SOURCE: The Guardian
DATE: January 19, 2019
SNIP: Glaciers in western North America, excluding Alaska, are melting four times faster than in the previous decade, with changes in the jet stream exacerbating the longer-term effects of climate change, according to a new study.
The jet stream – the currents of fast-flowing air in the atmosphere that affect weather – has shifted, causing more snow in the north-western US and less in south-western Canada, according to the study released in Geophysical Research Letters, a publication of the American Geophysical Union. Changes in the northern hemisphere jet stream are increasingly firmly linked to global warming.
That warming from humans burning fossil fuels is also expected to continue to melt alpine glaciers, even under scenarios for more moderate greenhouse gas levels.
While some of the fourfold increase in the melting rate in western North America is related to manmade climate change, the researchers can’t say with certainty how much.