Old Ice vs New Ice - 1988, 199, 2001, 2005
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This AP article summarizes the basic conclusions, adding to the drum beat that we are heating things up:
"Signs of warming continue in the Arctic with a decline in sea ice, an increase in shrubs growing on the tundra and rising worries about the Greenland ice sheet.But there is some interesting cross-currents in the data, from the LA Times article by Robert Lee Hotz:
"There have been regional warming periods before. Now we're seeing Arctic-wide changes," James Overland, an oceanographer at the Pacific Marine Environmental Laboratory in Washington state, said Thursday.
For each of the last five years it was at least 1 degree Celsius (1.8 F) above average over the entire Arctic over the entire year, he said.
The new "State of the Arctic" analysis, released by the U.S. government's National Oceanic and Atmospheric Administration, also reports an increase in northward movement of warmer water through the Bering Strait in 2001-2004, which might be a factor in continuing reduction of 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.The dude's name is Hotz.
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.' "