Tuesday, December 18, 2012

Vendée Globe : South East Cape, from Indian to Pacific Ocean

Situation 18/12 11:00 UTC
Armel and François crossed the longitude of South East Cape :
welcome to the Pacific Ocean

South of Tasmania
>>> geolocalization with the Marine GeoGarage <<<

The surface of the planet is approximately 71% water and contains (5) five oceans, including the Arctic, Atlantic, Indian, Pacific and Southern.
For many years only (4) four oceans were officially recognized, and then in the spring of 2000, the International Hydrographic Organization established the Southern Ocean, and determined its limits.
(see About.com)
 Those limits include all water below 60 degrees south, and some of it, like the Arctic Ocean, is frozen.

The question of defining the oceanic limits of the Indian Ocean is complicated and remains unsettled.
The clearest border and the one most generally agreed upon is that with the Atlantic Ocean, which runs from Cape Agulhas, at the southern tip of Africa, due south along the 20° E meridian to the shores of Antarctica.

 South East Cape

The border with the Pacific Ocean to the southeast is usually drawn from South East Cape the southernmost point of the main island of Tasmania (the southernmost state of Australia) down the 147° E meridian to Antarctica.

Bass Strait, between Tasmania and Australia, is considered by some to be part of the Indian Ocean and by others to be part of the Pacific...

There is no universal agreement on the southern limit of the Indian Ocean.
In general (and for the purposes of this article), it is defined as extending southward to the coast of Antarctica.
However, many—notably in Australia—consider the portion closest to Antarctica (along with the corresponding southern extensions of the Atlantic and Pacific) to be part of the Southern (or Antarctic) Ocean.
Australians often call the entire expanse south of that continent’s south coast the Southern Ocean.

South East Cape is one of the Five Southernmost Capes that can be rounded by Southern Ocean sailors : Cape of Good Hope (South Africa), Cape Leeuwin (West Australia), South East Cape of Tasmania, South West Cape of New Zealand and Cape Horn (South America).

 The Indian Ocean, according to the CIA The World Factbook (blue area), 
and as defined by the IHO (black outline - excluding marginal waterbodies)

Bounded by five continents, the Pacific Ocean is Earth’s largest feature—but it was generally unknown to Europeans until Spanish explorer Vasco Nuñez de Balboa sighted it in 1513 from a peak in Darién, Panama.
Later, Portuguese explorer Ferdinand Magellan sailed the Pacific on a Spanish expedition of world circumnavigation from 1519 to 1522.
Magellan called the ocean Pacífico or "Pacific" because he encountered calm seas throughout his journey.

Maris Pacifici by Ortelius (1589).
One of the first printed maps to show the Pacific Ocean

The Pacific Ocean is the largest ocean.
The Pacific Ocean covers 35% of the earth.
The Pacific Ocean is almost half of all the oceans, as big as the other four oceans combined.
As the earth spins around, there is a viewpoint from outer space where all you can see is the Pacific Ocean.

Links :
  • Princeton : The Pacific Ocean, 250 Years of Maps (1540–1789)
  • GeoGarage blog : Vendee Globe : welcome to the Land of the Albatross

How Arctic hurricanes help warm Europe

This is a beautiful polar low in the Barents Sea on the 20th of December 2002, with a characteristic eye and counter-clockwise swirl of clouds.
The grey area in the upper left-hand corner is sea ice.
’Polar low’ is the denomination of a wide range of weather phenomena at high latitudes.
Although many definitions have been proposed, the following one was given by Rasmussen and Turner in the book "Polar lows" from 2003:
A polar low is a small, but fairly intense maritime cyclone that forms poleward of the main baroclinic zone (the polar front or other major baroclinic zone).
The horizontal scale of the polar low is approximately between 200 and 1000 kilometres and surface winds near or above gale force.
A 'baroclinic zone' is a region with large local temperature differences, which are the primary source of 'fuel' for most cyclones outside the tropics ('extratropical cyclones').
Although we now know that polar lows can occur in both hemispheres (a polar low-like feature has even been observed over the Mediterranean), they were first noticed in the Nordic Seas, or more specifically along the coast of Norway.
Photo credit Erik Kolstad


Santa better have hurricane insurance.
Every year, there are thousands of cyclones in the Arctic, some with hurricane-force winds.
Before satellites spotted these storms, sailors would return from the North with tales of massive squalls appearing out of nowhere, creating waves up to 36 feet (11 meters) high.

A new study published online this week in the journal Nature Geoscience has found that these storms transport a significant amount of heat from the tropics to the Arctic and help power the Gulf Stream, the ocean current that shuttles warm water northeast from the Caribbean toward Europe.
The Gulf Stream keeps the continent warmer than it would otherwise be, said Alan Condron, study co-author and oceanographer at the University of Massachusetts at Amherst. 
These storms are technically known as polar lows but can be referred to as Arctic hurricanes, although that term usually refers to cyclones that form in the tropics.
Like hurricanes, though, polar lows can be incredibly intense, with winds above 74 mph (118 kph), and have a central "eye" with swirling bands of clouds, Condron told OurAmazingPlanet.
Unlike typical hurricanes, however, polar lows tend to be on average about 25 percent smaller in area and are shorter-lived, he said.

Short-lived but wide-ranging

Polar lows are created when masses of frigid air move over warmer water, which creates instability in the atmosphere.
That can lead to the development of small, strong storms powered by the transfer of heat from the ocean to the atmosphere, as well as by the interaction of warmer air to the north with cooler air to the south, said Kent Moore, an atmospheric physicist at the University of Toronto who wasn't involved in the research.
As the frigid air from one of these storms moves over the comparatively warmer water, the water cools and sinks. This sinking helps power the Gulf Stream, and more broadly, the global ocean conveyor belt, Condron said.
The storms "intensify the circulation of the ocean and are partly responsible for keeping Europe warm," he said.
Prior to this study, nobody had looked to see whether or not these brief cyclones — which usually last about 24 hours — might have a significant impact on the world's oceans and climate, Moore said.
"The authors were able to show these storms have a strong impact on ocean circulation," he said. "That's quite a surprising result since [the cyclones] are so short-lived." But thousands of short-lived storms add up, he added.

 A polar low over the Norwegian Sea: these polar storms can have hurricane-strength winds and are common over the polar North Atlantic, but are missing from climate prediction models due to their small size.
Credit : NEODAAS Dundee Satellite Receiving Station

Frigid winds 

The air within polar lows can often be as cold as minus 4 degrees Fahrenheit (minus 20 degrees Celsius).
They are capable of extracting 93 watts of heat per square foot (1,000 watts per square meter), enough to power two 45-watt light bulbs for every square foot of ocean surface, Moore said.
Condron estimates these Arctic hurricanes are responsible for about 5 percent of the heat transferred from the equator to the poles, he said.
He and his co-author Ian Renfrew, from the University of East Anglia in England, were able to create a computer model that accurately recreated these powerful storms.
Current climate models do not take the storm into account, which could lead to incomplete predictions, Condron said.
"These models may predict it will be too warm [to the south]," he said.
"If we can run models that include these polar lows, it will improve our future forecast."

Links :
  • Newswise : First Study of Climate Effects of Arctic Hurricanes 

Monday, December 17, 2012

Canada's territorial disputes

  Above, an interactive map takes you through six of Ottawa’s remaining boundary disagreements.

From TheGlobe&Mail 

The Canadian government still has several outstanding territorial disputes with foreign governments that may take several decades of delicate diplomacy to resolve.

An agreement on a decades-old maritime boundary dispute with Denmark could be a sign that Canada is serious about its plan to resolve competing claims in the north, researchers suggest.

Negotiators have a tentative plan to address ownership of two small patches of water totalling less than 225 square kilometres in the Lincoln Sea, an area of the Arctic Ocean north of Ellesmere Island and Greenland.
There is still, however, no resolution over Hans Island, as well as several boundary disputes with the United States in the Arctic and further south.

“What we’re seeing here is the Harper government signalling a willingness to resolve disputes with other Arctic countries, and that is very significant,” said Michael Byers, a professor at the University of British Columbia who holds a Canada Research Chair in global politics and international law.
As a shrinking polar ice cap opens up a wealth of economic opportunities in the Arctic, Dr. Byers and other researchers say there is new urgency for the federal government to firmly draw Canada’s boundaries.

The Arctic contains more than one-fifth of the world’s undiscovered energy resources, according to the U.S. Geological Survey.
While no one owns the area surrounding the North Pole, Canada is among several countries that have been working to map the floor of the Arctic Ocean to determine how much of the seabed they can lay claim to in the near future.

“We know that the north is going to become much, much busier, and with that increased activity we know that foreign interests are already showing a greater appreciation,” said Rob Huebert, associate director of the Centre for Military and Strategic Studies at the University of Calgary.

Under the United Nations Convention on the Law of the Sea, coastal countries are entitled to economic control over the waters that stretch as far as 200 nautical miles from their shores.
If a country can prove its continental shelf extends even further, it may be granted control of a greater expanse.

Canada’s claim is due by the end of next year and, depending on how far it stretches, could spark feuds with other northern countries.
Both Canada and Russia have said they believe the mineral and oil-rich Lomonosov Ridge, which runs beneath the ocean and close to the geographic North Pole, is a natural extension of their continental shelves.

Arctic Ocean bathymetric features

“There’s a real possibility that we will have a 200-nautical-mile overlap with the Russians,” Dr. Huebert said. Canada has said it would deal with any overlap through international dispute regulation mechanisms, he said, “But we’ve never had a boundary dispute with the Russians, so that would be a new sort of foreign policy issue that we’re facing.”

Hans Island


From North to South : Hans island, Franklin island and Crozier island
>>> geolocalization with the Marine GeoGarage <<<

Who: Canada vs. Denmark.
What: A small, uninhabited island in the Kennedy Channel, which runs between Ellesmere Island and Greenland.
How big: The island is 1.3 square kilometres.


Why: In 1973, Canada and Denmark negotiated a treaty that divided the maritime boundary between the two countries using the principle of equidistance.
But negotiators could not agree on what to do with Hans Island, which lay directly in the path of the boundary line they were drawing.
To avoid slowing the process down, they drew the line up to either side of the island’s shores, putting the land mass itself aside for future negotiations.
After several years of tensions that saw competing flag-planting expeditions and heightened rhetoric, the two countries signed a joint statement in 2005 committing to continued negotiations and promising to inform one another in advance of any planned activities related to the island.
The island has no direct economic value, but neither country wants to give up its claim, largely out of fear that doing so could jeopardize other Arctic claims, Dr. Huebert said.
“Everyone says how insignificant it is,” he said. “But I always come back to the point: if it was so simple, and so easy, why haven’t we settled it?”
Canada calls this dispute “well-managed,” and meets regularly with Denmark to discuss ways forward. “We are talking very constructively to each other,” Danish ambassador Erik Vilstrup Lorenzen said in a recent interview.
He said there are several possibilities for a “mutually agreeable” solution, but declined to describe the options the two countries are considering.
Reports earlier this year that Canada and Denmark would split the island down the middle were tempered by the ambassador, who said that was one of a number of options under consideration.

List of areas disputed by Canada and the United States

The Beaufort Sea


Who: Canada vs. U.S.
What: A triangle-shaped section of the Arctic Ocean north of the Alaska/Yukon border.
How big: The area in question is roughly 21,000 square kilometres shaped in a triangle that extends from the Alaska-Yukon border to the edge of the U.S. and Canada’s exclusive economic zones.

NASA : Sea Ice Retreat in the Beaufort Sea

Why: Canada claims the 1825 Treaty of St. Petersburg – signed by Russia and the U.K. – puts the maritime boundary along the 141st meridian.
That treaty indicates that the meridian line should serve as the border between Alaska and the Yukon “as far as the frozen ocean.” Canada claims it should apply to the sea as well.
The U.S. says the boundary should be guided by the principle of equidistance, which would create a line that is perpendicular from the coast, and one that slants east of the line claimed by Canada. Oil-and-gas deposits in the Beaufort Sea mean the disputed territory is highly valuable to both countries – and could make this dispute the most difficult to resolve.
But if the continental shelf extends significantly beyond 200 nautical miles, resolving the dispute could become much easier, Dr. Byers said.
Using the U.S. equidistance principle, the maritime boundary slants to the east until it reaches the edge of the exclusive economic zone.
But if it were extended further, the presence of Banks Island in the Northwest Territories would push the U.S. boundary back towards the west and onto the other side of Canada’s preferred meridian boundary.
Dr. Byers, who co-authored a recent paper on the dispute with James Baker, said he believes the only reason the dispute hasn’t yet been resolved is that both governments are still collecting data about the outer limit of their extended continental shelves.
(The U.S. has not signed on to the International Convention on the Law of the Sea, but supports the treaty in principle.)
“I showed the map two years ago to [then foreign affairs minister] Lawrence Cannon, and a big smile went across his face,” Dr. Byers said. “He recognized it was a win-win.”

Dixon Entrance

Inside Passage (Near Dixon Entrance)
photo : NicholasRalph
Who: Canada vs. U.S.
What: The section of water between the Alaska panhandle and Haida Gwaii, formerly the Queen Charlotte Islands
How big: The disputed waters cover roughly 2,750 square kilometres.

 >>> geolocalization with the Marine GeoGarage <<<

Why: In 1903, an international tribunal set the southernmost land boundary for the Alaska panhandle. Canada argues the line the judges used to determine which land masses belonged to each country should also be used as the maritime boundary – leaving Canada with the entire Dixon Entrance.
The U.S. wants the waters to be divided equally between the two countries.
Donald McRae, a law professor at the University of Ottawa who worked on boundary water disputes for British Columbia in the 1970s, said it’s possible to find arguments that support both countries’ claims.
“The arguments are sort of evenly balanced,” he said. “There’s support on both sides rather than one being absolutely right and one being absolutely wrong.”

Juan de Fuca Strait

Lighthouse at Race Rocks, Strait of Juan de Fuca

Who: Canada vs. U.S.
What: The dispute is over a section of the Pacific Ocean to the west of the Juan de Fuca Strait, the body of water that runs between Vancouver Island and Washington State.
How big: Combined, the two sections of water total an area of about 50 square kilometres.

 >>> geolocalization with the Marine GeoGarage <<<

Why: Both countries have agreed on their shared maritime boundary inside the strait.
To the west of the strait, they each use the principle of equidistance to claim exclusive fishery zones, but calculate the line using different baselines.
The result is two main pockets of disputed water, one of which is in the area of the salmon- and halibut-rich Swiftsure Bank fishery.

Machias Seal Island


Who: Canada vs. U.S.
What: Machias Seal Island, a small, mainly uninhabited island in the Bay of Fundy and the Gulf of Maine, and some of the surrounding water.
How big: The island is six hectares and the maritime area in dispute is about 720 square kilometres.

 >>> geolocalization with the Marine GeoGarage <<<

Why: In the 1980s, Canada and the U.S. asked the International Court of Justice to resolve the maritime boundary that would separate Maine from New Brunswick and Nova Scotia.
But they deliberately excluded the area around Machias Seal Island and Gull Rock and North Rock, two islets nearby, which both countries say should be theirs.
The U.S. argument is bolstered by the proximity of the island to Maine.
New Brunswick has kept an active lighthouse on the island since 1832, and the Coast Guard has a navigational aid at North Rock.
The economic value of this island is minimal. It is mainly used by birdwatchers and researchers.
“Every now and then it crops up as an issue between the two parties, and then they just simply try to put aside because I don’t think either side is interested in dealing with it,” Prof. McRae said.

Sunday, December 16, 2012

Largest luxury sailing yacht to date 141m


Dream Symphony is a sail yacht that will be built by Dream Ship Victory shipyard in Turkey and is due for launch in 2014.
At 141m loa  (462'7"ft) she will be the largest sailing yacht ever built.
Dream Symphony will not only be the largest, but she will also be of all wood construction.
Ken Freivokh Design is responsible for her exterior and interior design and engineering by Dykstra & Partners

Links :
  • SailWorld : Yacht Review: wooden Dream Symphony to be the largest yacht ever

Saturday, December 15, 2012

Vendee Globe : Cape Leeuwin

Saturday 15th 04:00 UTC situation : the two leaders François Gabart and Armel Le Cléac'h
passed the longitude of SW Australia’s Cape Leeuwin,  the second of the course’s three Great Capes,
34 days 10h and 23 minutes after the departure, so 2 days 2h and 25 min better than 2004 best time


>>> geolocalization with the Marine GeoGarage <<<

Cape Leeuwin is the most south-westerly mainland point of the Australian Continent, in the state of Western Australia.

In Australia, the Cape is considered the point where the Indian Ocean meets the Southern Ocean.

Map of Australia (1863), showing the Southern Ocean lying immediately to the south of Australia.
cropped from Australasia map (National Library of Australia)

 Image showing detail of the National Library of Australia's copy of Hessel Gerritsz' 1627 map of the west coast of Australia
entitled "Caert van't Landt van d'Eendracht".
This detail shows a section of coastline discovered by the Leeuwin in 1622,
and subsequently referred to by the Dutch as 't Landt van de Leeuwin ("The Land of the Leeuwin")

The Royal Australian Navy's Leeuwin class survey vessel HMAS Leeuwin is named after the cape, which is named after the ship the Leeuwin, a Dutch galleon that charted some of the nearby coastline in 1622.
The south-west corner of Australia was subsequently referred to by the Dutch as 't Landt van de Leeuwin ("The Land of the Leeuwin") for a time, subsequently shortened to "Leeuwin's Land" by the English.
This name Leeuwin still survives in the name of Cape Leeuwin, the most south-westerly point of the Australian mainland, so named by Matthew Flinders a distinguished navigator and cartographer, who was the first to circumnavigate Australia and identify it as a continent in December 1801.

Where the Indian and Southern Oceans meet, stands Cape Leeuwin Lighthouse as a solitary sentinel.
First lit in 1896 with a range of 26 nautical miles and flashing every 7.5 seconds for .02 of a second.