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As California awakens to the worsening risk of extreme climate events, researchers are shedding new light on last year’s anomalous and extreme Pacific Northwest heat wave. One study published this week said such heat waves could become 20 times more likely to occur if current carbon emissions continue unabated.

Another said they may also be nearly 10 degrees hotter.

The nine-day event in late June and early July 2021 seared parts of Northern California, Oregon, Washington and British Columbia, where Canada saw its highest temperature on record, 121.3 degrees. The heat wave claimed hundreds of lives, sparked several devastating wildfires and killed an estimated 1 billion sea creatures.

Such an event would have been “virtually impossible” in the 1950s, but atmospheric warming has already increased its probability to about a 0.5% chance per year, according to one study out of Columbia University, published Thursday in the journal Nature Climate Change. Should warming surpass 2 degrees Celsius — the upper limit set by the International Panel on Climate Change — that probability could soar to a 10% chance per year as soon as 2050.

“The single biggest control on how bad heat waves will get — in excess of how bad they already currently are — is the amount of CO2 that we put into the atmosphere,” said Samuel Bartusek, a Ph.D. student at Columbia’s Lamont-Doherty Earth Observatory and the lead author of the study. “There’s really only one solution to the problem of putting more carbon dioxide into the atmosphere, which is to stop doing it.”

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Bartusek said the extraordinary heat wave was “shocking” both for the people who experienced it and for the scientific community, which is why researchers hope to gain a better understanding of its physical mechanisms and its relationship to climate change.

“This was an extremely weird event,” said Michael Wehner, a climate scientist at the Lawrence Berkeley National Laboratory who co-authored another paper on the heat wave published last week in the journal Geophysical Research Letters. “It was also tragic, of course, because of the mortality that resulted from it.”

Among other conclusions, that paper found that the heat wave was so unprecedented it essentially broke most of the standard tools used to measure the human influence on heat waves.

“At the end of the day, we calculated not only was the event impossible without climate change — it was impossible with climate change. And of course, it happened, so that means that the model is wrong,” Wehner said.

Wehner said such statistical outliers make it difficult to forecast the future frequency of such events with certainty. However, his paper does include findings about temperature, noting that global warming caused as much as a 1.8 degree increase in maximum temperatures during the heat wave.

Future warming could lead to a roughly 9 degree increase in heatwave temperatures by the end of the 21st century, the paper says.

“The bottom line is that the amount of climate change we get is really determined by us, and by the people we elect to either mitigate emissions of carbon dioxide and other greenhouse gases or not,” he said. “And the less we do, the worse things get.”

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The Columbia researchers also found that several factors converged to help create the blistering heat dome, including anomalously dry soils and disruptions to the jet stream.

In California and other parts of the Western United States, increasing heat, drought and aridification are contributing to long-term drying of soils, which means there’s less water to be evaporated into the air, Bartusek explained.

“And if there is less ability for evaporation to come out of the ground, there is a greater heating effect — where the air that’s just above the surface will be heated more effectively,” he said. He added that in some areas it’s likely there was “this feedback process going on where the land surface helped amplify some of the highest temperatures.”

The jet stream — the fast-flowing air currents in the upper level of the atmosphere that guide weather systems from west to east — also played a role in the heat wave, according to the study. Before and during the event, the jet stream “buckled” into a wave pattern and slowed down, essentially locking the weather system in place and allowing the dome of heat to build up over the region.

The researchers noted that the effect of climate change on the jet stream is still being debated, although some scientists believe such wave patterns are becoming more frequent and extreme due to human activity. Wehner said the question is “one of the most interesting problems in climate science right now.”

“It definitely remains a possibility that we would see more of these kinds of unusual flows with global warming,” he said.


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Kai Kornhuber, an adjunct associate research scientist at the Lamont-Doherty Earth Observatory and another of the Columbia study’s authors, said the findings highlight how deviations among soil moisture levels, the jet stream and other factors can drive temperatures even beyond their usual magnitudes.

“Sometimes these factors just align and you get those conditions that cause a perfect storm,” he said. “What is important to mention here, though, is that each of those drivers do exhibit increasing trends that are associated with climate change ... These types of coincidences might just occur with a higher likelihood in the future, just because these common drivers are all linked to climate trends.”

As for how likely it is that such heat waves will reach that yearly 10% probability by 2050, much depends on which emissions pathway society ends up taking. But “given the accelerated trends in extreme weather events globally, there are reasons to believe that these estimates might even be a bit conservative,” Kornhuber said.

He and the other researchers noted that while some of the studies’ numbers and predictions may differ, their key messages are very similar — that the extreme heat wave was essentially impossible at pre-industrial emission levels.

“What is important in this aspect is these methods all agree that climate change plays a major role in every heat wave that we observe nowadays,” Kornhuber said.

Though the findings are dire, the researchers said they could help inform future modeling of such events and help people to better prepare. Many parts of the Pacific Northwest were unequipped for such extreme heat, including homes without air conditioning and infrastructure systems unable to handle such strain. Wehner said improved adaptation efforts and contingency plans will help, but that ultimately, such events “are going to get worse because there’s a lot of climate change that’s baked into the system.”

“The more we can reduce our emissions — eventually getting down to none, to zero — and the sooner we can do that, the better in terms of avoiding even worse tragedies,” he said.

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Ohio House Joint Resolution Amended to Include Increasing Threshold to Legislative Ballot Initiatives

The Committee of Government Oversight amended a resolution Thursday to require all proposed ballot issues to receive 60 percent of the vote in order to amend the state constitution, not just citizen-led amendments.

State Representative Brian Stewart (R-Ashville) requested the committee to adopt an amendment to his resolution, House Joint Resolution (HJR) 6, to include legislative ballot initiatives to also require 60 percent of the vote on Election Day in order to be enacted.

“I think if we’re gonna go to the ballot it’s just frankly a simpler argument to say 60 percent across the board and so that was actually a change I requested and I appreciate the chairman for getting it added promptly today,” Stewart said.

The original proposal only changed the threshold for citizen initiatives. Stewart said he started with just citizen-led initiatives because legislative-led initiatives must receive a three-fifths majority in the House and Senate for lawmakers to place them on the ballot.

Republican Ohio Secretary of State Frank LaRose is a vocal supporter of the resolution. According to LaRose, lawmakers design state constitutions to serve as a “statement of basic principles and highest laws of a state.” Instead, because of the ease of amending Ohio’s founding document, the Ohio Constitution has become a tool used by special interests to change our form of government to their liking permanently.

“If a special interest group can’t afford to pay, you know, million dollars to hire people with clipboards. They can afford to pay a million and a half dollars to hire more people with more clipboards,” LaRose said.

Opponents say this resolution is politically motivated to block future controversial citizen-led ballot issues.

Common Cause Ohio, among a group of 140 voter rights and left-leaning organizations, has sent a letter to LaRose, House Speaker Bob Cupp (R-Lima), and Senate President Matt Huffman (R-Lima) asking them to halt their efforts to pass the resolution.

“This is not a good-government reform. Making the ballot initiative process even harder for citizen groups will have the opposite of the desired effect. It will make it almost impossible for anyone except big money special interests to successfully pass a ballot initiative in Ohio,” the letter reads.

According to the National Conference of State Legislatures, Ohio is one of 18 states where citizens can attempt to amend the state constitution through an “initiated amendment,” though Mississippi’s supreme court has invalidated its law. The Virgin Islands also allow for an initiated constitutional amendment.

“We aren’t trying to make amending the constitution impossible we are simply trying to require that you in a diverse state of 11 plus million people that you get more than 50 percent of the 25 percent that might show up to vote,” Stewart said.

The resolution would have to pass the State House and State Senate with a three-fifths majority by the end of the year to put it on the May 2023 ballot.

– – –

Hannah Poling is a lead reporter at The Ohio Star and The Star News Network. Follow Hannah on Twitter @HannahPoling1. Email tips to [email protected]
Photo “Brian Stewart” by The Ohio House of Representatives. Background Photo “Election Day 2022” by Phil Roeder. CC BY 2.0.




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