(REPOST: The Guardian)
The annual report released on Tuesday by the National Oceanic and Atmospheric Administration showed slightly less warming in many measurements than a record hot 2016. But scientists remain concerned because the far northern region is warming twice as fast as the rest of the globe and has reached a level of warming that’s unprecedented in modern times.
“2017 continued to show us we are on this deepening trend where the Arctic is a very different place than it was even a decade ago,” said Jeremy Mathis, head of NOAA’s Arctic research program and co-author of the 93-page report.
Findings were discussed at the American Geophysical Union meeting in New Orleans.
“What happens in the Arctic doesn’t stay in the Arctic; it affects the rest of the planet,” said acting NOAA chief Timothy Gallaudet. “The Arctic has huge influence on the world at large.”
Permafrost records show the frozen ground that many buildings, roads and pipelines are built on reached record warm temperatures last year nearing and sometimes exceeding the thawing point. That could make them vulnerable when the ground melts and shifts, the report said. Unlike other readings, permafrost data tend to lag a year.
Preliminary reports from the US and Canada in 2017 showed permafrost temperatures are “again the warmest for all sites” measured in North America, said study co-author Vladimir Romanovsky, a professor at the University of Alaska in Fairbanks.