I have been a follower of Ugly Hedgehog for some years.
Last Sunday ‘Alphadog’ posted this photograph taken on Route 66, the Antares Road, in Kingman, Arizona. It is reproduced here with Richard’s full permission.
There is no question the world’s weather systems are changing. However, for folk who are not trained in this science it is all a bit mysterious. So thank goodness that The Conversation have not only got a scientist who does know what he is talking about but also they are very happy for it to be republished.
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Atmospheric rivers are shifting poleward, reshaping global weather patterns
Atmospheric rivers are long filaments of moisture that curve poleward. Several are visible in this satellite image. Bin Guan, NASA/JPL-Caltech and UCLA
Atmospheric rivers – those long, narrow bands of water vapor in the sky that bring heavy rain and storms to the U.S. West Coast and many other regions – are shifting toward higher latitudes, and that’s changing weather patterns around the world.
The shift is worsening droughts in some regions, intensifying flooding in others, and putting water resources that many communities rely on at risk. When atmospheric rivers reach far northward into the Arctic, they can also melt sea ice, affecting the global climate.
In a new study published in Science Advances, University of California, Santa Barbara, climate scientist Qinghua Dingand I show that atmospheric rivers have shifted about 6 to 10 degrees toward the two poles over the past four decades.
California relies on atmospheric rivers for up to 50% of its yearly rainfall. A series of winter atmospheric rivers there can bring enough rain and snow to end a drought, as parts of the region saw in 2023.
Atmospheric rivers occur all over the world, as this animation of global satellite data from February 2017 shows. NASA/Goddard Space Flight Center Scientific Visualization Studio
While atmospheric rivers share a similar origin – moisture supply from the tropics – atmospheric instability of the jet stream allows them to curve poleward in different ways. No two atmospheric rivers are exactly alike.
What particularly interests climate scientists, including us, is the collective behavior of atmospheric rivers. Atmospheric rivers are commonly seen in the extratropics, a region between the latitudes of 30 and 50 degrees in both hemispheres that includes most of the continental U.S., southern Australia and Chile.
Our study shows that atmospheric rivers have been shifting poleward over the past four decades. In both hemispheres, activity has increased along 50 degrees north and 50 degrees south, while it has decreased along 30 degrees north and 30 degrees south since 1979. In North America, that means more atmospheric rivers drenching British Columbia and Alaska.
The poleward movement of atmospheric rivers can be explained as a chain of interconnected processes.
During La Niña conditions, when sea surface temperatures cool in the eastern tropical Pacific, the Walker circulation – giant loops of air that affect precipitation as they rise and fall over different parts of the tropics – strengthens over the western Pacific. This stronger circulation causes the tropical rainfall belt to expand. The expanded tropical rainfall, combined with changes in atmospheric eddy patterns, results in high-pressure anomalies and wind patterns that steer atmospheric rivers farther poleward.
La Niña, with cooler water in the eastern Pacific, fades, and El Niño, with warmer water, starts to form in the tropical Pacific Ocean in 2023. NOAA Climate.gov
Conversely, during El Niño conditions, with warmer sea surface temperatures, the mechanism operates in the opposite direction, shifting atmospheric rivers so they don’t travel as far from the equator.
The shifts raise important questions about how climate models predict future changes in atmospheric rivers. Current models might underestimate natural variability, such as changes in the tropical Pacific, which can significantly affect atmospheric rivers. Understanding this connection can help forecasters make better predictions about future rainfall patterns and water availability.
Why does this poleward shift matter?
A shift in atmospheric rivers can have big effects on local climates.
In the subtropics, where atmospheric rivers are becoming less common, the result could be longer droughts and less water. Many areas, such as California and southern Brazil, depend on atmospheric rivers for rainfall to fill reservoirs and support farming. Without this moisture, these areas could face more water shortages, putting stress on communities, farms and ecosystems.
In higher latitudes, atmospheric rivers moving poleward could lead to more extreme rainfall, flooding and landslides in places such as the U.S. Pacific Northwest, Europe, and even in polar regions.
A satellite image on Feb. 20, 2017, shows an atmospheric river stretching from Hawaii to California, where it brought drenching rain. NASA/Earth Observatory/Jesse Allen
In the Arctic, more atmospheric rivers could speed up sea ice melting, adding to global warming and affecting animals that rely on the ice. An earlier study I was involved in found that the trend in summertime atmospheric river activity may contribute 36% of the increasing trend in summer moisture over the entire Arctic since 1979.
What it means for the future
So far, the shifts we have seen still mainly reflect changes due to natural processes, but human-induced global warming also plays a role. Global warming is expected to increase the overall frequency and intensity of atmospheric rivers because a warmer atmosphere can hold more moisture.
How that might change as the planet continues to warm is less clear. Predicting future changes remains uncertain due largely to the difficulty in predicting thenatural swings between El Niño and La Niña, which play an important role in atmospheric river shifts.
As the world gets warmer, atmospheric rivers – and the critical rains they bring – will keep changing course. We need to understand and adapt to these changes so communities can keep thriving in a changing climate.
Those last two paragraphs of the above article show the difficulty in coming up with clear predictions of the future. As was said: ‘How that might change as the planet continues to warm is less clear. Predicting future changes remains uncertain due largely to the difficulty in predicting thenatural swings between El Niño and La Niña, which play an important role in atmospheric river shifts.‘
My son, Alex, took the following photographs of the Aurora..
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They are fabulous. Especially so because as it happened we had mainly cloud cover here in Southern Oregon.
To close, here is an extract from yesterday’s BBC website:
On Thursday night, the stunning colours of the Northern Lights were visible once again even to the naked eye across much of the US.
Experts say the Northern Lights, or Aurora Borealis, are more visible right now due to the sun being at what astronomers call the “maximum” of its 11-year solar cycle.
What this means is that roughly every 11 years, at the peak of this cycle, the sun’s magnetic poles flip, and the sun transitions from sluggish to active and stormy. On Earth, that’d be like if the North and South Poles swapped places every decade.
“At its quietest, the sun is at solar minimum; during solar maximum, the sun blazes with bright flares and solar eruptions,” according to Nasa, the US space agency.
The current 11-year cycle, the 25th since records began in 1755, started in 2019 and is expected to peak next year.
Some of the best evidence for this comes from the behavior of two of the most powerful beings of the Maya world: The first is a creator god whose name is still spoken by millions of people every fall – Huracán, or “Hurricane.” The second is a god of lightning, K’awiil, from the early first millennium C.E.
As a scholar of the Indigenous religions of the Americas, I recognize that these beings, though separated by over 1,000 years, are related and can teach us something about our relationship to the natural world.
Huracán, the ‘Heart of Sky’
Huracán was once a god of the K’iche’, one of the Maya peoples who today live in the southern highlands of Guatemala. He was one of the main characters of the Popol Vuh, a religious text from the 16th century. His name probably originated in the Caribbean, where other cultures used it to describe the destructive power of storms.
The K’iche’ associated Huracán, which means “one leg” in the K’iche’ language, with weather. He was also their primary god of creation and was responsible for all life on earth, including humans.
Because of this, he was sometimes known as U K’ux K’aj, or “Heart of Sky.” In the K’iche’ language, k’ux was not only the heart but also the spark of life, the source of all thought and imagination.
Yet, Huracán was not perfect. He made mistakes and occasionally destroyed his creations. He was also a jealous god who damaged humans so they would not be his equal. In one such episode, he is believed to have clouded their vision, thus preventing them from being able to see the universe as he saw it.
Huracán was one being who existed as three distinct persons: Thunderbolt Huracán, Youngest Thunderbolt and Sudden Thunderbolt. Each of them embodied different types of lightning, ranging from enormous bolts to small or sudden flashes of light.
Despite the fact that he was a god of lightning, there were no strict boundaries between his powers and the powers of other gods. Any of them might wield lightning, or create humanity, or destroy the Earth.
Another storm god
The Popol Vuh implies that gods could mix and match their powers at will, but other religious texts are more explicit. One thousand years before the Popol Vuh was written, there was a different version of Huracán called K’awiil. During the first millennium, people from southern Mexico to western Honduras venerated him as a god of agriculture, lightning and royalty.
Illustrations of K’awiil can be found everywhere on Maya pottery and sculpture. He is almost human in many depictions: He has two arms, two legs and a head. But his forehead is the spark of life – and so it usually has something that produces sparks sticking out of it, such as a flint ax or a flaming torch. And one of his legs does not end in a foot. In its place is a snake with an open mouth, from which another being often emerges.
Indeed, rulers, and even gods, once performed ceremonies to K’awiil in order to try and summon other supernatural beings. As personified lightning, he was believed to create portals to other worlds, through which ancestors and gods might travel.
Representation of power
For the ancient Maya, lightning was raw power. It was basic to all creation and destruction. Because of this, the ancient Maya carved and painted many images of K’awiil. Scribes wrote about him as a kind of energy – as a god with “many faces,” or even as part of a triad similar to Huracán.
He was everywhere in ancient Maya art. But he was also never the focus. As raw power, he was used by others to achieve their ends.
Moreover, Maya artists always had K’awiil doing something or being used to make something happen. They believed that power was something you did, not something you had. Like a bolt of lightning, power was always shifting, always in motion.
An interdependent world
Because of this, the ancient Maya thought that reality was not static but ever-changing. There were no strict boundaries between space and time, the forces of nature or the animate and inanimate worlds.
Residents wade through a street flooded by Hurricane Helene, in Batabano, Mayabeque province, Cuba, on Sept. 26, 2024. AP Photo/Ramon Espinosa
Everything was malleable and interdependent. Theoretically, anything could become anything else – and everything was potentially a living being. Rulers could ritually turn themselves into gods. Sculptures could be hacked to death. Even natural features such as mountains were believed to be alive.
The illusion is not that different things exist. Rather it is that they exist independent from one another. Huracán, in this sense, damaged himself by damaging his creations.
Hurricane season every year should remind us that human beings are not independent from nature but part of it. And like Hurácan, when we damage nature, we damage ourselves.
The three deer photos show them feeding from me putting out COB (corn, oats, barley) each morning soon after it is light.
Of course, typically the morning I took my camera out there were just four deer. Usually there between seven and fifteen and a couple of months ago a friendly stag in getting to the COB as I was pouring it out rubbed his right antler on my right leg.
For most dogs, their friend groups usually consist of a mix of humans and other dogs. But Lili, a 3-year-old dog who lives on a French Polynesian atoll called Fakarava, isn’t like most other dogs. She prefers friends who have gills and fins. In fact, her very best friend is a shark.
Ever since Lili’s mom, Emmanuelle Larchet, adopted Lili, she’s known that her dog has an affinity for all things aquatic. She started swimming in the lagoon near Larchet’s house when she was only a month old.
“She’s really a water dog,” Larchet told The Dodo.
There are around 100 sharks who live in this lagoon near Larchet’s house. So when Lili swims in the water there, she’s surrounded by them. While many dog parents would be terrified to see their dog swimming amongst sharks, Larchet knows that the sharks Lili swims with are nurse sharks, who are actually very docile creatures.
“We call them sea puppies because [they’re] like dogs, actually … They are very nice,” Larchet said.
Larchet likes to joke that when Lili swims around with her shark friends, it’s sea puppies meeting earth puppies.
Over the years Lili has been swimming in the lagoon, there’s one shark in particular she’s grown especially close with. His name is Sharky, and he and Lili visit each other almost every day. Larchet and Lili are able to recognize Sharky because he has a special marking on one of his fins.
Lili and Sharky like to explore their lagoon together. They enjoy splashing around in the warm, clear water.
“He comes to say hello every time she sees him,” Larchet said.
Even though Lili and Larchet are best friends themselves, Larchet is more than happy to share her Lili with Sharky. And even though Larchet watches Lili hang out with her shark friends all the time, it never gets old seeing them spend time together.
“[When] I see her swimming with Sharky, [I’m] so happy,” Larchet said.
I follow Patrice Ayme and have done for many years. Some of his posts are super-intellectual and those I struggle to understand.
But a post published on September 8th, 2024 was very easy for me, and countless others no doubt, to understand and I have pleasure in republishing it on Learning from Dogs today.
I doubt that there are civilizations around. We are facing a galaxy devoid of intelligent aliens: little green mats out there, not little green men.
First, we don’t see them. With foreseeable technology (hibernation, nuclear propulsion, compact thermonuclear reactors, bioengineering, AI, quantum computers) we should be able to send very large interstellar spaceships at 1,000 kilometers per second… Thus it would take a millennium to colonize the Centaur tri-star system…. 25,000 years to colonize a 200 light years across ball… And the entire galaxy in ten million years… Wars would only accelerate the expansion. So if there was a galactic civilization, within ten million years it would have spanned the entire galaxy and its presence should be in sight.
Second, life took nearly four billion years to evolve animals. Bacterial life could have been nearly extinguished on Earth many times…. Be it only during the Snowball Earths episodes. A star whizzing by could have launched a thousand large comets. The large planets could have fallen inward.
Third, ultra intelligent life may not be able to have hands or tentacles and thus develop industry. Once intelligent life forms have evolved, say sea lions or parrots, let alone wolves, they may just be sitting ducks for the next disaster which would revert life to the bacterial level, erasing billions of years of evolution.
Fourth, when civilization is launched, it can fail… And not get a second chance (from lack of availability of mines after easy picking during the initial civilization).
So I don’t expect little green men… Besides those sent by the perverse Putin…
Just when we thought we knew of all the stress, here is another one: if we go extinct, the universe loses its soul! We have thus found a new Superior Moral Directive: SUS, Save Unique Soul!
Expect little green mats, not little green men.
Patrice Ayme
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A couple of weeks ago I gave a talk to our local Freethinkers group and called it The Next Ten Years. It began, thus:
This presentation is about the world of the future; of the near future. And the biggest issue, most agree, is the change in the climate.
The Global Temperature anomaly, as of last year, 2023, is 1.17 Centigrade, 2.11 Fahrenheit, above the long-term average from 1951 to 1980. The 10 most recent years are the warmest years on record.
Antoine de Saint-Exupéry is quoted as saying that ‘a goal without a plan is just a wish.’ So my plan is to show you how we can change, no let me put that more strongly, how we must change in the next ten years. Because our present habits are ruining the world.
As I said to Jeannie the broadcast really spoke to me as each morning I am in awe of the black-tailed deer that I go down to feed near the old stables just outside the house.
Then I pause on my way back and look at Mount Sexton and the rising sun; again I am in awe.
Then at night, being a crystal-clear sky on many occasions, I am in awe at the heavens above.
The programme spoke of one being in awe of both the small and the large and I want to close with two of my photographs of me sensing awe in both scales.