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Date TimeJuly 03, 2019
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Baked Alaska: record heat fuels wildfires and sparks personal fireworks ban
Anchorage sees 80F weather with nearly 120 fires blazing across the statePeople cooling off in Wasilla Lake in Wasilla, Alaska, last month. Photograph: Mark Thiessen/APRecord-breaking heat across Alaska is pushing tourists to beaches, and sending flames across the unseasonably hot, dry state.Anchorage experienced higher than average temperatures nearly every day of June, reaching a balmy 80F on days that once maxed out at a mild 67.The weather is forecasted to heat up further through and after the Fourth of July, with temperatures expected to climb to nearly 90F in Fairbanks and Anchorage over the weekend.If the forecasts are correct, the state could set several new local heat records before the week is out.Alaska’s heating has a cascading effect. As ocean temperatures rise, the coasts heat up, with potentially catastrophic consequences on land and in the water. And all that local heat contributes to faster planet-wide warming.The Rainbow 2 fire, burning near Delta Creek, Alaska, late last month. Photograph: Handout/ReutersAlaska is no stranger to large wildfires, and so far this year’s fire season is only slightly worse than average. But with about a quarter-million acres burned in roughly the last week, nearly 120 fires still uncontained, and the heat still rising, authorities aren’t taking any chances.With resources spread thin and fearing further sparks, the state fire marshal’s office issued a statewide ban on the sale and personal use of fireworks ahead of the holiday.Greenhouse gas emissions from burning fossil fuels, forest destruction and other human activities are trapping heat and putting more energy into the climate system. Hotter air means heatwaves are much more likely. For example, scientists now say the unprecedented heat and wildfires across the northern hemisphere in 2018 “could not have occurred without human-induced climate change”. In Australia, the scorching summer of 2016-17 in New South Wales was made at least 50 times more likely by global heating, linking it directly to climate change.Hotter air can also carry more water vapour, meaning more intense rain and more flooding. Another important factor in the northern hemisphere is the impact of changes in the Arctic. The polar region is heating more rapidly, reducing the temperature difference with lower latitudes. There is strong evidence that this is weakening the planetary waves (including the jet stream) that normally meander over Europe, Asia and North America.When these waves stall, weather gets fixed over regions and becomes extreme. This has been linked to past floods in Pakistan, heatwaves in Russia and drought in California. Most of the planet’s trapped heat goes into the oceans and rising sea temperatures mean more energy for hurricanes and typhoons. Record-breaking cyclones hit Mozambique in March and April. The deluge delivered in the US by Hurricane Harvey in 2017 was made three times more likely by climate change. Rising sea level also means storms cause more coastal damage.Global heating does not influence all extreme weather – natural variability still exists. Carbon Brief analysed more than 230 studies and found 95% of heatwaves were made more likely or worse by climate change. For droughts, 65% were definitely affected by our hotter world, while the figure for floods was 57%. It is now undeniable that global heating is causing more extreme weather.Alaska is trapped in a kind of hot feedback loop, as the arctic is heating up much faster than the rest of the planet. Ocean surface temperatures upwards of 10F hotter than average have helped to warm up the state’s coasts. When Bering and Chukchi sea ice collapsed and melted months earlier than normal this spring, the University of Alaska climate specialist Rick Thoman characterized the water as “baking”.“I intentionally try to not be hyperbolic, but what do you say when there’s 10- to 20- degree ocean water temperature above normal?” Thoman told the Guardian. “How else do you describe that besides extraordinary?”> The northern Bering & southern Chukchi Seas are baking. Large areas away from land with ocean surface temperatures more than 5C (9F) above the 1981-2010 average. Impacts to the climate system, food web, communities and commerce. akwx ClimateCrisis @Climatologist49 @amy_holman pic.twitter.com/HkrHpZGs8g> > — Rick Thoman (@AlaskaWx) June 24, 2019The hot water has affected sea birds and marine life, with mass mortality events becoming commonplace in the region. The National Park Service characterizes Alaska’s increasingly frequent sea bird die-offs, called “wrecks”, as “extreme”. “The folks in the communities are saying these animals look like they’ve starved to death,” said Thoman.Accelerating ice melt stands to put the state’s coastal communities at risk, reshaping food sources the people rely on and the very land on which they live. Where there are no built roads, Alaskans rely on frozen ground as infrastructure for traveling. Less ice means less of the life that’s evolved to depend on that ice, both animal and human.A general view of the mountain valley obscured by smoke taken from the Glen Alps trailhead of Chugach state park in Anchorage, Alaska, on 29 June. Photograph: Yereth Rosen/Reuters“It’s really affecting people’s ability to provide for themselves and their families,” said Brendan Kelly, a University of Alaska marine biology professor and executive director of Study of Environmental Arctic Change. “The amount of time people have to fish, to hunt, to trap is shrinking from both ends.”Dozens of towns in Alaska are now or will soon be in need of relocation from eroding land and rising oceans.“Things are changing so rapidly in Alaska right now we just can’t keep up,” said Thoman.




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