Thursday, June 21, 2012

Image of the week : Summer comes to Canada's Hudson Bay

NASA acquired April 6, 2012

From OurAmazingPlanet

The amount of ice in Arctic waters waxes and wanes with the change of the seasons, though some ice persists in the Arctic Ocean even throughout the summer.
But in Canada's Hudson Bay, sea ice can completely melt out during the summer months.

>>> geolocalization with the Marine GeoGarage <<<

A NASA satellite has caught the melt of ice in the bay during this spring, showing the dramatic shifts that the changing of seasons can cause.

 NASA acquired June 5, 2012

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Aqua satellite snapped images of the southeastern corner of Hudson Bay on April 6 (top), and June 5 (bottom).
The images have been rotated and north is at right.

In the April image, snow blankets most of the land around this corner of the bay, and sea ice covers most of the water.
The ice isn't a solid sheet, instead, chunks of ice of varying sizes and shapes drift around the bay with the prevailing winds and water currents.
Pieces of dark ocean water are visible near the shore where the winds have pushed the ice away.

In the June image, snow has melted and ice has retreated, leaving Akimiski Island and the Belcher Islands in the bay easier to spot.
The ice has a bluish tint to it, likely because it is waterlogged and melted ice has pooled in ponds on the ice's surface.
Sea ice will sometimes melt out completely in the bay during July.

Interestingly, ice has moved into some areas, for instance south and west of the Belcher Islands, where it had not appeared in early April.
The ice isn't spreading, it's simply moving and, broken into small pieces, it can drift easily.
Unlike two months earlier, areas of open water are the result of ice melt.

The ice in Hudson Bay has been melting earlier each spring since the 1970s.
The trend has been strongest in the western portions of the bay.

A 2011 modeling study published in the journal Climate Dynamics suggested that in the future, the duration of ice-covered conditions could be reduced by seven to nine weeks per year.
The changes were likely to be the most pronounced in southeastern Hudson Bay and James Bay, according to the model projections.

Wednesday, June 20, 2012

Global call to stop plastic pollution presented at Rio Earth Summit


From HuffingtonPost

When did everything become Plastic?

When I was a kid, we collected shells on the beach, not plastic trash.
There wasn't enough disposable plastic in those days for plastics to collect on the beaches.
Plastic bags came into heavy use in American grocery stores when I was in high school in the late '70s, early '80s.
By 2010, the Guinness Book of World Records named the plastic bag the decade's single most ubiquitous consumer item on the planet.

Slowly, over time, plastic packaging replaced cardboard, glass or metal to contain almost every item in the market.
The petrochemical packaging was lightweight and inexpensive.
It was cheaper to bottle soft drinks in plastic instead of glass.
Soon drink companies realized they could sell even plain tap water as a new alternative to soft drinks, conveniently packaged in plastic, for drinking on the go.
Since plastic was cheap, why not make disposable items out of it for big profits and market them as convenience items for busy people?
Why wash dishes, cups and tableware you could simply throw away?
Why buy a shaving device and replace the blade when you could buy one unit of plastic and metal and just throw the whole thing away when the blade gets dull?
The developed countries all joined the disposable plastic craze and soon the developing countries were importing and manufacturing the stuff too.


Plastic Overload

All this single use plastic packaging has led to a serious build up of plastic waste all around the globe.
Since plastic doesn't biodegrade, every bit of plastic ever made still exists either in a dump, as fill or fluff in another product, or in the environment.
Much of the plastic is of a type not designed to be recyclable.
Like bottle caps, this plastic is designed for immediate disposal -- feminine hygiene products, diapers, or fast food containers -- or is a hybrid product that can't be recycled for this reason (like the disposable razor or the Tetra Pack paper/plastic hybrid containers for liquids); or is not cost-effective to recycle like thin plastic bags or polystyrene.

Many communities in developed countries and most developing nations have no plastic recycling facilities at all. It's pretty clear that this is not a sustainable model.
This is easily confirmed by a visit to a garbage dump or a beach where there is no taxpayer-supported cleanup on a regular basis.
If we continue on the path of nonstop production of everlasting plastic waste, will we be buried in the stuff someday!
For a glimpse of this future see Alan Weisman's The World Without Us chapter on plastics: Polymers are Forever.

 Fishes made with plastic bottles on the Botafogo beach in Rio (photo Ueslei Marcelino/Reuters)

California Kids Take a Stand in the Sand

Beach Clean-ups organized by schools, local governments and NGOs are becoming a regular part of childhood for kids who live in coastal communities.
In the week preceding the UN designated World Oceans Day, more than 8000 California school children took part in beach cleanups to rid the sand of trash and then formed giant aerial images on five California beaches, each incorporating the text "Defend our Seas."
The largest of these images was a fierce shark with a spear and shield that was imagined by 11-year-old Breann Mancilla and reproduced on the sand with the help of more than 5,000 children.
The children's messages in the sand are shining a light on the huge quantities of plastic waste that are filling the oceans of the world.
Watch a video of Kids Ocean Day on Dockweiler Beach with aerial footage from a helicopter that is being shared with world leaders at the Rio Earth Summit this week.

The Great Pacific Garbage Patch formed gradually as a result of marine pollution gathered by oceanic currents.
The patch extends over an indeterminate area, with estimates ranging very widely.
It is very harmful for the wildlife cause some of these long-lasting plastics end up in the stomachs of marine birds and animals.

Plastic Pollution Message Delivered at Rio Earth Summit


With plastic waste overwhelming our disposal systems and ecosystems, environmentalists at the Rio Earth Summit are making the case for going back to the old ways of reusable goods and biodegradable packaging.
Natural Resources Defense Council and Plastic Pollution Coalition are presenting a commitment agreement for governments, businesses and NGOs to solve the plastic pollution crisis at the point of manufacture.
The Global Call to Stop Plastic Pollution can be viewed at www.stopplasticpollution.org.
Some of the plastic pollution focused events at the Rio Earth Summit are the following: Health Impacts of Plastics on Mothers and Children and Plasticity Forum.

The theme of The Rio Earth Summit is "The Future We Want."

Here's to a future with clean beaches and oceans where children will once again be awed by shells and sea creatures, not the remnants of careless consumption.

Links :
  • NRDC : Local Victories to End Plastic Pollution and Protect our Oceans lead to Global Opportunity at Rio+20
  • CoastalCare : Plastic pollution

Tuesday, June 19, 2012

Google Maps adds England and Wales's waterways to travel routes

 The Oxford canal near Brinklow, Warwickshire (photo Nexapt)

From BBC

Google Maps users may soon find it easier to plan a trip on some of England and Wales's waterways.

The US search engine has teamed up with the Canal and River Trust, a charity that will be in charge of the two countries' water network from July.
The deal includes updating Google Maps to include 2,000 miles of canal and river paths.

The charity's website site includes a Google Map guide to the UK's canal network
called In Your Area
The map allows users to enter their address or postcode and discover their nearest canal.
The map shows the locations of canals, canal locks and bridges.
The map also displays other useful information, such as volunteering opportunities, places to eat and drink and boating services and moorings.
Google are also working with the Canal and River Trust to capture Street View imagery of the UK's canal and river network.

Currently, waterways are not listed on Google Maps as active routes people can use to move about. "Say, I'm by a canal in Paddington and I want to go to Camden, and I put this information into Google Maps as a walking route - it wouldn't send me to the canal, even though it's a nice green route to get there, it would send me by road," the Trust's spokesman Jonathan Ludford told the BBC.

The charity will be working with Google to identify all the access points to the waterways, as well as all the bridges and tunnels, he added.
"It's a very exciting project - Google is basically putting the canal network of England and Wales on the map, and people will be able to put in a route and if it's appropriate to go by canal, they would go by canal," he said. "

A lot of people live by canals, and we want them to use these canals - so to have Google promoting the waterways is a really exciting initiative."
Once the data is on Google Maps, waterways will become alternative, possibly traffic-free, routes through towns and cities of England and Wales.
"Canal towpaths offer green routes through our towns and cities, and by working with the Canal and River Trust we're adding towpaths to Google Maps and encouraging people to discover their local waterway," said Ed Parsons, geospatial technologist at Google UK.

Links :

Acidifying ocean threatens California coast

nimation of changes in ocean acidification over time in the California Current System
The left side shows the depth of the saturation horizon with regard to the CaCO3 mineral aragonite, and the right side shows the surface ocean pH. 


Humanity's use of fossil fuels sends 35 billion metric tons of carbon dioxide into the atmosphere every year.
That has already begun to change the fundamental chemistry of the world's oceans, steadily making them more acidic.
Now, a new high resolution computer model reveals that over the next 4 decades, rising ocean acidity will likely have profound impacts on waters off the West Coast of the United States, home to one of the world's most diverse marine ecosystems and most important commercial fisheries.
These impacts have the potential to upend the entire marine ecosystem and affect millions of people dependent upon it for food and jobs.

About one-third of the carbon dioxide (CO2) humans pump into the atmosphere eventually diffuses into the surface layer of the ocean.
There, it reacts with water to create carbonic acid and release positively charged hydrogen ions that increase the acidity of the ocean.
Since preindustrial times, ocean acidity has increased by 30%.
By 2100, ocean acidity is expected to rise by as much as another 150%.

Declining pH of seawater reduces the amount of carbonate ions in the water, which many shell-building organisms combine with calcium to create the calcium carbonate that they use to build their shells and skeletons.
The lower carbonate availability, in turn, decreases a measure known as the saturation state of aragonite, an easily dissolvable mineral form of calcium carbonate that organisms such as oyster larvae rely on to build their shells.
If the aragonite saturation state falls below a value of 1, a condition known as undersaturation, all calcium carbonate shells will dissolve.
But trouble starts well before that.
If the aragonite saturation state falls below 1.5, some organisms such as oyster larvae are unable to harvest enough aragonite to build shells during the first days of their lives, and they typically succumb quickly.

Live Chat: The Science of Organ Transplantation Thursday 3 p.m. EDT
These changes are particularly worrisome for global ocean regions known as eastern boundary upwelling zones.
In these regions, such as those along much of the West Coast of the United States, winds push surface water away from the shore, causing water from the deep ocean to well up.
This water typically already has naturally high levels of dissolved CO2, produced by microbes that eat decaying algae and other organic matter and then respire CO2.
Along the central Oregon coast, for example, when summer winds blow surface ocean waters offshore, a measure of the amount of CO2 in the water known a partial pressure rises from a few hundred to over 2000, causing ocean acidity to spike.

But oceanographers still didn't have a good handle on how rising atmospheric CO2 levels would interact with CO2 rich waters that upwell naturally.
So for their current study, researchers led by Nicolas Gruber, an ocean biogeochemist at the Swiss Federal Institute of Technology in Zurich, decided to look closely at what's likely to happen in an upwelling region known as the California Current System off the West Coast of the United States.
They constructed a regional ocean model that ties together what's going on in the atmosphere and the ocean.
Because this model focused on the California Current System, Gruber and colleagues were able to give it a resolution 400 times that of conventional global ocean models.
In their model, the Swiss team considered different scenarios of CO2 emissions over the next 4 decades and linked these to CO2 produced in the ocean due to respiration.

The buildup of atmospheric CO2 will rapidly increase the amount of undersaturated waters in the upper 60 meters of ocean, where most organisms live, the team reports online today in Science.
Prior to industrialization, undersaturation conditions essentially did not exist at this top layer in the ocean.
Today, Gruber says, undersaturation conditions exist approximately 2% to 4% of the time.
But by 2050, surface waters of the California Current System will be undersaturated for half of the year.

Perhaps just as bad, however, aragonite saturation will fall below 1.5 for large chunks of each year.
This could spell doom for Pacific oysters, a $110 million-per-year industry on the West Coast, as well as for other shell-building organisms that are sensitive to changes in ocean acidity, says Sue Cudd, owner of the Whiskey Creek Shellfish Hatchery on Netarts Bay in Oregon.
Another species likely to face difficulty are tiny sea snails known as pteropods, which are a vital food source for young salmon.

The new results are "alarming," says Richard Feely, a chemical oceanographer at the National Oceanic and Atmospheric Administration's Pacific Marine Environmental Laboratory in Seattle, Washington.
"It's dramatic how fast these changes will take place."

George Waldbusser, an ocean ecologist and biogeochemist at Oregon State University, Corvallis, says it's not clear precisely how rising acidity will affect different organisms.
However, he adds, the changes will likely be broad-based.
"It shows us that the windows of opportunity for organisms to succeed get smaller and smaller. It will probably have important effects on fisheries, food supply, and general ocean ecology."

Links :

France SHOM update in the Marine GeoGarage

113 charts have been withdrawn since the last update :

  • 278    Environs de Raguse (Dubrovnik) Gravosa (Gruz), Raguse (Dubrovnik), Breno (Zulski)  
  • 280    Golfe de Cattaro   
  • 1292    Carte du Golfe de Smyrne et de ses abords   
  • 1456    Carte de la partie septentrionale de l'Archipel (Grèce)   
  • 1490    Entrée des Dardanelles, golfe d' Adramyti, îles de Mitylène, Tenedos, Lemnos et Strati   
  • 1700    Baie de Tétouan   
  • 2040    Du Grand Banc des Mosquitos à la Passe Windward   
  • 2089    Carte des Canaux d'Egripo, de Talante et d'Oréos, et de l'île de Négrepont   
  • 2114    Mer des Caraïbes Bassin Nord-Ouest  
  • 2122    De l'île d'Elbe à Naples   
  • 2463    Madère, Porto Santo, îles Désertes   
  • 2662    Canal d'Otrante   
  • 3453    De la Pointe Rossello à la Pointe Scalambri   
  • 3470    De Mazzara à Agrigento, île Pantellaria   
  • 3534    Port de Trieste et Baie San Bartolomeo   
  • 3684    De Trapani à Marsala et îles adjacentes   
  • 3731    Du Cap Cefalu à Mazzara   
  • 3757    De Taormina au Cap Cefalu (Ilipari Détroit de Messine)   
  • 3790    Sicile, du Cap Scalambri à l'entrée Sud du Détroit de Messine   
  • 3975    Mer Adriatique Partie Nord  
  • 3976    Mer Adriatique Partie Sud  
  • 3978    Abords et entrée des Dardanelles   
  • 3992    D'Ancône à Ortona   
  • 4004    D'Ortona à Barletta   
  • 4005    De Barletta à Brindisi   
  • 4030    Entrée du Golfe de Tarente   
  • 4044    Golfe de Tarente   
  • 4071    De Crotone au Cap Spartivento   
  • 4212    Port Conte et rade d'Alghero   
  • 4229    Golfe d'Asinara   
  • 4256    Bouches de Cattaro (Kotor) et côtes environnantes   
  • 4646    Du Cap Palinuro au Cap Vaticano   
  • 4798    Golfe de Volo et ses abords   
  • 4845    Du Cap Mesurado à la Pointe Baffu   
  • 4850    Du Cap Sainte-Anne au Cap Mesurado   
  • 5023    Iles au Sud de la Sicile   
  • 5220    Ports de la côte Est d'Italie   
  • 5365    Du Guadalquivir au Cap Trafalgar   
  • 5441    Plans à la côte Nord-Ouest d'Espagne Baie de Corcubion  
  • 5700    Port du Pirée et Baie de Phalère Port Héraclée  
  • 5793    Abords de Pola   
  • 5796    Du Cap Nord au Cap Tchéliouskine   
  • 5798    Yougoslavie   
  • 5820    Groupe Santorin   
  • 5834    Iles du Cap Vert   
  • 5923    Abords d'Alexandrie   
  • 5941    Des îles de Los à l'île Sherbro   
  • 6014    De la terre Peary au Scoresby Sound et de Trondheim au Cap Nord   
  • 6015    Des passages du Nord-Ouest à la Mer du Groenland   
  • 6118    Iles Saint-Pierre et Miquelon   
  • 6214    Grande Canarie   
  • 6269    De Meregh à Merca   
  • 6270    De Merca à Chisimaio   
  • 6293    Port de Kinsale Port Oyster  
  • 6341    Anse de Mazarron Ports de Aguilas et El Hornillo  
  • 6342    Cours du Guadalquivir De l'embouchure à Séville  
  • 6375    Port de Pasajes   
  • 6376    Du Cap Gracias à Dios au Cap de la Aguja   
  • 6381    Ports de la côte Nord d'Espagne   
  • 6383    Ports de la côte Nord d'Espagne   
  • 6384    Port de Civitavecchia   
  • 6453    Fleuve Congo De l'embouchure à Quissanga  
  • 6517    Du Cap Guardafui à Mogadiscio   
  • 6569    Mer d'Alboran Feuille Nord  
  • 6570    Mer d'Alboran, feuille Sud   
  • 6606    Canal de Sicile   
  • 6611    Entrée de la Méditerranée Côte d'Espagne de Huelva au Cap de Palos et côte d'Afrique de Mehdia au Cap Ferrat  
  • 6644    Ports et mouillages d'Angola   
  • 6766    Bassin d'Arcachon   
  • 6771    De l'Ecosse (Scotland) à l'Islande (Island)   
  • 6878    Golfe de Suez De Râs Ghârib au port de Suez  
  • 6908    Détroits de Jubal et de Tīrān   
  • 6978    Golfe d'Aqaba   
  • 6979    Mer Rouge, côte du Soudan   
  • 6982    Des îles Farasān à Hodeida (al Hudaydah)   
  • 6983    Accès à Mits'iwa (Massawa)(partie Nord)   
  • 6995    Approches de Sines   
  • 7013    Baie de Suez (Bahr al Qulzum)   
  • 7020    Ports du Golfe de Gênes (Genova)   
  • 7062    Ports du Golfe de Guinée   
  • 7071    Port de Mits'iwa (Massawa)   
  • 7099    Mer Rouge Partie Sud De l'archipel Sawākin aux îles Hanīsh 
  • 7103    Kolpos Elevsinas   
  • 7111    Approches de Hodeida (al Ḩudaydah)
  • 7112    Mer Rouge - Partie centrale - De Abū el Kizân à l'archipel Sawākin
  • 7113    Mer Rouge - Partie Nord - De Râs Muhammad à Abū el Kizân
  • 7114    Ibiza et Formentera   
  • 7115    Mallorca Partie Ouest De Punta Beca à Punta Salinas 
  • 7116    Mallorca Partie Est De Punta Salinas à Cabo de Formentor 
  • 7117    Menorca Ports et mouillages de Menorca  
  • 7118    Abords de Palma De Isla Dragonera à Cabo Blanco  
  • 7119    Ports et mouillages de Mallorca et Cabrera   
  • 7165    Ile Maurice   
  • 7169    Ports de Chypre   
  • 7219    Ports de Libye   
  • 7245    Ports et mouillages en Mer de Marmara   
  • 7253    Golfe de Corinthe (Korinthiakós Kólpos) - Golfe de Pátras (Patraïkós Kólpos)
  • 7254    Golfe d'Athènes (Saronikós Kólpos)
  • 7256    INT 3608 De Soûr à Al Arish
  • 7263    Iles Cyclades (Kikládhes Nísoi) - Partie Ouest
  • 7264    Iles Cyclades (Kikládhes Nisoi) - Partie Est
  • 7284    De Argolikós Kólpos à Níos Póros
  • 7295    Ports et mouillages entre Cabo de la Nao et Cabo de Palos   
  • 7298    Ports et mouillages entre la frontière franco-espagnole et Tarragona   
  • 7339    Malta et Ghawdex   
  • 7342    De Nísos Sými à Kaş - Nísos Ródos
  • 7473    De Florida à Cuba Bahamas Islands  
  • 7474    De Cuba à Puerto Rico   
  • 7476    Mer des Caraïbes Partie centrale  
  • 7486    INT 7055 Canal du Mozambique Partie Nord 
  • 7518    INT 7118 De Al Ḩudaydah à Al Mukhā
  • 7702    INT 1973 De Sidi Al Hachmi à Mohammadia  
  • 7704    De la pointe Malabata à Sidi Al Hachmi    


and 73 charts have been added :

  • 1988    Entrées du Golfe du Mexique Banc de Campêche   
  • 3698    Iles Comores Grande Comore et Mohéli   
  • 3865    De l'île Hon Tseu au Cap Lay    
  • 4086    Al Mahdiyah    
  • 4087    Tabarca    
  • 4102    Sousse    
  • 4183    Tunisie côte Est Ports et mouillages   
  • 4238    Sfax    
  • 4245    De Sidi Garus à Zarzis, Bahiret el Bou Grara    
  • 4247    De Zarzis au Ras Ashdir (Bahiret el Biban)    
  • 4379    De la Baie Ampasindava à Nosy Saba Ile et port Radama   
  • 4696    Baie de Diego-Suarez    
  • 4697    Baie de Diego-Suarez    
  • 4806    Iles Comores Anjouan   
  • 4858    De Nosy Valiha à la Pointe Ambatomifoko    
  • 4861    De la Pointe Marolahy à la Pointe Maromanjo Baie de Mahajamba   
  • 4912    Baie de Baly    
  • 4933    Du Cap Tanjona au Cap Saint-André    
  • 5241    Baie d'Ambavatoby    
  • 5264    De la Pointe d'Andemby à la Pointe d'Angadoka Abords de Nossi-Bé   
  • 5294    Du Cap Saint-André à Majunga    
  • 5339    De Majunga à Nossi-Bé    
  • 5363    Abords d'Analalava    
  • 5367    Maintirano et ses abords    
  • 5404    De la rivière Sahinana à la Pointe d'Andemby Iles Mitsio   
  • 5427    Baie de Cam-Ranh    
  • 5476    De la Baie du Courrier à la Baie du Rodo    
  • 5483    Mouillage de Farafangana    
  • 5506    Du Cap Kimby au Cap Saint André    
  • 5509    Du Cap Padaran à la Baie de Cam-Ranh    
  • 5549    De la Baie d'Halong à Pak-Ha-Mun    
  • 5559    Chenaux entre Quang-Yen et la Baie d'Halong    
  • 5652    Grande Baie des Faï Tsi Long    
  • 5676    Abords de Poulo Condore et embouchure du Bassac    
  • 5691    Annam et Cochinchine    
  • 5696    Port de Mostaganem    
  • 5699    Port de Tipaza et Baie de Chenoua    
  • 5708    Port de Ténès    
  • 5797    Mananjary    
  • 5809    Du Cap Varella à l'île Nuoc    
  • 5884    Rivière de Sinnamary    
  • 5886    Iles Habibas    
  • 5892    De la Pointe Samit à Tian-Moi (Ile à l'Eau) Koh Prins, Koh Tang, Poulo Wai   
  • 5899    De Hon-Tseu à Hon-Matt    
  • 5942    Iles et récifs de Cani    
  • 5949    Mouillages à la côte Est de Madagascar    
  • 6064    Mouillage de Soalary    
  • 6070    Port de Sidi-Abdallah    
  • 6075    Du Cap des Palmes à Grand-Béréby    
  • 6136    Cours de la Casamance De la Pointe Samis à Ziguinchor   
  • 6153    D'Antalaha au Cap Masoala    
  • 6230    Mouillage de Morondava    
  • 6233    Abords de Morondava    
  • 6235    Abords de Belo-sur-Mer    
  • 6307    Côte Est de Madagascar Mouillages   
  • 6309    Baie d'Antongil, abords de Maroantsetra    
  • 6316    De l'île Sainte-Marie à Fénérive    
  • 6317    De Fénérive à Foulpointe    
  • 6343    Mouillage de Morombe    
  • 6346    Abords Sud de Morombe    
  • 6354    De Nosy Andriamitaroka à Morombe    
  • 6378    Port de Libreville    
  • 6419    Grand Basha (Tolou)    
  • 6437    Abords Nord d'Andevoranto    
  • 6539    Abords d'Antalaha    
  • 6595    Mouillages de la côte Est de Madagascar    
  • 7428    Bassin d'Arcachon    
  • 7514    INT 3671 Ports du Liban   
  • 7587    INT 2881 Port de Lomé - Rade de Kpémé - Port de Cotonou
  • 7588    Côtes du Gabon et du Congo - de Gamba à Pointe Noire
  • 7591    INT 901 De Cape Goodenough à Cape Adare   
  • 7751    Île Clipperton - Zone Economique Exclusive
so 620 charts from SHOM are displayed in the Marine GeoGarage