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Sharp jet stream waves move across North America in this NASA simulation. Image: NASA
Last summer's extreme weather was a showcase of how global warming is altering our atmosphere, from a scorching heat wave that contributed to a spate of wildfires in Scandinavia and California to devastating floods and all-time record-high temperatures set around the Northern Hemisphere.
What's new: A new study, published last week in the journal Science Advances, ties these events and other summertime extremes to human-caused climate change via an increase in a specific jet stream phenomenon, lead author Michael Mann of Penn State tells Axios.
Details: Daniel Swain, a climate scientist at UCLA who was not involved in the new research, explains the phenomenon — known as quasi-resonant amplification, or QRA — this way: "Quasi-resonant amplification refers to a condition where high-altitude winds across the Northern Hemisphere enter a spatial configuration favorable for the development and persistence of big loops in the jet stream," he says.
What they did: The authors devised an indirect method of detecting changes in QRA events by examining the differences in temperature across the Northern Hemisphere and how it changes from north to south worldwide.
What they found: An uptick in such QRA events can, in part, be tied to rapid Arctic climate change.
The new study also found an unexpected result: Cutting aerosol pollution (tiny particles in the air from burning coal, for example) may prevent the jet stream from getting hung up as frequently in the future.
What they're saying: Jennifer Francis, a scientist at Woods Hole Research Center who was not involved in the new research, told Axios the study adds valuable new information.
"I think they're onto an important mechanism that helps explain the influences of a rapidly warming Arctic on summer weather extremes over midlatitude continents. ... The underlying drumbeat in both seasons is about persistent patterns and conditions that can turn into extreme events; in summer, this means heatwaves, floods and drought."— Jennifer Francis, Woods Hole Research Center
One of the individuals encountered during excavation at Jiskairumoko, a pre-Columbian archaeological site southeast of Puno, Peru. The human remains have been removed in this image. From the Science Advances study. Photo: Mark Aldenderfer
In the largest examination to date of genetic material from ancient Americans, researchers found some genetic similarity among remains in Montana, Nevada and Brazil — showing there was likely a rapid migration of people from the tip of North America, Eileen Drage O'Reilly reports.
Why it matters: Researchers want to better understand how people first migrated, dispersed and settled into the different areas of the Americas. These genetic samplings — including some more than 10,000 years old — bolster theories of what may have happened, but also bring forth new questions, particularly about new lineages that were discovered.
1. A study in Science analyzed 15 diverse bone samples — 6 of which are more than 10,000 years old — from sites across North and South America.
"So that raises the really interesting question: Was no one else home? Yet we suspect archaeologically there was and we’re actually getting some hints in the genetic record that there were other populations present as well."— David Meltzer, Southern Methodist University
2. Another study, in Cell Press, examines 49 individuals spanning about 10,000 years in Belize, Brazil, the Central Andes and southern South America.
At least 7 new members of Congress elected Tuesday have STEM backgrounds — an unusually large number that comes in part due to a concerted effort to recruit candidates with science backgrounds.
Why it matters: Having a larger crop of members who understand complex scientific topics, from climate change to nuclear engineering, could result in legislation that better incorporates scientific information.
The big picture: Scientists were mobilized by how swiftly and broadly the Trump administration moved to roll back regulations on climate change, land use and other issues.
The winners: The list of new STEM members (all Democrats):
These new members will join two Democratic incumbents: Rep. Bill Foster of Illinois, a physicist, and Rep. Jerry McNerney of California, who has a Ph.D. in mathematics.
There will be one new senator with a STEM background, too: Jacky Rosen, who defeated incumbent Republican Sen. Dean Heller in Nevada. Prior to serving in the House, she was a computer programmer and software developer.
The bottom line: "We need scientists in Congress to represent the scientific perspective whenever an issue is being discussed," Rush Holt, CEO of the American Association for the Advancement of Science — and himself a physicist and former congressman from New Jersey — tells Axios. Their specific expertise, he says, is less important than the fact that "they will have a professional background in evidence-based thinking."
Photo of a SpaceX launch and landing from Vandenberg AFB in California on Oct. 8. Image: SpaceX/Flickr
It's not aliens! Despite speculation ignited by a pre-print study, it's highly unlikely that the interstellar object known as Oumuamua is an alien light sail or a spaceship.
SpaceX: The commercial space company led by Elon Musk has launched a $750 million leveraged loan led by Bank of America Merrill Lynch. The move could result in some of the company's financials becoming public, writes Dan Primack.
Nuclear power: The Union of Concerned Scientists, a high-profile environmental group, is joining other organizations in calling for U.S. nuclear power plants to stay open due to their low greenhouse gas emissions, Amy Harder writes.
Fact-checking Trump: In an Axios interview, President Donald Trump disavowed a seminal climate science report issued by his own government's scientists and said climate varies naturally. Amy Harder and I fact-checked his claims.
A whale shark seen near Isla Mujeres, Mexico. Credit: Ken Kiefer/Barcroft India/Barcroft Media via Getty Images.
The Placebo Effect: In a NYT Magazine feature, Gary Greenberg details efforts to figure out why the so-called placebo effect seems to work so well in certain people with particular conditions. New findings may challenge conventional wisdom, with implications for drug development and approval, he writes.
Pyramids of Giza discovery: Researchers uncovered a ramp with postholes that may have been used to transport stones at 20-degree inclines in order to build the pyramids, helping to explain one of the great mysteries of these ancient structures, Kevin Rawlinson writes in The Guardian.
Whale shark ultrasound: Watch as fisheries scientist Rui Matsumoto performs an ultrasound on an adult female whale shark near the Galapagos Islands. Scientists know precious little about how these massive sharks reproduce, writes Jason Bittel for the Washington Post.
Animation of the South Pole's stratospheric ozone hole during fall of 2018. Image: NASA.
Historically, a story on the ozone hole would be a bummer.
Well, not this time. It's taken decades, but a UN report released this week shows that the Montreal Protocol on Substances that Deplete the Ozone Layer, a global treaty that went into force in 1987, is finally paying off in the form of a healing stratospheric ozone layer.
Why it matters: The ozone "hole" over Antarctica was one of the most shocking and disturbing scientific findings in global environmental history when it was made more than two decades ago.
Details: Unlike what is happening with climate change, science translated almost directly into action on the ozone. Countries moved to ban the use of chlorofluorocarbons, or CFCs, which break down ozone in the upper atmosphere. Because of CFC's long atmospheric lifetime, we're only now seeing the dividends.
The bottom line: It's fortunate that scientists discovered the ozone hole when they did and that action was taken swiftly. Otherwise, we could've been dealing with far more severe ozone depletion throughout this century and into the next.
Thanks for reading! Have a great week, and see you again next Thursday.