Saturday, October 27, 2012

Petermann Ice Island 2012 : on the move

Time-lapse imagery from July 9 to Sept. 13 2012 shows an ice island calve from Petermann Glacier and pass through Nares Strait.
source : NASA Goddard multimedia

This time-lapse video shows the calving of an ice island from Greenland's Petermann Glacier and the drifting of the ice down the fjord and southward through Nares Strait.
>>> geolocalization with the Marine GeoGarage <<<

The images were captured  by NASA's Terra and Aqua earth-observing satellites.
This is the second time in three years that a city-sized hunk of ice has ripped off from the glacier.

Links :
  • NASA : More Ice Breaks off of Petermann Glacier
  • TheGuardian : Greenland Petermann glacier calves huge iceberg - interactive
  • BBC : Petermann glacier in Greenland: Is it serious? 
  • GeoGarage blog : Satellites see unprecedented Greenland ice sheet surface

Friday, October 26, 2012

Bahamas WLP update in the Marine GeoGarage

24 charts have been updated since the last release :

  • B35 Ab-Fox Town
  • B166 Ab-Great Sale Cay & Propellor Bank
  • B85 Ab-Marsh Harbour
  • B174 Man O War to Whale -  Chartlet B
  • B122 Bimini Islands Chart
  • B112 Conception Island Overall
  • B128 Crk - Fortune Is. to Fish Cays
  • B123 Crk- French Wells
  • B273 Eleuthera - Sail Rocks to Finley Cay
  • B148 Grand Bahama Overall Chart
  • B224 Jumentos - Flamingo Cay
  • B210 Jumentos - Flamingo Cay to Great Exuma
  • B218 Jumentos - Hog Cay to Ragged Is.
  • B216 Jumentos - Johnson Cay to Hog Cay
  • B211 Jumentos - Man O War Cay to Nurse Channel
  • B217 Jumentos - Man O War Cays
  • B214 Jumentos - Nurse Cay to Raccoon Cay
  • B212 Jumentos - Nurse Cut to Nurse Cay
  • B215 Jumentos - Raccoon Cay to Johnson Cay
  • B219 Jumentos - Ragged Island
  • B203 East Plana Southeast Pt. Anchorage
  • B131 Plana Cays Overall
  • B262 Propeller Bay
  • B13 Bimini Harbours


    22 charts have been added since the last release :

    • B222 Ab- Schooner Bay
    • B33 Carters Cay to Fish Cays
    • B34 Strangers Cay  to Carters Cay
    • B32 Strangers Cut to Walkers Channel
    • B130 Acklins - South Acklins to Castle Island
    • B151 Crooked Island Northshore- Bird Rock to Majors Hrb.
    • B283 Eleuthera - Sail Rocks
    • B241 Gb- Sandy Cay
    • B153 New Providence - Albany Marina
    • B61 New Providence - Lyford Cay Marina
    • B240 Samana Cay Overall
    • B234 French Bay
    • B205 San Salvador Overall
    • B204 San Salvador Riding Rock Marina & Govt. Basin
    • B31A Ab- Grand Cays Harbour Plan
    • B31 Ab- Grand Cays to Double-Breasted Cays
    • B36 Ab- Moraine Cay
    • B158 Ab- Moraine Channel
    • B196 Ab- Bakers Bay Marina
    • BAH019 Bahamas Front
    • B191 Hog Cays to Moraine Cay
    • B127 Acklins -  Spring Pt & Central Acklins
     
    Today, 295 charts for Bahamas (from WLP) are published on the Marine GeoGarage

    Fukushima fish still contaminated from nuclear accident


    Fukushima Aftermath - Fish Contamination

    From BBC

    Levels of radioactive contamination in fish caught off the east coast of Japan remain raised, official data shows.
    It is a sign that the Dai-ichi power plant continues to be a source of pollution more than a year after the nuclear accident.

    About 40% of fish caught close to Fukushima itself are regarded as unfit for humans under Japanese regulations.
    The respected US marine chemist Ken Buesseler has reviewed the data in this week's Science journal.
    He says there are probably two sources of lingering contamination.
    "There is the on-going leakage into the ocean of polluted ground water from under Fukushima, and there is the contamination that's already in the sediments just offshore," he told BBC News.
    "It all points to this issue being long-term and one that will need monitoring for decades into the future."
    Prof Buesseler is affiliated to the US Woods Hole Oceanographic Institution (WHOI).
    His evaluation covers a year's worth of data gathered by the Japanese Ministry of Agriculture, Forestry and Fisheries (MAFF).

    The data is used to decide when fisheries should be opened or closed 18 months later

    Its monthly records detail the levels of radioactive caesium found in fish and other seafood products from shortly after the March 2011 Tohoku earthquake and tsunami - the double disaster that triggered the Fukushima crisis.
    The caesium-134 and 137 isotopes can be traced directly to releases from the crippled power station.
    MAFF uses the information to decide whether certain fisheries along five east-coast prefectures, including Fukushima, shoul

    The caesium does not normally stay in the tissues of saltwater fish for very long; a few percent per day on average should flow back into the ocean water.
    So, the fact that these animals continue to display elevated contamination strongly suggests the pollution source has not yet been completely shut off.
    He notes that although caesium levels in any fish type and on any day can be highly variable, it is the bottom-dwelling species off Fukushima that consistently show the highest caesium counts.

    For the WHOI researcher, this points to the seafloor being a major reservoir for the caesium pollution.
    "It looks to me like the bottom fish, the fish that are eating, you know, crabs and shellfish, the kinds of things that are particle feeders - they seem to be increasing their accumulation of the caesium isotopes because of their habitat on the seafloor," he explained.
    Prof Buesseler stresses however that the vast majority of fish caught off the northeast coast of Japan are fit for human consumption.

    The Japanese are among the world's highest per capita consumers of seafood

    And while the 40% figure for unsafe catch in the Fukushima prefecture may sound alarming, the bald number is slightly misleading.
    Last April, the Japanese authorities tried to instil greater market confidence by lowering the maximum permitted concentration of radioactivity in fish and fish products from 500 becquerels per kilogram of wet weight to 100 Bq/kg wet.
    This tightening of the threshold immediately re-classified fish previously deemed fit as unfit, even though their actual contamination count had not changed.
    It is also worth comparing the Japanese limit with international standards. In the US, for example, the threshold is set at 1,200 Bq/kg wet - significantly more lenient than even the pre-April Japanese requirement.

    And Prof Buesseler makes the point that some naturally occurring radionuclides, such as potassium-40, appear in fish at similar or even higher levels than the radioactive caesium.
    Nonetheless, the contamination question is a pertinent one in the Asian nation simply because its people consume far more fish per head than in most other countries.
    "At one level, there shouldn't be any surprises here but on another, people need to come to grips with the fact that for some species and for some areas this is going to be a long-term issue; and with these results it's hard to predict for how long some fisheries might have to be closed," said the WHOI scientist.

    Prof Buesseler, with Japanese colleagues, is organising a scientific symposium in Tokyo on 12/13 November to present the latest thinking on Fukushima and its impacts on the ocean.
    The information will then be shared with the public in a free colloquium on 14 November.d be opened or closed (it is not a measure of contamination in actual market fish).

    Links :
    • TheGuardian : Fukushima fish 'may be inedible for a decade'
    • NYTimes : Fish Off Japan’s Coast said to contain elevated levels of Cesium
    • WP : Cesium in fish off Fukushima suggests continued contamination from seabed or nuclear reactors
    • CNN : Radioactive levels staying high off Fukushima Daiichi in Japa
    • BBC (may 2012) : Bluefin tuna record Fukushima radioactivity 
    • WHOI : Fishing for Answers off Fukushima

    Thursday, October 25, 2012

    NOAA, National Archives team up with citizen-scientists to reconstruct historical climate of the Arctic


    A page from the log book of the US Navy steamer Bear, June 22, 1884.
    The Bear's logs are included in the Old Weather-Arctic citizen science project.
    (Credit: National Archives.)

    From NOAA

    Would you like to help NOAA climate scientists with an innovative new project that will help us better understand how the climate is changing?
    Do you love weather and history and have a computer and Internet connection?
    That’s all you need to join the Old Weather citizen science project

    Before there were satellites, weather data transmitters, or computer databases, there were the ship’s logs of Arctic sea voyages, where sailors dutifully recording weather observations.
    Now, a new crowdsourcing effort could soon make of the weather data from these ship logs, some more than 150 years old, available to climate scientists worldwide.

    NOAA, National Archives and Records Administration, Zooniverse — a citizen science web portal — and other partners are seeking volunteers to transcribe a newly digitized set of ship logs dating to 1850.
    The ship logs, preserved by NARA, are from U.S. Navy, Coast Guard and Revenue Cutter voyages in the Arctic between 1850 and the World War II era.

    “We hope to unlock millions of weather, sea ice and other environmental observations which are recorded in these documents,” said NOAA Administrator Jane Lubchenco, Ph.D.
    “These observations represent one of the largest and most underutilized collections of meteorological and marine environmental data in existence. Once converted into digital formats, new analyses of these data will help provide new insights.”

    Organizers hope to enlist thousands of volunteers to transcribe scanned copies of logbook pages via the Old Weather project with an eye to Information recorded in these logbooks will also appeal to a wide array of scientists from other fields – and professionals from other fields, including historians, genealogists, as well as current members and veterans of the U.S. Navy and Coast Guard.

    “We are delighted to be working with NOAA and Zooniverse so that our historical records can enable scientific discovery in the 21st century,” said David S. Ferriero, the Archivist of the United States. “While the data extracted from these records will be useful to scientists, these documents are also a treasure-trove of information for historians, genealogists, and others interested in the experiences and accomplishments of seafaring people.”

    The Old Weather collaboration will provide free online access to primary documents, new data resources, and analysis tools.
    Old Weather is one of a suite of projects produced, maintained and developed by the Citizen Science Alliance and accessible online through Zooniverse.
    Citizen Science Alliance member institutions work with academic and other partners around the world to produce projects that use the efforts and ability of volunteers to help scientists and researchers deal with the flood of data that confronts them, explained Philip Brohan, UK Met Office climate scientist and leader of the Old Weather project.

    The National Archives will host digital images from all the logbooks in this collaboration on its website.
    This three-way collaboration not only makes the logbooks available to Old Weather citizen scientists and NOAA researchers, but also to anyone with Internet access who wishes to explore the diplomatic, scientific, technological and military aspects of the voyages, as well as accounts of dramatic rescues and tragic losses. “The logbooks not only capture operations of U.S. government ships,” said Ferriero, “They are an important cornerstone to researching U.S. and global history of any type."

    The USS Jeannette's logs are part of the Old Weather-Arctic project.
    The ship was entrapped in Arctic sea ice for many months.
    Only a few sailors and the logbook survived this doomed 1879 Arctic expedition.
    (Credit: U.S. Navy public domain image)
    The Old Weather project began in 2010. Since then, 16,400 volunteers have transcribed 1.6 million weather observations from British Royal Navy logbooks – work that would have taken one person many years to complete.
    Now, Old Weather is taking on the National Archives’ extensive collection of logbooks, with an initial focus on ships that operated in the Arctic.
    Old Weather-Arctic will start off with roughly 100,000 logbook pages that include an estimated one million new-to-science observations.

    Participants in Old Weather-Arctic will be able to work with the logbooks of the doomed 1879 USS Jeannette Arctic expedition, the Revenue Cutter Thomas Corwin that carried the famous naturalist John Muir to the far North in 1881, and the Coast Guard cutter Bear that sailed the coasts of Alaska for nearly 50 years.
    Many other ships, whose logs will be added in coming months, engaged in a variety of both unusual and useful work-a-day tasks in the Arctic.

    For years, scientists at the NOAA Pacific Marine Environmental Laboratory (PMEL) in Seattle have been studying the Arctic climate and working to establish historical Arctic climate baseline data.
    However, much of the older data exist only in hand-written documents inaccessible to most scientists. Last year, researchers at PMEL and the Joint Institute for the Study of the Atmosphere and Ocean, a partnership between NOAA and the University of Washington, approached the National Archives about digitizing its unique collection ship logbooks.

    With funding from the North Pacific Research Board and the National Science Foundation, Old Weather-Arctic began taking shape.
    For several months, a small team of specially trained student interns worked with Archives’ staff to photograph the old ship logbooks, page-by-page, at a dedicated NOAA imaging station at National Archives facilities in Washington, D.C. and College Park, Md. Zooniverse has uploaded the ship log images to the Old Weather website, where volunteers can now transcribe the weather observations and any other interesting reports they might find.

    Project scientists will integrate the transcribed data produced by Old Weather volunteers into existing large-scale data sets, such as the International Comprehensive Ocean Atmosphere Data Set, which are used by researchers around the world.

    NOAA’s mission is to understand and predict changes in the Earth's environment, from the depths of the ocean to the surface of the sun, and to conserve and manage our coastal and marine resources.
    Visit us at www.noaa.gov and join us on Facebook, Twitter and our other social media channels.

    The National Archives and Records Administration is an independent federal agency that preserves and shares with the public records that trace the story of our nation, government, and the American people.
    From the Declaration of Independence to accounts of ordinary Americans, the holdings of the National Archives directly touch the lives of millions of people.
    The National Archives carries out its mission through a nationwide network of archives, records centers, and presidential Libraries, and online.

    Links :

    Wednesday, October 24, 2012

    A massive and illegal geoengineering project has been detected off Canada’s west coast


    A possible solution to the climate problem ? debate here

    From TheGuardian
    by Adam Corner who works in the School of Psychology at Cardiff University , for the Climate Outreach Information Network, and who is a member of the Integrated Assessment of Geoengineering Proposals research team

    Profitable climate fixes are too tempting for rogue geoengineers to resist
    It is the politics of climate change – not the science of geoengineering – that has created the opportunity for controversial iron dump

    It was only a matter of time before somebody broke the fragile social and political consensus surrounding geoengineering, and had a first crack at "experiment Earth".

    The news that American businessman Russ George has dumped 100 tonnes of iron sulphate into the Pacific Ocean in an attempt to fertilise algal blooms that absorb carbon dioxide, was received with justified indignation and outrage by campaigners and mainstream scientists.
    But there have been rumblings (and rumours of shadowy trials) for many years, and the idea of being a "geoengineer" was always going to prove tempting for the likes of George (who is blacklisted at several international ports for previous algae-related misdemeanours).

     Balance Rock, one of Haida Gwaii’s spiritual wonders left behind from the ice age,
    near the shores of ferry hotspot Skidegate on Oct. 3, 2012.
    (John Lehmann /The Globe and Mail)
    >>> geolocalization with the Marine GeoGarage <<<

    Geoengineering – the possibility of using large-scale technologies to counteract the effects of climate change – has arrived. The question is, are we ready for it?
    From a scientific perspective, the answer is "not yet".
    Very little is known about any of the technologies that we might one day use to seize control of the global thermostat.
    Some sound like science fiction and will probably remain that way.
    Even the more familiar ideas – like using biochar to capture CO2 – are unknown entities when
    operating on a global scale.

     Yellow and brown colours show relatively high concentrations of chlorophyll off the coast of Haida Gwaii, B.C., in August, 2012, after iron sulphate was dumped into the Pacific Ocean as part of a controversial geoengineering scheme. 
    Photograph by: Giovanni/Goddard Earth Sciences Data and Information Services Center/NASA

    But the big questions, for now, have less to do with science and more to do with politics, as the Canadian iron dump illustrates so well.
    The ingredients of a classic controversy are all there - a wealthy, gung-ho businessman; a misled and powerless local population; an allegedly complicit government and a blanket of secrecy over the whole affair.
    Research has shown that these are the kinds of issues that people are concerned about.
    And with individuals like Russ George around, who can blame them?

    The prospect of geoengineering raises fundamental questions about whether we are capable of actively, co-operatively and equitably managing the global commons.
    This is new territory: whereas the risks of a nuclear disaster are potentially global, the risks of geoengineering are inherently so.
    Are we ready to govern technologies that if ever deployed, would need to be maintained for decades – or perhaps even centuries – in order to keep temperatures down and the climate stable?
    The history of the past century suggests that we are in no position to manage technologies on this scale, or even keep rogue researchers in check.

    In fairness, there are some serious efforts underway to anticipate the governance challenges that geoengineering will raise, and to involve public and civil society voices in debates about how – or even if – geoengineering research should go ahead.
    But thanks to a characteristically weasel-worded UN text, there is precious little clarity about the level of geoengineering research permitted under international law, allowing George to describe two widely cited moratoria on ocean fertilisation as "a mythology".

    Campaign groups like ETC – that have persistently opposed geoengineering experiments of any kind – are dismissed as scaremongers by some in the scientific community. (see report)
    But rogue experiments like this vindicate their warnings – and may compromise the integrity of the whole field in the eyes of the public.

    The vast majority of scientists working on geoengineering are well aware of the ethical implications of their research, and are reluctant to suggest that they have sensible answers to climate change.
    But a handful are more enthusiastic, and outside of the scientific community, there are plenty of people itching to promote a climate "fix", because geoengineering offers a method of tackling climate change that doesn't require asking any difficult questions about unsustainable systems of production and consumption.

    In the US, rightwing pressure groups like the Heartland Institute have thrown their weight behind geoengineering as a "cost effective" solution to climate change, which is an incredibly telling insight into supposed climate scepticism.
    So often, a rejection of the science of climate change is just a proxy for a dislike of the policy implications.
    For those who object to the social engineering of behaviour change or regulation, geoengineering is a preferable option.

    It is the politics of climate change – not the science of geoengineering – that led to the iron dumping . Although artificial algal blooms are likely to have a range of unanticipated side-effects, it is not difficult to see how carbon captured through ocean fertilisation could easily be transformed into lucrative credits and fed into global carbon markets.
     
    And this possibility – profitable colonic irrigation for the planet – is simply too tempting for a rogue geoengineer to resist.

    Links :
    • Nature : Ocean-fertilization project off Canada sparks furore 
    • ScienceMag : Legal? Perhaps. But controversial fertilization experiment may produce little science
    • ScienceDirect : Ocean fertilization for geoengineering: A review of effectiveness, environmental impacts and emerging governance
    • DiscoveryNews : Geoengineering schemes spilt scientists