*NEWS*WARM CLIMATE TRANSFORMS ALASKA

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*NEWS*WARM CLIMATE TRANSFORMS ALASKA

 user 2005-09-30 at 10:41:00 am Views: 46
  • #13210

    Warm climate transforms Alaska terrain

    ANCHORAGE, Alaska –
    Sinking villages perched on thawing permafrost, an explosion of
    timber-chewing insect populations, record wildfires and shrinking sea
    ice are among the most obvious and jarring signs that Alaska is getting
    warmer as the global climate changes, scientists say.
    “We are the canary in the mine, unfortunately, and the harbinger of
    what is yet to come for the rest of the world,” said Patricia Cochran,
    executive director of the Anchorage-based Alaska Native Science
    Commission.
    Atmospheric temperatures in the remote state have risen 3.6 to 5.4
    degrees Fahrenheit (2 to 3 degrees Celsius) over the past five decades,
    according to the recently released Arctic Climate Impact Assessment, a
    comprehensive study by scientists from eight nations.
    That heating, most pronounced in winter and spring, is much more
    dramatic than in the rest of the world, which has had an average
    increase in land surface temperatures of 1 degree Fahrenheit (0.6
    Celsius) over the last century, according to the Environmental
    Protection Agency.
    Many scientists believe the earth is warming because of the release of
    greenhouse gases such as carbon dioxide that trap solar heat in the
    atmosphere.
    A massive beetle infestation has swept through millions of acres in
    south-central Alaska over the past decade, scientists said, because
    significantly warmer weather is delaying the usual winter die-off of
    insect populations.
    The insects’ voracious attack on spruce bark has left forests
    tinder-dry while general heat-induced stress have weakened forests,
    with lightning strikes making them a fire hazard in the Chugach
    Mountain foothills, said Glenn Juday, a professor of forest ecology at
    the University of Alaska Fairbanks.
    “All the trees in the boreal forest are showing unusual symptoms of
    warmth-related health problems,” Juday said, noting that Alaska had its
    biggest and third-biggest fire seasons in the past two summers.
    “The warmer it gets the more we burn,” Juday said.
    Sinking towns
    In The cooler interior regions, buildings are slumping and roads are
    buckling as permafrost — frozen soil — thaws and turns into softer,
    spongy soil. The Inupiat village of Shishmaref on a narrow Chukchi Sea
    barrier island is preparing to move as the town sinks into the ground.
    “For those of us who live in the changing conditions every day, there’s
    no question. We see it. We feel it every single day,” Cochran said.
    Satellite records released on Wednesday showed that sea ice coverage in
    the arctic region has fallen for the last four years with “unusually
    early springtime melting in areas north of Siberia and Alaska,”
    according to a study by the University of Colorado, NASA and the
    University of Washington.
    Shrinking sea ice has created hardships for sea animals like polar bears that find their prey at the ice’s edge.
    Heated-up waterways are throwing off long-established salmon cycles
    and, according to one scientist, have allowed a warmth-loving,
    salmon-wrecking parasite to thrive in the Yukon River.
    Warming is accentuated in high-latitude regions like Alaska in part
    because of thinner atmospheres in the polar region, concentrating
    greenhouse gases, and in part because of the nature of atmospheric
    currents, according to studies.
    Such changes have also contributed to falling ice coverage in the
    Arctic Sea, with spring and summer melting happening 17 days earlier
    than usual, according to the satellite study.
    The disappearance of ice and snow uncovers dark surfaces of the ground
    and sea, which absorb more solar heat and warm up the landscape, said
    Vladimir Romanovsky, a permafrost expert at the University of Alaska
    Fairbanks’ Geophysical Institute.