Arctic Resists Warming

RESEARCHERS: New patterns of cooling ocean currents, winds suggest region is struggling to keep its balance.

By ROBERT LEE HOTZ
Los Angeles Times

An international team of scientists reported Thursday that rising temperatures are steadily transforming the Arctic -- warming millions of square miles of permafrost, promoting lush greenery on previously arid tundras and steadily shrinking the annual sea ice.

Yet the researchers also found new patterns of cooling ocean currents and prevailing winds that suggested the Arctic, long considered a bellwether of global warming, may be reverting in some ways to more normal conditions not seen since the 1970s.

Taken together, these findings may be evidence, the researchers said, of the region struggling to keep its balance, as rising temperatures slowly overturn the long-established order of seasonal variations.

"This is a region that is fighting back," said lead author Jacqueline Richter-Menge, a civil engineer at the Cold Regions Research and Engineering Laboratory in Hanover, N.H. "There are things that showed signs of going back to norms, trying to right themselves under very dire circumstances."