Wednesday, December 18, 2013

The coldest place in the world identified by satellite



From NASA


What is the coldest place in the world?

It is a high ridge in Antarctica on the East Antarctic Plateau where temperatures in several hollows can dip below minus 133.6 degrees Fahrenheit (minus 92 degrees Celsius) on a clear winter night -- colder than the previous recorded low temperature.


Scientists at the National Snow and Ice Data Center made the discovery while analyzing the most detailed global surface temperature maps to date, developed with data from remote sensing satellites including the MODIS sensor on NASA's Aqua satellite, and the TIRS sensor on Landsat 8, a joint project of NASA and the U.S. Geological Survey (USGS).

The researchers analyzed 32 years of data from several satellite instruments that have mapped Antarctica's surface temperature.
Near a high ridge that runs from Dome Arugs to Dome Fuji, the scientists found clusters of pockets that have plummeted to record low temperatures dozens of times.
The lowest temperature the satellites detected -- minus 136 F (minus 93.2 C), on Aug. 10, 2010.

The new record is several degrees colder than the previous low of minus 128.6 F (minus 89.2 C), set in 1983 at the Russian Vostok Research Station in East Antarctica.
The coldest permanently inhabited place on Earth is northeastern Siberia, where temperatures dropped to a bone-chilling 90 degrees below zero F (minus 67.8 C) in the towns of Verkhoyansk (in 1892) and Oimekon (in 1933).



At the coldest spots on Earth, every breath is painful.
But how cold can it get on Earth's surface?
What sort of weather brings on the record-breaking cold?

On the high plateau of East Antarctica, there is a ridge along the ice sheet nearly 14,000 feet above sea level.
The dry atmosphere and the long, sunless winter months combine to make this the coldest place on earth.
Under the clear Antarctic night skies the snow surface radiates warmth into space, cooling the air just above the surface.
As the air cools, it gets denser and starts to slide down the slope off of the ridge.
It collects In small hollows just a little downhill and continues to be cooled as the snow in the hollow radiates away its small amount of warmth.

The MODIS sensor on NASA's Aqua satellite allowed researchers from the National Snow and Ice Data Center to find the coldest place on Earth.
By turning to the TIRS sensor on the NASA/USGS Landsat 8 satellite, with its higher spatial resolution, the scientists were able to confirm how the topography facilitates these record low temperatures.

Links :
  • BBC :  Coldest spot on Earth identified by satellite
  • Phys.org : Building a telescope in the coldest place on Earth

Tuesday, December 17, 2013

Canada CHS update in the Marine GeoGarage

As our public viewer is not yet available (currently under construction, upgrading to Google Maps API v3 as v2 is officially no more supported),
this info is primarily intended to our B2B customers which use our nautical charts layers in their own webmapping applications through our GeoGarage API.

48 charts have been updated (November 29, 2013) in the GeoGarage platform :
    • 1202 CAP ÉTERNITÉ À/TO SAINT-FULGENCE
    • 1209 SAINT-FULGENCE À / TO RIVIÈRE SHIPSHAW
    • 1226 MOUILLAGES ET INSTALLATIONS PORTUAIRES / ANCHORAGES AND HARBOURS INSTALLATIONS / HAUTE CÔTE-NORD
    • 1230 PLANS PÉNINSULE DE LA GASPÉSIE
    • 1315 QUÉBEC À/TO DONNACONA
    • 1316 PORT DE QUÉBEC
    • 1317 SAULT-AU-COCHON À/TO QUÉBEC
    • 1430 LAC SAINT-LOUIS
    • 1509A RIVIÈRES DES PRAIRIES
    • 1509B RIVIÈRES DES PRAIRIES
    • 1510A LAC DES DEUX MONTAGNES
    • 1510B LAC DES DEUX MONTAGNES
    • 2029A COUCHICHING LOCK TO BIG CHUTE / ÉCLUSE DE COUCHICHING
    • 2029B BIG CHUTE TO / À PORT SEVERN
    • 2067 HAMILTON HARBOUR
    • 2100 LAKE ERIE / LAC ÉRIÉ
    • 2110 LONG POINT BAY
    • 2120 NIAGARA RIVER TO/À LONG POINT
    • 2283A OWEN SOUND TO/À GIANTS TOMB ISLAND
    • 2283B OWEN SOUND TO/À GIANTS TOMB ISLAND
    • 3443 Thetis Island To/À Nanaimo
    • 3475 PLANS - STUART CHANNEL
    • 3478 SANSUM NARROWS
    • 3490 FRASER RIVER/FLEUVE FRASER - SAND HEADS TO/À DOUGLAS ISLANDS BC
    • 3548 QUEEN CHARLOTTE STRAIT (CENTRAL PORTION/PARTIE CENTRALE)
    • 4012 YARMOUTH TO/À HALIFAX
    • 4013 HALIFAX TO / À SYDNEY
    • 4015 SYDNEY TO/À SAINT-PIERRE
    • 4022 CABOT STRAIT AND APPROACHES / DÉTROIT DE CABOT ET LES APPROCHES
    • 4233 CAPE CANSO TO / À COUNTRY ISLAND
    • 4235 BARREN ISLAND TO/À TAYLORS HEAD
    • 4236 TAYLORS HEAD TO/À SHUT-IN ISLAND
    • 4237 APPROACHES TO / APPROCHES DE HALIFAX HARBOUR
    • 4279 BRAS D'OR LAKE
    • 4281 CANSO HARBOUR AND APPROACHES / ET LES APPROCHES
    • 4308 ST. PETERS BAY TO/À STRAIT OF CANSO
    • 4320 EGG ISLAND TO / À WEST IRONBOUND ISLAND
    • 4363 CAPE SMOKEY TO/À ST PAUL ISLAND
    • 4385 CHEBUCTO HEAD TO/À BETTY ISLAND
    • 4406 TRYON SHOALS TO/À CAPE EGMONT
    • 4422 CARDIGAN BAY
    • 4432 ARCHIPEL DE MINGAN
    • 4450 SAINT PAUL ISLAND
    • 4641 PORT AUX BASQUES AND APPROACHES / ET LES APPROCHES
    • 4823 CAPE RAY TO\À GARIA BAY
    • 4921 PLANS-BAIE DES CHALEURS / CHALEUR BAY - CÔTE NORD / NORTH SHORE
    • 5505 BÉLANGER ISLAND À/TO COTTER ISLAND
    • 6206 SEVEN SISTERS FALLS TO/À SLAVE FALLS
      So 689 charts (1662 including sub-charts) are available in the Canada CHS layer. (see coverage)

      Note : don't forget to visit 'Notices to Mariners' published monthly and available from the Canadian Coast Guard both online or through a free hardcopy subscription service.
      This essential publication provides the latest information on changes to the aids to navigation system, as well as updates from CHS regarding CHS charts and publications.
      See also written Notices to Shipping and Navarea warnings : NOTSHIP

      Enric Sala: Saving the world's oceans one at a time

      Think of the ocean as our global savings account -- and right now, we're only making withdrawals, not deposits.
      Enric Sala shows how we can replenish our account through no-take marine reserves, with powerful ecological and economic benefits.

      From CNN

      When Enric Sala dips his toes in a pool of water, he does so in the knowledge he may well be the first man on the planet to do so.


      As he lowers himself below the surface of the ocean in his diving gear he becomes something of a fish whisperer, an underwater pied piper.
      In short, marine life flocks to the pony-tailed Spaniard.
      "It's an amazing experience to see fish that have never seen humans," he says.
      "They come really, really close to us. That's just unthinkable where people are fishing. Normally, we're used to them swimming away from us."
      "What we're doing is hard to do almost anywhere in the world. We're seeing large fish and sharks in almost every dive. People could spend years in, say, the Caribbean and see less sharks than we can in just one single dive. This latest trip has been a really, really special experience. It's so wild and we expected to see healthy reefs but not like this."

      National Geographic Pristine Seas Expeditions | Underwater message

      Sala is a novelty -- well, certainly to sea life -- with his passion for untouched waters as National Geographic's explorer-in-residence, whose mission is to help protect the last wild places in the ocean.
      The society's "Pristine Seas" initiative has been set up to fend off the long-distance fishing fleets that have started to encroach in these remote waters.

      Just 2% of the world's waters are protected, and Sala knows he has a gargantuan task ahead of him that needs massive backing by the world's governments.
      Slowly but surely he is chipping away at ensuring a better future for the world's waters.
      Of the eight areas he has so far visited under the program, four are now protected with a further two currently pending protection.

      His most recent expedition is to New Caledonia, an archipelago that separated from Australia 60-85 million years ago, coming to rest 1,210 kilometers east, and is now a special collectivity of France at the behest of Napoleon III, who ordered his navy to take formal possession of the 18,500 km².
       A day's boat ride north from New Caledonia's most northern tip, the Waitt's Institute research vessel has, until recently, been bobbing for the last three weeks slowly on the water's surface.
      A team of 12 people, made up of scientists, cameramen and crew, with Sala at the epicenter as expedition leader.
      Previously an academic, he recalls: "I was studying the effects of humans on the ocean. It was so depressing. I thought saving the ocean was a lost battle but then I decided I wanted to be part of the solution, so we started the Pristine Seas project.
      "Now I feel like there's hope. Now I go to these places and see what it used to be like, to see what the future could be elsewhere with regeneration."


      Sala's passion for all things underwater is addictive, he talks with a childlike enthusiasm for his current expedition.
      He was a boy when first captivated by the magic of the sea, inspired by the famous former diver and explorer Jacques Cousteau.
      "Since I can remember, my dream was to be a diver on his boat but I was born too late for that. But now I'm getting to do something similar myself. He showed us a lot and in later years showed us what was wrong with what we were doing. I'm trying to go one step beyond that and find solutions."
      So how would his idol have perceived what Sala and his team are now doing?
      "I think he would have been proud of what we're doing," says Sala, who grew up on the Spanish Mediterranean coast.
      "If he had lived on, I think he would have done something like this himself. But he was just an amazing man known by so many people around the world."

      Sala's current quest is aimed at not just protecting certain waters but regenerating those that have been fished to within an inch of their lives.
      The aim is to ensure protected areas become increasingly rich in fish and other underwater life, thereby spilling into other waters as it becomes overly abundant, thus in the long-term having a positive knock-on effect to fishermen.


      But he and his team are also learning about healthy coral and reef, among other things, to learn how to help regenerate damaged varieties in other global waters.
      Their days are spent diving, filming, photographing and researching.
      Sala, indeed, is most at home in the ocean.
      "Once in the water, all the problems on the surface disappear," he insists.
      "You're in a world where you're in complete focus but also at peace. It's a world where you don't feel the strong gravity from the planet, you feel like you're flying.
      "It completely changes your perspective on the world. I think it probably helps that endorphins are being released especially in these pristine places.
      "Being able to experience nature, and raw nature at that, first hand is like going back in the past. On these trips, it's like I go into a time machine and go back. It's quite spiritual."

      Sharks have become synonymous with fear in the sea, thanks in part to Steven Spielberg's "Jaws" film with John Williams' ominous stringed musical buildup to each unwitting victim of a shark attack.
      But Sala's experience of the underwater predators has been the complete antithesis.
      "Every moment is wonderful, like spending just one dive following clown fish for the whole dive," he says. "All the animals are special but the most special are sharks.
      "They are just so beautiful and elegant in the water. They're perfect in their environment and their shape has not really changed in 300 million years.
      "They are also great for the health of the reef, and the idea that they are dangerous is wrong. They have a bad reputation but in my five years doing this, diving sharks, I've not had one problem. I've never once been threatened by sharks."

      His long-term aim, and that of National Geographic, is to protect 20 seas in total. So how exactly can you protect large swathes of water?
      "It's become much easier as governments who we've worked with pass laws limiting the areas that can be fished," he explains.
      "Obviously some of these are in remote waters so the best way to do that is via satellite. For example in New Caledonia, we found out that the French Navy had intercepted an illegal Chinese fishing vessel. Having a naval presence is also a great deterrent."
      Next on his tick list is Mozambique in April.
      Slowly, sea by sea he is clearing up the planet's waters, and he is determined to continue.


      Monday, December 16, 2013

      Real-time world winds animated map

      A visualization of global weather conditions forecast by supercomputers updated every three hours
      created by Cameron Beccario (project under MIT license)
      animated picture : Dan Stuckey 

      This 'real time' app shows wind speeds...and among several map projections.


      Above: wind velocities at an altitude of 5,000 meters atop an Atlantis projection


      Weather Data | Global Forecast System (GFS model) : NCEP / US National Weather Service / NOAA
      (simple bilinear interpolation to fill the gaps)
      (with GRIB Decoder | UCAR/Unidata THREDDS)
      Geographic Data | Natural Earth
      Inspiration | HINT.FM wind map

      1000 hPa | ~100 m, surface conditions
       (zoom view via double click)

      The "earth" button also offers some options – changing the height (parameterized by pressure: e.g. the high-altitude 10 hPa pressure winds are more uniform, stronger, and red, purple, or even white if too strong), projection of the terrestrial sphere, changing the reference time (yesterday, forecast for tomorrow with date and time in the URL : earth.nullschool.net/#2013/12/18/0600Z/), UTC vs local time, visualizing your current location (a "cross" closes the local info), and more.
      Left-clicking a place (with no dragging) gives you some local wind speed and direction information about the place.

      Atmospheric pressure corresponds roughly to altitude
      several pressure surfaces are meteorologically interesting
      note: 1 hectopascal (hPa) ≡ 1 millibar (mb)

      so other layers :
        850 hPa | ~1,500 m, planetary boundary, low
        700 hPa | ~3,500 m, planetary boundary, high
        500 hPa | ~5,000 m, vorticity
        250 hPa | ~10,500 m, jet stream
          70 hPa | ~17,500 m, stratosphere
          10 hPa | ~26,500 m, even more stratosphere

       to beyond the stratosphere : the winds are fast, loopy and quite strange.


      Strong Storm in China, Korea and Japan this week-end illustrated by the new viewer

      Links :

      Sunday, December 15, 2013

      Amazônia Manauara


      A dive into the mysteries and beauty of Manaus, the capital in the heart of the Amazon.

      Links :
      • YouTube : Earth from Space (ESA) : Amazon