NNWCI W NEWS AND NOTES MOS T OF ARCTIC'S NEAR- a soil model that depicts freezing 10,00 0 years ago, and will be SURFACE PERMAFROST MAY and thawing. Results appear on- largely unaffected by global warm- THA W BY 210 0 line in the 17 December issue of ing in the coming century, says Accordin g to a new National Geophysical Research Letters. Lawrence. Center for Atmospheric Research "People have used models to Recent warming has degraded (NCAR) model, global warming study permafrost before, but not large sections of permafrost across may thaw the top 10 or more feet within a fully interactive climate central Alaska, with pockets of of perennially frozen soil in the system model," says lead author soil collapsing as the ice within it Northern Hemisphere, altering David Lawrence of NCAR. melts. The results include buckled ecosystems across Canada, Alaska, About a quarter of the North- highways, destabilized houses, and and Russia. The new simulations ern Hemisphere's land contains "drunken forests"—trees that lean show that more than half of the permafrost, defined as soil that at wild angles. area covered by this topmost layer remains below 32°F for at least Th e CCSM simulations are of
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Mar 1, 2006
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