Värmeböljor blir vanligare i Arktis, som värms i snabbare takt än jorden i övrigt. Västra Sibirien har varit rekordvarmt i vår och nu säger prognosen att temperaturen i Arktis kommer att ligga över medel åtminstone till augusti.
100 degrees in Siberia? 5 ways the extreme Arctic heat wave follows a disturbing pattern
The Arctic heat wave that sent Siberian temperatures soaring to around 100 degrees Fahrenheit on the first day of summer put an exclamation point on an astonishing transformation of the Arctic environment that’s been underway for about 30 years.
As long ago as the 1890s, scientists predicted that increasing levels of carbon dioxide in the atmosphere would lead to a warming planet, particularly in the Arctic, where the loss of reflective snow and sea ice would further warm the region. Climate models have consistently pointed to “Arctic amplification” emerging as greenhouse gas concentrations increase.
Well, Arctic amplification is now here in a big way. The Arctic is warming at roughly twice the rate of the globe as a whole. When extreme heat waves like this one strike, it stands out to everyone. Scientists are generally reluctant to say “We told you so,” but the record shows that we did.
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Arctic heat waves are happening more often
Arctic heat waves now arrive on top of an already warmer planet, so they’re more frequent than they used to be.
Western Siberia recorded its hottest spring on record this year, according the EU’s Copernicus Earth Observation Program, and that unusual heat isn’t expected to end soon. The Arctic Climate Forum has forecast above-average temperatures across the majority of the Arctic through at least August.
https://theconversation.com/100-degrees-in-siberia-5-ways-the-extreme-arctic-heat-wave-follows-a-disturbing-pattern-141442
Mer om värmen i Arktis, som orsakar mer skogsbränder och att permafrosten tinar och avger metan som sprids över världen.
Arctic Swelters Under 38 °C Heat Wave
The possibly record-breaking temps follow the warmest winter on record in the region.
The Arctic is warming more than twice as fast as the rest of the globe, and National Geographic reports that winter average temperatures have already exceeded the 2 °C threshold set by the Paris climate agreement to limit catastrophic consequences. While the World Meteorological Organization is still working to verify Verkhoyansk’s record, scientists say it points to a troubling trend.
“The key point is that the climate is changing and global temperatures are warming,” Freja Vamborg, a senior scientist at the Copernicus Climate Change Service in the UK, tells the Associated Press. “We will be breaking more and more records as we go.” Antarctica also registered record-breaking temperatures this year.
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“Methane escaping from permafrost . . . enters the atmosphere and circulates around the globe,” Katey Walter Anthony, a University of Alaska Fairbanks expert on methane release, tells the AP. “Methane that originates in the Arctic does not stay in the Arctic. It has global ramifications.”
https://www.the-scientist.com/news-opinion/arctic-swelters-under-38-heat-wave-67664
Här är fler kommentarer från forskare:
The Arctic is on fire: Siberian heat wave alarms scientists
MOSCOW (AP) — The Arctic is feverish and on fire — at least parts of it are. And that’s got scientists worried about what it means for the rest of the world.
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“The Arctic is figuratively and literally on fire — it’s warming much faster than we thought it would in response to rising levels of carbon dioxide and other greenhouse gases in the atmosphere, and this warming is leading to a rapid meltdown and increase in wildfires,” University of Michigan environmental school dean Jonathan Overpeck, a climate scientist, said in an email.
https://apnews.com/39c5b62946a0951cf0d98e4f952f47fd