The Physical Geography of the Sea.
(see NOAA)

He also made a crucial decision for navigators around the world:
After he collected the data, Maury then shipped them to anyone who wanted them, and he asked for contributions in return.
Over time, it became a worldwide project.
Maury saw great value in publishing the data “in such a manner that each may have before him, at a glance, the experience of all.”
Notably, President John Quincy Adams agreed.
Not long afterward, the United States created standards for reporting meteorological data and endowed the U.S. Naval Observatory.

The equal lines of ocean temperature on this chart (sinuous east-west lines) in Physical Geography of the Sea were generated "by actual observations made indiscriminately all over it" (p. 231).
Maury asserted that such information helped to "increase our knowledge concerning the Gulf Stream, for it enables us to mark out,…the 'Milky Way' in the ocean, the waters of which teem, and sparkle, and glow with life and incipient organisms as they run across the Atlantic." (p. 231)

In many ways, Maury's work and the government's codification and release of these data set the stage for the historic moment we find ourselves in.
Around the world, people are still using government weather data when they travel, though few consult nautical charts.
Instead, they tap into the growing number of devices and services that make open data more actionable.

For instance, think about how you use the mapping apps on an iPhone or Android device.
That glowing blue dot places you in time and space, enabling you to know not only where you are but how to get somewhere else.
In more than 450 cities around the world, when you look for mass transit options, the routes and even departure times for the next train or bus show up on that interactive map as well.

GPS constellation :
The first true “Open Data Directive” was a mandate for “Free and Open GPS Signals”.
This was created and championed by President Ronald Reagan in 1983.
The directive from President Reagan was a response to the terrible tragedy of a Korean Airlines flight that sadly strayed into Russian airspace and was shot down.
President Reagan’s altruistic directive, which opened the military’s GPS to the world, provided an amazing opportunity to the private sector that is experiencing its second act 30 years later in the Government 2.0 ecosystem of open data.
The decision to open up GPS provided the ability to create sophisticated navigation systems to prevent future disasters.
The unforeseen consequence of President Reagan’s move was the creation a $250 billion a year navigation industry (including GPS enabled smartphones), millions of jobs, and inspiration to spur the next generation of innovation and economic prosperity in the US.
- source : Techwire -

That glowing blue dot exists because of a series of executive decisions made by Presidents Ronald Reagan and Bill Clinton, who decided to progressively open up the data created by the satellites in the Global Positioning System to civilian use, enabling a huge number of location-based technologies to make their way into the palms of citizens around the world.

Now, we may see even more life-changing technologies as a result of open government data.
Last week, the White House released an executive order that makes “open and machine readable” the new default for the release of government information.
Although people who care about open data were generally quite excited, the news barely made an impression on the general public.
But it should: This is perhaps the biggest step forward to date in making government data—that information your tax dollars pay for—accessible for citizens, entrepreneurs, politicians, and others.

Online free NOAA nautical charts and publications open data/open access.
(since November 15th, 2005)
Before the Obama executive order, the openness of this kind of data has been threatened
by the U.S. House of Representatives, 
as they explore privatization of NOAA services.

President Barack Obama announced the order on a trip to Austin, Texas, where he met the founder of StormPulse, a startup that uses weather data for risk analysis.
The White House also published a memorandum that established a framework to institutionalize the treatment of government information as an asset.
"This kind of innovation and ingenuity has the potential to transform the way we do almost everything," said Obama.

 MATCH incorporates metadata from six federal agencies’ datasets.

This isn't the first time the nation has heard this kind of rhetoric or initiative, although it was by far the most prominent mention by the president to date.
In 2009, the federal government launched Data.gov as a platform for open data for civic services and economic reuse.
In the years since, dozens of other national and state governments have launched their own open data platforms.
From health information to consumer finance, government data are slowly making their way out of file cabinets and mainframes into forms through which they can be put to good use.
Many of these data are of fundamental interest to citizens, from the quality of the food we eat to the efficiency of our appliances to the safety of the cars we drive.
During Hurricane Sandy, open government data feeds became critical infrastructure, feeding into crisis centers and media maps that amplify them to millions of citizens searching for accurate, actionable information.

While all those efforts laid a foundation, the new executive order is at once more legally binding and specific.
It sends a clear statement from the top that open and machine-readable should be the default for government information.

The White House has also, critically, taken steps to operationalize these open data principles by:
  • Mandating that when an agency procures a new computer or system that collects data, those data must be exportable. That won't address digitizing existing government documents and data but will create a default setting going forward.
  • Planning to relaunch data.gov in a format compatible with dozens of other open-data platforms around the world.
  • Requiring agencies to catalog what data they have. Understanding what you have is fundamental to managing information as an asset, although an open data policy that requires creating and maintaining an enterprise data inventory won't be without cost. Creating a public list of agency data assets based upon audits is one of the most important aspects of the new open data policy.
With this executive order, the president and his advisers have focused on using open data for entrepreneurship, innovation, and scientific discovery.
This executive order, associated tools, and policy won't in and of themselves be enough to achieve the administration's goals, at least with respect to jobs: They'll need entrepreneurs, developers, and venture capitalists to put the open data to use.
Governments looking for economic return on investment must focus on open data with business value, according to research from Deloitte U.K.

Government release of health, energy, education, transit, and safety data all hold significant economic potential.
As is the case with GPS and weather data, however, government will have to ensure that data remains available to businesses founded upon it.

But advocates of open data also point to another area with great potential: transparency.
With Data.gov, the Obama administration had promised to make information available so citizens could keep an eye on things.
But some experts in this space are worried that with the emphasis on innovation and economic growth, the transparency element will be forgotten.
The nation's media relies upon Freedom of Information requests and confidential sources, not Data.gov.
Jim Harper, director of information studies at the Cato Institute, praised President Obama’s new open data policy but questioned its relationship to government transparency.
He writes:
“Government transparency is not produced by making interesting data sets available. It’s produced by publishing data about the government’s deliberations, management, and results. Today’s releases make few, if any, nods to that priority. They don’t go to the heart of transparency, but threaten to draw attention away from the fact that basic data about our government, including things as fundamental as the organization of the executive branch of government, are not available as open data.”

These are important questions that the Obama administration must address in the months ahead, although it is, admittedly, a little busy this week.
Still, the order has the potential to revolutionize industries, giving people better tools to navigate the world.
While the impact of open government data on democracy depends on functional institutions, the rule of law, political agency, and press freedom, its impact on the economy could measure in the hundreds of billions over time.

"This memorandum is the most significant advance in information policies by the federal government since the passage of the Freedom of Information Act,” said open government advocate Carl Malamud, president of PublicResource.Org.
Government data is a new kind of natural resource that can now be tapped and applied to the public good.

Links :
  • NOAA NCDC open access to physical Climate Data policy (2009)
  • NOAA : Technology & Data : NOAA and Partners Deliver New Climate and Health Data Tool to Public
  • NOAA : Assessing the economic & social benefits of NOAA data
  • Slashdot : President Obama: U.S. Government will make data more open
  • Climate Central : NOAA Head: Weather forecasts at risk over budget cuts
  • NOAA : Statement from Dr. Kathryn Sullivan on NOAA’s FY 2014 Budget Request



Wednesday, May 15, 2013

Was Darwin wrong about coral atolls?

A satellite image of Maupiti, one of the Society Islands, which is on its way to becoming an atoll. Submerged reef appears in pale blue.
>>> geolocalization with the Marine GeoGarage <<<
CREDIT: NASA Earth Observatory



From LiveScience

Charles Darwin sparked more than one controversy over the natural progression of life.
One such case involved the evolution of coral atolls, the ring-shaped coral reefs that surround submerged tropical islands.

Coral reefs are actually huge colonies of tiny animals that need sunlight to grow.
After seeing a reef encircling Moorea, near Tahiti, Darwin came up with his theory that coral atolls grow as reefs stretch toward sunlight while ocean islands slowly sink beneath the sea surface. (Cooling ocean crust, combined with the weight of massive islands, causes the islands to sink.)

A century-long controversy ensued after Darwin published his theory in 1842, because some scientists thought the atolls were simply a thin veneer of coral, not many thousands of feet thick as Darwin proposed.
Deep drilling on reefs finally confirmed Darwin's model in 1953.

But reef-building is more complex than Darwin thought, according to a new study published May 9 in the journal Geology.
Although subsidence does play a role, a computer model found seesawing sea levels, which rise and fall with glacial cycles, are the primary driving force behind the striking patterns seen at islands today.
"Darwin actually got it mostly right, which is pretty amazing," said Taylor Perron, the study’s co-author and a geologist at MIT. However, there’s one part Darwin missed. "He didn't know about these glacially induced sea-level cycles," Perron told OurAmazingPlanet.

What happens when sea-level shifts get thrown into the mix?
Consider Hawaii as an example.
Coral grows slowly there, because the ocean is colder than in the tropics.
When sea level is at its lowest, the Big Island builds up a nice little reef terrace, like a fringe of hair on a balding pate.
But the volcano — one of the tallest mountains in the world, if measured from the seafloor — is also quickly sinking.
Add the speedy sea-level rise when glaciers melt, and Hawaii's corals just can't keep up.
The reefs drown each time sea level rises.

The computer model accounts for the wide array of coral reefs seen at islands around the world — a variety Darwin's model can't explain, the researchers said.
"You can explain a lot of the variety you see just by combining these various processes — the sinking of islands, the growth of reefs, and the last few million years of sea level going up and down rather dramatically," Perron told OurAmazingPlanet.
For nearly 4 million years, Earth has cycled through global chills, when big glaciers suck up water from the oceans, and swings to sweltering temperatures that melt the ice, quickly raising sea level.
This cyclic growth of ice sheets takes about 100,000 years.
The researchers also found that one of the few places in the world where sinking islands and sea-level rise create perfect atolls is the Society Islands, where Darwin made his historic observations.