Tag Archives: Atmospheric

Amazon Rainforest Faces Drought as Deforestation Disrupts Atmospheric Rivers

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Deforestation in the Amazon

Vast areas of the Amazon rainforest are cleared for cattle ranching

Michael Dantas/AFP via Getty Images

The alarming rate of deforestation is significantly diminishing rainfall patterns across the Amazon, indicating that this vital rainforest could hit a catastrophic tipping point sooner than previously anticipated.

Research from 1980 to 2019 indicates that rainfall in the southern Amazon basin has diminished by 8 to 11 percent, based on satellite data and rain gauge readings. During this same time frame, tree cover in the region has shrunk by 16 percent, primarily due to deforestation linked to beef cattle ranching.

Contrastingly, deforestation has been less pronounced in the northern Amazon Basin, where precipitation has only shown minor increases that lack statistical significance.

Recent research highlights that deforestation contributes to arid conditions within a 300-kilometer radius. This new analysis reveals that this effect spans over a basin wider than 3,000 kilometers, suggesting that deforestation harms not just forests, but also the productivity of adjacent ranches and soybean farms, according to Dominique Spracklen from the University of Leeds.

“Some in agribusiness may perceive sections of the forest as underutilized land. Yet, these forests play a crucial role in maintaining regional rainfall, which in turn benefits our agricultural practices,” Spracklen explains.

Global warming is exacerbating the drying of the Amazon, culminating in extreme droughts and unprecedented wildfires in 2024. However, atmospheric studies led by Spracklen and colleagues indicate that deforestation is responsible for 52 to 75 percent of the decline in rainfall.

Moisture from the Atlantic Ocean is transported by prevailing winds into the Amazon, where it precipitates as rain. Plants contribute to this cycle as evaporation and transpiration return about three-quarters of that water to the atmosphere. Further downwind, it falls again as rain through multiple cycles, creating “flying rivers” that distribute moisture across the rainforest.

When forested areas are destroyed, over half of the rainwater is redirected to rivers and subsequently returns to the ocean, depleting the moisture available for the flying rivers and leading to reduced rainfall. Additionally, this diminishes atmospheric instability necessary for storm cloud formation, Spracklen and his team discovered.

As fewer trees slow down the wind, it tends to pick up speed, removing more moisture from the area.

Unlike previous research, this study employs a combination of data and modeling to effectively illustrate how deforestation impacts rainfall patterns, asserts Yadvinder Malhi from Oxford University.

“The atmosphere becomes smoother and, in a sense, slipperier. There’s reduced friction with the ground, enabling moisture to travel further out of forested regions,” Malhi notes, emphasizing the significance of secondary atmospheric processes often overlooked in prior studies.

Scientists voice concerns that the cumulative impact of heightened temperatures, drought, and deforestation could push the Amazon rainforest to a tipping point where it transitions into a savannah ecosystem, although the timeline for this transition remains uncertain. Spracklen and his colleagues found that climate models may underestimate the influence of deforestation on rainfall by as much as 50 percent, implying that the rainforest could face significant threats earlier than anticipated.

According to a 2022 study, there is a 37% probability that certain regions of the Amazon could vanish by 2100 if global temperatures, currently at 1.4°C, rise to 1.5°C. However, this does not necessarily imply that rainforests will convert into savannahs; it may lead to the emergence of fewer species and scrub forests capable of storing less carbon.

“The Amazon’s sensitivity is greater than we previously imagined, which is troubling,” he states. “We may be closer to the deforestation threshold than we realize, although there remains significant uncertainty surrounding this issue.”

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Source: www.newscientist.com

As Atmospheric Rivers Persist, Washington’s Infrastructure Faces Collapse.

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Numerous levees have collapsed, over a dozen highways have been shut down, and one fatality has been reported in Washington state as an atmospheric river storm continues to hammer the area, putting its infrastructure to the test.

Although the state’s dams and levees managed to withstand the initial wave of last week’s storms, the ongoing rainfall is beginning to overwhelm some levees.

Additionally, various low-lying areas in Western Washington remain inundated with slowly subsiding floodwaters.

During a news conference on Tuesday, Governor Bob Ferguson reported that there have been over 1,200 rescues across 10 counties since December 8. Thirteen state highways remain closed, and Highway 2, a key route across the Cascades, may remain shut for months. Interstate 90, the largest highway in the state, is also blocked due to a significant landslide.

“Our infrastructure is under significant strain,” Ferguson stated. “It has been compromised.”

Flooding occurred on Francis Road in Skagit County, Washington on Friday.
Evan Bush/NBC News

A 33-year-old man lost his life early Tuesday in Snohomish County, north of Seattle, when his car veered off into a ditch on a submerged rural farm road.

“We believe this marks the first fatality linked to this storm,” Ferguson commented, noting it was somewhat miraculous that there haven’t been additional casualties.

Courtney O’Keefe, public information director for the Snohomish County Sheriff’s Office, stated that the man was driving a Chevrolet Tahoe that drove through a traffic stop as his car began to flood. He called a friend, prompting them to contact 911 for help.

“There’s a ditch right next to the road. During flooding, it’s challenging to determine where the road ends and the ditch starts,” O’Keefe noted, mentioning that the tragic accident is still being investigated.

In the last two days, two levees have failed in the suburbs of Seattle.

The latest incident occurred Tuesday morning in the town of Pacific, close to the White River.

“A leak as wide as a fire hose was detected last night around 12:30,” informed Sheri Badger, a spokeswoman for the King County Emergency Management Agency. “It has since increased to approximately 120 feet in length.”

The semi-permanent embankment was built with HESCO Barrier, a mesh and fabric structure filled with sand, earth, and gravel. Badger explained that barriers were stacked atop one another, with water seeping through the gaps.

An evacuation advisory has been issued for 1,300 residents in the area. Crews are actively adding sandbags and “super sacks” to reinforce the breach.

On Monday, a six-foot section of another levee gave way in Tukwila, a locality on the Green River south of Seattle. King County ordered an evacuation for around 1,100 individuals, but crews managed to promptly repair the breach, limiting the damage.

The embankment had been previously damaged by flooding about four years ago and remained partially unrehabilitated.

At least two dams are currently being monitored for cracks or potential failures, according to the state Department of Ecology. One such dam is Lake Sylvia Dam, which is classified as “poor condition” with “significant” risks as per the National Inventory of Dams, with the last inspection conducted in November 2024. It was built in 1918.

Spokesman Andrew Weinke indicated that several roads could be at risk in the event of a dam failure, but there would be no immediate repercussions for homes or residents.

Much of western Washington is traversed by rivers that flow steeply from the Cascade Mountains. These rivers, which drain into Puget Sound, historically meandered across wide floodplains, forming a complex network. However, over a century ago, much of it was dammed and straightened for potable water, flood control, and hydroelectric energy generation. As a result, streams evolved into channelized rivers, akin to superhighways for water flow.

Since that time, levee systems have been reinforced to contain the water, with homes and industrial buildings often constructed near the floodplain’s edges.

Certain areas that have experienced severe flooding previously are likely to be inundated again.

On Monday, a house was surrounded by floodwaters in Sumas.
Brandon Bell/Getty Images

Atmospheric rivers, such as the recent storm systems, appear like fire hoses on weather radar.

These storms are often referred to as the “Pineapple Express” as they can carry humidity and warmth from Pacific waters near Hawaii and other tropical regions.

The Pacific Northwest typically handles one or two of these storms without significant impact; however, three heavy rain events have occurred since December 8. Some parts of the North and Central Cascades received up to 16 inches of rain within three days, making them the steepest and most rugged mountains in the continental United States.

“The atmospheric river phenomenon was considerable, but not unprecedented,” stated state climatologist Guillaume Mauger. “What stands out is the consecutive nature of these storms.”

Members of a Sumas household were working on Monday to repair their homes, which were flooded during last week’s heavy rains.
Brandon Bell/Getty Images

He noted that more intense river flooding is anticipated in the future as rising temperatures will lead to increased rainfall rather than snowfall. As the climate warms, rainfall also tends to become more intense.

One study predicts flooding along the Skagit River by the end of this century, with potential volumes increasing by nearly 50% every 100 years by the 2080s. Given that the river already has dams, existing flood control measures are deemed “mostly ineffective,” the study found.

Mauger suggested that the best approach to mitigate future risks is to provide rivers with more space.

As more storms are on the horizon, dam operators are compelled to redirect water to upstream reservoirs to avert potential flooding.

John Taylor, Director of King County Natural Resources and Parks, mentioned that officials are closely monitoring several levees of concern and reinforcing those known to be weak.

“We’ve noticed that levees, which typically perform well during floods, are starting to fail due to saturation and significant pressure,” he explained.

The Skagit and Snoqualmie rivers are expected to reach or surpass major flood stage by Thursday morning.

Source: www.nbcnews.com

In 2024, Atmospheric CO2 Levels Are Set to Reach New Heights.

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Wildfires like the one in Greece in 2024 emitted significant quantities of carbon dioxide.

Xinhua News Agency/Alamy Stock Photo

The World Meteorological Organization (WMO) has disclosed that atmospheric carbon dioxide levels are set to soar to unprecedented heights in 2024, reaching levels not seen since records began.

According to WMO, the global average CO2 concentration is projected to rise by 3.5 ppm from 2023 to 2024, reaching 423.9 ppm. This marks the largest increase observed since modern measurements began in 1957, significantly surpassing the 2.3 ppm rise from 2022 to 2023.

This continues a troubling trend of accelerating increases each year, with the growth rate tripling since the 1960s. The last instance of comparable CO2 levels on Earth dates back 3 to 5 million years.

The WMO cautions that surplus carbon dioxide in the atmosphere will lead to global warming effects for centuries. “The heat captured by CO2 and other greenhouse gases is speeding up climate change and causing increasingly severe weather events,” stated Ko Barrett from the WMO.

Continued emissions from fossil fuels, a rise in emissions from wildfires, and a slow rate of carbon dioxide absorption by the planet’s land and oceans were identified as the primary factors behind last year’s record rise, as per WMO’s reports.

Researchers are forecasting that carbon uptake by oceans, forests, and other ecosystems will slow down in 2024 due to recent El Niño weather patterns, which have increased global temperatures and caused heatwaves, wildfires, and droughts in significant areas like the Amazon, thereby hindering carbon absorption. Scientists earlier this year indicated that the loss of tropical forests in 2024 will double compared to 2023. “In certain tropical regions, warm El Niño years like 2024 are generally drier and sequester less carbon dioxide,” noted Richard Allan from the University of Reading, UK.

Nevertheless, there are growing concerns that the decline in carbon uptake by Earth, particularly from land, is indicative of a long-term trend, suggesting that climate change is diminishing the planet’s capacity to absorb excess carbon.

“There are indications that land subsidence was markedly low in 2023 and 2024, even amidst the El Niño conditions, and we are witnessing a troubling decline over time, especially in the Northern Hemisphere outside of tropical regions,” said Zeke Hausfather, a climate scientist at the Breakthrough Institute. “In summary, there are alarming signs that land subsidence is decreasing, but it’s premature to make definitive conclusions without additional data over the coming years.”

In the meantime, it is more critical than ever for humanity to reduce ongoing fossil fuel emissions. Piers Foster, from the University of Leeds, UK, explained, “The primary factor driving the persistent increase in CO2 concentrations is that fossil fuel emissions remain at record levels and have yet to decline.”

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Source: www.newscientist.com

Atmospheric Disturbance Caused Temperature Surge in Antarctica

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The Antarctic is experiencing higher temperatures than expected

Eyal Bartov / Alamy

Since early September, air temperatures in Antarctica have soared beyond 35°C (63°F), accompanied by a significant reduction in wind speeds, with ozone depletion halting unexpectedly.

This scale of change is typically anticipated only every two decades, according to Martin Zicker from the University of New South Wales, Sydney, Australia. However, such phenomena appear to be occurring with increasing frequency, with similar transient disruptions noted last year, alongside more severe occurrences in both 2019 and 2002.

Jucker observes that four of these events have appeared within just 25 years, indicating ongoing unpredictable shifts in the global climate system.

Typically, air temperatures in Antarctica hover around -55°C (-67°F), but have been unrelentingly rising to -20°C (-4°F) since September 5th. Although still extremely cold, this shift has resulted in the polar vortex winds decreasing relatively gently to 100 km/h.

While this warming event has not yet met the formal criteria for sudden stratospheric warming, Jucker notes that for that classification to apply, the winds need to cease entirely—not just for weeks but in response to the warmth itself. He warns that the repercussions in the Southern Hemisphere could be dramatic over the ensuing months.

Initially, Australian meteorologists forecast a wetter spring than normal, but they are now signaling potential impacts from a powerful system over western Australia, likely pushing the region into warmer and drier conditions.

Unusual weather patterns may persist. Jucker indicates that one possible scenario could see a return of the polar vortex, bringing atmospheric temperatures back to their typical averages.

Conversely, the temperature anomaly might continue, with expectations of further increases up to 20°C (36°F). This could lead to erratic weather in the higher latitudes of the Southern Hemisphere.

The reason behind this anomaly remains unclear scientifically, but Jucker asserts that it’s almost guaranteed that rising sea surface temperatures in the Pacific Ocean, possibly increasing by 1°C (1.8°F) to 3.6°F, are connected.

“The presence of three significant typhoons in the Pacific can be traced to these warmer sea temperatures,” remarks Jucker. “We’ve witnessed markedly strange weather patterns over the last two years, coinciding with this substantial rise in ocean temperatures.”

Edward Dodridge from the University of Tasmania in Hobart, Australia, emphasizes the array of extreme changes occurring at the southernmost point of the globe. Recent years have seen a dramatic deceleration in sea ice loss, heatwaves, widespread breeding failures among Emperor Penguin colonies, and shifts in Antarctic circulation.

“Antarctica continues to astonish us,” he notes. “While each change is noteworthy on its own, my primary concern is witnessing shifts that not only reinforce themselves but also ripple through various components of the Antarctic ecosystem.”

“The loss of summer sea ice facilitates the fracturing of ice shelves, which in turn accelerates ocean warming. This warmer seawater melts the remaining ice shelves at an increased rate.”

Fire and Ice: Exploring Iceland

Experience thrilling days filled with volcanic and geological exploration. Discover Iceland’s stunning landscapes and seize the evening chance to witness the Aurora Borealis in October.

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Source: www.newscientist.com

Rising Atmospheric Hydrogen: A Potential Climate Concern

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Hydrogen can indirectly warm the atmosphere

axa/esa

Hydrogen levels in the atmosphere have surged by 60% since the pre-industrial era, underscoring the significant influence of fossil fuel use on the Earth’s atmospheric makeup. While hydrogen itself isn’t a greenhouse gas, it contributes to warming indirectly through its interactions with other substances.

The research findings stem from the first comprehensive long-term observations of atmospheric hydrogen, which are derived from ice core data collected in Greenland in 2024. “Ice core records are incredible,” notes Alex Archibald from Cambridge University.

Being a small and lightweight molecule, hydrogen tends to escape into the atmosphere easily, often leaking from the ice core before it is analyzed in the lab.

To tackle this issue, John Patterson from the University of California, Irvine, and his team examined the ice core samples right after extraction. “We took our equipment out onto the ice. As soon as we extracted the samples, we cleaned and sealed them in a melted chamber for analysis,” he explains.

This approach enabled the researchers to establish a long-term record of atmospheric hydrogen stretching back 1,100 years, marking a significant improvement over previous records that reached only 100 years, largely based on observational data and snowfall analyses. “It’s quite an impressive feat logistically. We’re excited to share these findings,” remarks David Stevenson from the University of Edinburgh, UK.

The study discovered that hydrogen concentrations have risen from roughly 280 parts per billion in the early 19th century to around 530 parts per billion today. According to Patterson, this is not surprising given the rapid increase in fossil fuel usage since the pre-industrial period—when fossil fuels or biomass burn, hydrogen is released as a by-product.

Patterson and his team merged data from ice core records with modeling efforts to illustrate the fluctuations in hydrogen levels over the millennium. “Our data reveals changes in atmospheric composition, but the reasons behind these changes remain unclear,” says Patterson. “We aim to utilize biogeochemical models to investigate these variations.”

Ice cores can reveal historical hydrogen levels in the atmosphere

John Patterson

For instance, evidence from ice cores indicates that atmospheric hydrogen levels dipped by 16% during the so-called Little Ice Age, a cold period from the 16th to the 19th century. The decrease in wildfire emissions during this time does not completely account for the notable drop in hydrogen concentrations, according to Patterson. “This suggests that natural hydrogen biogeochemistry is adapting to climate change in ways we still don’t fully comprehend. This unexpected finding could be significant for future scenarios, indicating that atmospheric hydrogen levels might be more sensitive to climate fluctuations than previously believed,” Patterson cautions.

In the atmosphere, hydrogen competes with methane and engages with hydroxyl radicals, which play a crucial role in eliminating methane from the atmosphere, a potent greenhouse gas. “As hydrogen levels rise, the amount of hydroxyl available to react with methane decreases,” explains Patterson, potentially enhancing methane’s warming effect. “Currently, hydrogen constitutes about half of the total in the atmosphere, contributing approximately 2% to the overall anthropogenic warming effect according to our best estimates.”

Gaining a deeper understanding of the hydrogen cycle is essential to assess whether the widespread adoption of hydrogen fuels, as a transition away from fossil fuels, might lead to unanticipated consequences. For instance, a sudden spike in atmospheric hydrogen could magnify the warming impact of methane. Methane emissions have consistently risen since 2007, influenced by fossil fuel production, agriculture, and warming that releases stored methane from wetlands and permafrost.

“Methane is a significant factor causing us to hesitate in endorsing a hydrogen economy, as it inevitably leads to hydrogen leaks into the atmosphere,” emphasizes Archibald. “If hydrogen escapes into the atmosphere, it worsens the methane issue.”

It might spark discussion over the cautious use of hydrogen, especially if renewable energy cannot sufficiently replace fossil fuels, according to Archibald. Nonetheless, Patterson and other experts highlight that the warming effects from increased hydrogen use are expected to be minimal compared to the considerable warming impact of fossil fuels. “We don’t want to discourage people from pursuing hydrogen energy, as it’s a much cleaner option than its fossil fuel counterparts,” emphasizes Patterson.

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Source: www.newscientist.com

Webb Reveals the Atmospheric Structure of Sub-Neptune TOI-421B

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Subneptin is a type of exoplanet characterized by high birth discharge thrombosis and lacks analogs within our solar system. Significantly smaller than gas giants, and typically cooler than Hot Jupiter exoplanets, these worlds were notably challenging to study before the launch of the NASA/ESA/CSA James Webb Space Telescope. Many subneptins are obscured by thick clouds and hazards, hindering our ability to analyze their atmospheric structures. Utilizing the Webb, astronomers have obtained the transmission spectrum of subneptin TOI-421B, unveiling its atmospheric chemical signatures.

Artist’s impression of Subneptune Exoplanet TOI-421B. Image credit: NASA/ESA/CSA/DANI player, STSCI.

TOI-421 is a solar-type star located approximately 245 light years away in the constellation of Repas.

Commonly known as BD-14 1137, this star is around 10 billion years old and hosts at least two giant exoplanets.

The inner planet, TOI-421B, is a subneptin with a radius of 2.65 times that of Earth and boasts a high equilibrium temperature of 647 degrees Celsius (1,197 degrees Fahrenheit).

“Prior to Webb, scientists had scant information regarding subneptins,” stated University of Maryland astronomer Brian Davenport and his team.

“These planets are several times larger than Earth, yet still much smaller than gas giants, usually cooler than hot Jupiters, and significantly harder to observe than their larger gas analogs.”

“A crucial finding before Webb was that many Neptune-like atmospheres exhibited flat or featureless transmission spectra.”

“This indicates that when scientists scrutinized the spectrum of planets transiting in front of a host star, they only observed flatline spectra, missing the details of the spectrum (chemical fingerprints revealing atmospheric composition).”

“Based on these flatline spectra observations, it was concluded that certain subneptins are extremely obscured, potentially due to clouds or haze.”

“Why did we focus on planet TOI-421B? Because we hypothesized it might be an exception,” said Eliza Kempton, an astronomer at the University of Maryland.

“This hypothesis stemmed from previous data suggesting that planets within specific temperature ranges were less likely to be shrouded in haze or clouds.”

“The temperature threshold is around 577 degrees (1,070 degrees Fahrenheit); beneath this, it was assumed that complex photochemical reactions occur between sunlight and methane gas, leading to haze.”

TOI-421B, with a temperature of approximately 727 degrees Celsius (1,340 degrees Fahrenheit), is significantly above this threshold.

The transmission spectra of subneptune TOI-421B uncover the presence of water and potential indications of sulfur dioxide and carbon monoxide, without signs of carbon dioxide or methane. Image credits: NASA/ESA/CSA/Joseph Olmsted, STSCI.

Without the interference of haze or clouds, astronomers anticipated observing a clear atmosphere.

“We identified spectral features attributable to various gases, which empowered us to ascertain the atmospheric composition,” explained Davenport.

“In many previously studied subneptins, although I inferred that their atmospheres contained specific gases, they remained obscured by haze.”

Researchers have identified atmospheric water vapor along with tentative signatures of carbon monoxide and sulfur dioxide.

However, they did not find molecules such as methane and carbon dioxide.

From the gathered data, they speculate a substantial amount of hydrogen constitutes the atmosphere.

This prevalence of lightweight hydrogen was an unexpected revelation for scientists.

“We recently came to grips with the notion that one of the initial subneptins observed by Webb has a significant molecular atmosphere.

“This implies that TOI-421B may have formed and evolved differently compared to other cooler subneptins.”

“The hydrogen-rich atmosphere is intriguing, as it resembles the composition of its host star TOI-421B.”

“By incorporating the same gases that formed the host star into the planet’s atmosphere, and cooling them, one could replicate the same gas combination.”

“This process aligns more closely with the giant planets of our solar system, differing from previously observed subneptins through Webb.”

The team’s research paper was published this week in the Astrophysical Journal Letters.

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Brian Davenport et al. 2025. TOI-421B: High-temperature Neptune with a low average molecular weight atmosphere, haze-free. apjl 984, L44; doi: 10.3847/2041-8213/ADCD76

Source: www.sci.news

Hubble sheds light on atmospheric composition and dynamics of Uranus

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The 20-year Hubble study of Uranus provides valuable data to help you understand the atmospheric dynamics of this distant ice giant. This serves as a proxy for studying the deformation of similar sizes and compositions.

The image sequence shows changes in Uranus over the past four years when Hubble’s STIS instrument observed Uranus over 20 years. Over that period, astronomers saw Uranus season as the Antarctic region (left) entered winter shadows, and the Arctic region (right) brightened, and began to become more direct view as summer approached the north. The top row of visible light shows how Uranus’ colours look to the human eye, as can be seen by even amateur telescopes. In the second line, false-colored images of the planet are assembled from visible and near-infrared light observations. The color and brightness correspond to the amount of methane and aerosol. Both of these quantities were indistinguishable before STI first targeted Uranus in 2002. Generally, the green area has less methane than the blue area, and the red area does not show methane. The red area is in the limbs, where the stratosphere of Uranus is almost completely free of methane. The two bottom rows show the latitudinal structures of aerosols and methane, inferred from those visible from 1,000 different wavelengths (colors) to near-infrared. In the third row, bright areas show cloudy conditions, while dark areas show clearer conditions. In the fourth row, the bright areas show depleted methane, and the dark areas show the total amount of methane. At mid- and low-latitude latitudes, aerosol and methane depletion has a unique latitude structure that has changed little over 20 years of observation. However, in polar regions, aerosol and methane depletion behave very differently. In the third row, aerosols near the Arctic show a dramatic increase, becoming very dark in the early days of the Northern Spring and very bright in recent years. It appears that aerosols also disappear in their left limbs when solar radiation disappears. This is evidence that solar radiation alters aerosol haze in Uranus’s atmosphere. On the other hand, methane depletion appears to remain very high in both polar regions throughout the observation period. Image credits: NASA/ESA/Erich Karkoschka, LPL.

Uranus is a giant ice planet about four times the diameter of Earth.

It has a hydrogen and helium feel and has a bit of methane that gives it a blue tint.

Uranus lies to its side and rotates, its magnetic field is biased – it tilts at the center 60 degrees from its axis.

When Voyager 2 passed Uranus in 1986, it provided a close-up snapshot of the planet facing sideways. What it saw resembled a bland blue-green billiard ball.

In comparison, Hubble recorded the story of 20 years of seasonal changes from 2002 to 2022.

During that period, it was used by a team of astronomers led by Dr. Erich Karkoschka of the University of Arizona and Dr. Larry Slomovsky and Dr. Pat Free of the University of Wisconsin. Hubble Space Telescope Imaging Spectrometer (stis) Draw an accurate picture of Uranus’ atmosphere structure.

Researchers observed Uranus four times in 20 years: 2002, 2012, 2015, and 2022.

They found that unlike gas giants Saturn and Jupiter, methane was not evenly distributed on Uranus.

Instead, it is heavily depleted near the pole. This depletion remained relatively constant for 20 years.

However, the structure of aerosols and hazes changes dramatically, and brightens significantly in the Arctic region as the planet approaches the northern summer solstice in 2030.

Uranus takes Earth age just over 84 years to complete the single orbit of the Sun.

Therefore, for over 20 years, the team has seen the spring almost north to make the Northern Pole shine directly in 2030, before shining the equator of Uranus.

“Hubble’s observations suggest a complex atmospheric circulation pattern for Uranus during this period,” the scientists said.

“The data most sensitive to methane distribution shows polar inundation and upwelling in other regions.”

Source: www.sci.news

Astronomers unveil the atmospheric composition of Topsitterby on a faraway planet

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Three layers of the atmosphere of a giant tyro gas

ESO/m. Cone Messer

The atmosphere of a distant world is mapped in detail for the first time, revealing a strange, dizzy weather system, and the fastest winds ever blew inexplicably around the Earth's stratosphere.

Astronomers have been studying the WASP-121B, also known as Tylos, since 2015. A planet 900 light years away is a vast ball of gas twice the size of Jupiter, and the stars orbit very closely and complete their perfect orbit. Only 30 Earth Time. This close orbit heats the planet's atmosphere to a temperature of 2500°C, and is hot enough to boil iron.

now, Julia Seidel Chile and her colleagues' observatory in southern Europe use a very large telescope at the observatory to see in the burnt, hot atmosphere of Tyros, with at least three different layers of gas in different directions around the planet. I found out there. I've seen it before. “It's absolutely crazy, it's a science fiction-like pattern and behavior,” Seidel says.

The atmosphere of our solar system planets is driven by the internal temperature difference, whereas the winds in the upper layers are more affected by the temperature difference, and the strong wind flows are more affected by the temperature difference. shares a similar structure to Created by the heat of the sun, it warms the daylight side of the planet, while the other warms.

However, in the atmosphere of Tyros, it is driven by heat from the planetary stars, and it is the lower wind that moves away from the warm surface, but the jetstream is primarily in the middle layer of the atmosphere, surrounding the equator of Tyros. It looks like it's moving. In the direction of the planet's rotation. The upper layer also exhibits jetstream-like characteristics, but hydrogen gas floats outward from the planet. This is difficult to explain using current models, Seidel says. “What we're looking at now is actually the opposite of what comes out of theory.”

Furthermore, Tylos' jetstream is the most powerful ever, blasting at about 70,000 km/h on half the planet. This is almost twice as much as the previous record holder. It is unknown what exactly drives this velocity, but researchers believe it is caused by the planet's strong magnetic field or by ultraviolet rays from the stars. “This could change the flow pattern, but this is all very speculative,” Seidel says.

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Source: www.newscientist.com

New Record High of Atmospheric Carbon Dioxide Levels Recorded at Monitoring Station

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Hawaii’s Mauna Loa Observatory has been recording atmospheric carbon dioxide concentrations since 1958.

Fred Espenak/Science Photo Library

Atmospheric carbon dioxide levels measured by Hawaii’s Mauna Loa Observatory weather station increased by 3.58 parts per million in 2024, the largest increase since records began in 1958.

‘We’re still going in the wrong direction,’ climate scientists say Richard Betts At the Met Office, the UK’s weather bureau.

Part of this record increase is due to carbon dioxide emissions from human activities such as fossil fuel burning and deforestation, which reached an all-time high in 2024. Added to this were numerous wildfires caused by record global warming driven by climate change. Long-term warming plus El Niño weather patterns.

Betts predicted that atmospheric carbon dioxide concentrations measured at Mauna Loa would rise by 2.26 parts per million (ppm) this year, with a margin of error of 0.56 ppm either way. This is significantly lower than the 2024 record, but it would exceed the last possible pathway to limiting the rise in global surface temperatures to 1.5°C above pre-industrial levels.

“You can think of this as another nail in the 1.5°C coffin,” Betts says. “Now that’s highly unlikely.”

Atmospheric carbon dioxide concentration is the most important indicator when it comes to climate change, as increasing atmospheric carbon dioxide concentration is the main driver of short- and long-term warming. The first continuous measurements of CO2 levels were taken at Mauna Loa.

“Because this station has the longest observation record and is located far from major anthropogenic and natural sources of CO2 emissions and sinks, it is often used to represent changes in global CO2 concentrations. It will be done.” Richard Engelen At the EU’s Copernicus Atmospheric Monitoring Service.

However, observations from satellites have made it possible to directly measure the global average atmospheric carbon dioxide concentration. According to CAMS, it rose by 2.9 ppm in 2024. Although this is not a record, it is one of the largest increases since satellite observations began.

“The reasons for this large increase require further investigation, but are likely a combination of a recovery in emissions in much of the world after the coronavirus pandemic and interannual fluctuations in natural carbon sinks.” says Engelen. Carbon sinks refer to marine and terrestrial ecosystems that absorb about half of the carbon dioxide emitted by humans.

It has long been predicted that as the Earth warms, this excess CO2 will become less absorbed. “The concern is whether this is the beginning of that,” Betts said. “We don’t know.”

At Mauna Loa, carbon dioxide increases will be higher than global average levels in 2024 due to the large number of wildfires in the Northern Hemisphere, Betts said. CO2 plumes from sources such as wildfires take time to mix evenly into the world’s atmosphere. “Fire emissions in the Northern Hemisphere were particularly high last year,” he says.

Although it is now certain that global warming will exceed the 1.5°C threshold, Betts believes it is still the right goal to set that goal. “The Paris Agreement is carefully worded to seek to limit global warming to 1.5%. We recognized from the beginning that this would be difficult,” he says. “The idea was to set this stretch goal to motivate action, and I actually think it was successful. It galvanized action.”

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Source: www.newscientist.com

Study finds that atmospheric lead pollution in Roman Europe led to widespread cognitive decline

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Researchers examined records from three ice cores to determine levels of lead pollution in the Arctic from 500 BC to 600 AD. The presence of lead isotopes allowed the authors to identify mining and smelting operations across Europe as possible sources of contamination during this period. Advanced computer modeling of atmospheric movement was then used to map atmospheric lead pollution levels across Europe. Combined with studies linking lead exposure to cognitive decline, scientists also saw a 2.5 to 3 point drop in intelligence quotient across the Roman Empire.

A 4th century AD bronze and silver coin found in Lod, central Israel. Image credit: Israel Antiquities Authority.

“This is the first study to take pollution records from ice cores and calculate them backwards to get pollution concentrations in the air and assess the impact on humans,” said Desert Research Institute researcher Dr. Joe McConnell. said.

“The idea that we could do this 2,000 years ago is very novel and exciting.”

Dr Andrew Wilson, a historian at the University of Oxford, said: 'Our research uncovers precise links between records of lead pollution and historical events such as population declines associated with periodic epidemics and pandemics. , which changed our understanding of the Roman period.”

Ancient lead pollution was primarily caused by silver mining, where the lead-rich mineral galena was melted down to extract the silver.

This process produced thousands of ounces of lead for every ounce of silver, much of which was released into the atmosphere.

In adults, high levels of lead exposure have been linked to infertility, anemia, memory loss, cardiovascular disease, cancer, and decreased immune responses, among others.

In children, even low levels of exposure are associated with lower IQ, poorer concentration, and poorer academic performance.

Meanwhile, the US CDC I will consider There is no risk-free lead exposure level, as a blood lead level of 3.5 μg/dl is the point for medical intervention in children.

Dr Nathan Chellman, a researcher at the Desert Research Institute I decided to focus on that.”

“A two to three point drop in IQ doesn't seem like a big deal, but when you apply this to basically the entire European population, it becomes quite significant.”

The researchers found that atmospheric lead pollution began in the Iron Age and peaked during the height of the Roman Republic in the late 2nd century BC.

It then declined sharply in the 1st century BC during the crisis of the Roman Republic, but increased around 15 BC with the rise of the Roman Empire.

Lead contamination remained at high levels from 165 AD until the Antonine Plague of the 180s, which seriously affected the Roman Empire.

It was not until the High Middle Ages, at the beginning of the second millennium AD, that lead pollution in the Arctic exceeded the persistently high levels of the Roman Empire.

Research shows that during the height of the Roman Empire, which spanned nearly 200 years, more than 500,000 tons of lead were released into the atmosphere.

“Ice core records show that lead pollution in the Arctic was up to 40 times higher at its historic peak in the early 1970s, but the insights gained from this study show that lead pollution in the Arctic was up to 40 times higher at its historic peak in the early 1970s, but It shows how it has impacted health,” Dr. McConnell said.

of study Published in Proceedings of the National Academy of Sciences.

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Joseph R. McConnell others. 2025. Roman mining and smelting led to atmospheric lead pollution across Europe, increased blood lead levels, and decreased cognitive function. PNAS 122 (3): e2419630121;doi: 10.1073/pnas.2419630121

Source: www.sci.news

Pacific Northwest prepares for severe weather from ‘bomb cyclone’ and atmospheric river

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Thousands of homes lost power, as downed power lines and trees blocked highways in Washington state on Tuesday due to a powerful atmospheric river event, officials announced.

Forecasters stated that a storm could bring up to 15 inches of rain and heavy snowfall in the mountains. By 7 p.m. local time, about 100,000 homes and businesses in Washington and over 14,000 homes in Oregon were without power, as reported by news agencies on the Rack Website poweroutage.us.

The Bellevue, Washington, fire department warned, “Trees are falling across the city, hitting homes.” They advised residents to stay away from windows and not to go outside if possible. X was contacted on Tuesday around 8pm.

Weather forecasters warned of a whiteout snowstorm in the Cascade Range and possible 2 feet of snow in Mount Shasta, Northern California, along Interstate 5. High wind gusts of up to 90 mph were recorded on Mount Rainier and 52 mph in Seattle-Tacoma International Airport.

Known as bomb cyclones, these intense winds are caused by rapidly intensifying storm systems with decreasing atmospheric pressure. Scientists attribute this phenomenon to climate change generating more atmospheric rivers, which are significant contributors to precipitation on the West Coast.

An atmospheric river storm could bring significant rainfall over a three-day period in Northern California, with a flood watch issued in several areas. These storms help replenish water supplies after dry summers, but can also lead to severe flooding and damage.

Satellite images show a weather system moving towards the Pacific Northwest, prompting concerns of damaging winds, rain, and snow. Climate scientists are closely monitoring the storm and its potential impacts on various regions.

Satellite images show the weather system moving closer to the Pacific Northwest on Tuesday morning.
NOAA

As the storm progresses, residents in affected areas are advised to stay updated on weather alerts and follow safety guidelines to minimize risks and potential damage.

Source: www.nbcnews.com

Chemists show the existence of sulfurous acid in the gas phase in normal atmospheric conditions

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Chemists at the Leibniz Institute for Tropospheric Research have discovered that sulfurous acid (H2So3), once formed in the gas phase, is kinetically stable enough to allow its characterization and subsequent reactions.

In the gas phase, sulfurous acid, once formed, exhibits some kinetic stability with a lifetime of at least 1 second in atmospheric water vapor conditions. Image courtesy of Berndt others., doi:10.1002/anie.202405572.

Sulfurous acid Having formula H2So3 The molecular weight is 82.075 g/mol.

This molecule, also known as sulfuric acid(IV) or thioic acid, is a difficult-to-reach acid that has never before been observed in aqueous solution.

However, sulfite Detected It was discovered in the gas phase in 1988 by dissociative ionization of diethyl sulfite.

“The only experimental detection of sulfurous acid to date was achieved in 1988 by the team of Helmut Schwarz at the Technical University of Berlin using in situ generation with a mass spectrometer,” said Dr. Torsten Berndt of the Leibniz Institute for Tropospheric Research and colleagues.

“Under vacuum conditions, we estimated an extremely short lifetime of more than 10 microseconds.”

“Theoretical calculations show that H2So3 As a possible reaction product of the gas-phase reaction of OH radicals with dimethyl sulfide (DMS), which are produced from ozone and water molecules in the troposphere primarily in the presence of ultraviolet light.”

“DMS is produced primarily by biological processes in the ocean and is the largest source of biogenic sulfur in the atmosphere, producing approximately 30 million tonnes per year.”

The researchers experimentally investigated possible reaction pathways to H.2So3 It starts with DMS.

Formation of H2So3 Its formation in the gas phase was clearly demonstrated in a flow reactor under atmospheric conditions.

“Under our experimental conditions, sulfurous acid remained stable for 30 seconds, regardless of humidity,” the researchers said.

“With the existing experimental setup, longer residence times have not yet been explored.”

“Therefore, H2So3 It may persist in the atmosphere long enough to affect chemical reactions.”

“The observed yields were somewhat higher than theoretically expected.”

According to related model simulations, about 8 million tons of H2So3 They form every year all over the world.

“In this pathway, the mass of H increases by about 200 times.2So3 Sulfuric acid (H2So4“It produces carbon dioxide (CO2) from dimethyl sulfide in the atmosphere,” said Dr Andreas Tilgner and Dr Eric Hofmann from the Leibniz Institute for Tropospheric Research.

“The new results may contribute to a better understanding of the atmospheric sulfur cycle.”

Team paper Published in the journal Applied Chemistry.

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Torsten Berndt others2024. Gas-phase production of sulfurous acid (H)2So3) floats in the atmosphere. Applied Chemistry 63(30):e202405572;doi:10.1002/anie.202405572

Source: www.sci.news

California’s atmospheric rivers pose higher landslide risk

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Recent rains have accelerated land movement in the landslide-prone coastal city of Rancho Palos Verdes in Los Angeles County, altering previously uncharted landslide areas, as stated in a city news release.

The sedimentary rock layers in the area tilt toward the sea, causing clay layers to expand and become slippery when saturated with water due to minimal friction, explained Onderdonk.

Concerning areas are expanding due to heavy rains, with a decades-old plan to dewater slopes in the Avalon Cove landslide area significantly slowing down movement, but recent acceleration led to the closure of Wayfarer’s Chapel, designed by Frank Lloyd Wright Jr. in Avalon Cove.

The city of Rancho Palos Verdes, faced with risks to homes and roads, is urging Gov. Gavin Newsom to proceed with state and federal emergency declarations for expedited emergency fixes through the permitting process, as mentioned here.

Many coastal cities in California are vulnerable to landslides.

A tarp covers the bluff behind the house overlooking Capistrano Beach in Dana Point, California. Several seaside areas are dealing with concerns of landslides and coastal erosion following recent storms that hit the state.
NBC News

Drone footage of beach houses built on a landslide rubble in Dana Point made headlines recently. Scientists are studying how climate change affects landslides, expected to be detailed in a 2022 study in “Geophysical Research Letters.”

Research indicates that atmospheric river storms in the San Francisco Bay Area coincide with landslides about 76% of the time and are becoming more frequent and intense on the West Coast due to a warming atmosphere’s increased water vapor absorption and transport capacity.

A warming sea due to human-induced global warming is leading to rising sea levels, endangering California’s coastlines, with projections suggesting significant beach loss by 2100.

Edward and Debbie Winston-Levin, residents of Dana Point, express concerns about coastal erosion impacting their property and affecting nearby amenities.

After recent storms in California, Edwards, who lives in Dana Point, looks out at his waterfront home amid concerns about landslides and coastal erosion.
NBC News

Various coastal cities are making adaptations due to the changing landscape, with plans in motion to address potential risks and impacts.

Experts caution that protecting California’s iconic beaches while safeguarding cliffside homes poses a challenging dilemma for communities.

Source: www.nbcnews.com

California’s recovery from last year’s storms hindered by new atmospheric river floods

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As California prepares for another strong atmospheric river storm on Sunday, Lake Tulare serves as a reminder of the impactful effects these extreme storms can have.

The lake’s floodwaters, which were formed after approximately 12 atmospheric river storms hit California in 2023, are still present 9 months after the resurgence of the “ghost lake.” More than a month later, they still cover thousands of acres of prime farmland.

This summer, the stagnant water of the lake became a gathering place for wild birds and caused an outbreak of avian botulism. Wildlife officials had to patrol daily by airboat and collect hundreds of dead birds. Submerged flooded vehicles and communication equipment at the bottom of the lake left farmers unable to access their fields.

The continuing presence of the lake in this part of the Central Valley emphasizes how the environmental impacts of last year’s extreme rainfall are still affecting California. While this weekend’s storms could bring heavy precipitation to other parts of the state, most flooding effects are not expected to last long.

Currently, Lake Tulare is rapidly shrinking despite recent rainfall. As of Thursday, about 4,532 acres of farmland were still underwater, but the floodwaters have subsided, according to Kings County spokesman Justin Caporusso. This means the lake is now less than 20 times smaller than last year’s peak, and life is returning to normal for nearby residents.

Sgt. Nate Ferrier of the Kings County Sheriff’s Office, who visited the lake in late January, noted that much of the lake has been cleaned up.

“The farming community was already revitalized,” he said. “There were tractors everywhere.”

The lake was a natural feature of the southern San Joaquin Valley until settlers dug irrigation canals to reroute water and drain agricultural land more than a century ago. Last year, the Tulare Basin flooded after a series of storms because reservoirs could not handle heavy snowmelt runoff from the Sierra Nevada mountains.

Caporusso stated that this week’s atmospheric river storms, expected to be accompanied by a significant storm on Sunday, are unlikely to have a significant impact on Tulare Lake. The reservoir upstream of the lake has the capacity to handle the precipitation, and the California Department of Water Resources found that about 45% of normal snow falls in the southern Sierra Nevada during this period.

Source: www.nbcnews.com