Researchers report that oil-field emissions are reshaping regional atmospheric processes.
Earth’s climate is shifting rapidly, with the most dramatic changes occurring in polar regions. A team of researchers from Penn State has taken a close look at the Arctic atmosphere and uncovered a complex set of chemical processes that influence how the region is changing.
To conduct the study, scientists relied on data gathered during a two-month field campaign that combined measurements from two research aircraft with observations taken on the ground. This effort allowed them to compare atmospheric chemistry in two Arctic locations and in the largest oil field in North America with nearby, less disturbed areas.
From this work, the researchers identified three major findings. They determined that gaps in sea ice, known as leads, play a major role in shaping atmospheric chemistry and cloud development. They also found that emissions from oil extraction significantly change the chemical makeup of the surrounding air. Together, these influences create feedback processes that speed up sea ice loss and intensify warming across the Arctic.
The study was recently published in the Bulletin of the American Meteorological Society.
Understanding Arctic Chemistry Through CHACHA
The research was carried out as part of a broader collaboration known as CHemistry in the Arctic: Clouds, Halogens, and Aerosols, or CHACHA.
This multi-institutional project, led by five research organizations, focuses on how chemical reactions evolve as air near the surface rises into the lower atmosphere. These changes drive interactions between moisture, low-level clouds, and pollutants that are critical to understanding Arctic climate behavior.
“This field campaign is an unprecedented opportunity to explore chemical changes in the boundary layer — the atmospheric layer closest to the planet’s surface — and to understand how human influence is altering the climate in this important region,” said Jose D. Fuentes, professor of meteorology in the Department of Meteorology and Atmospheric Science and corresponding author of the paper.
“The resulting datasets are producing an improved understanding of the interactions between sea-spray aerosols, surface-coupled clouds, oil field emissions, and multiphase halogen chemistry in the new Arctic.”
To study the chemistry of the boundary layer of the Arctic, researchers sampled air over snow-covered and newly frozen sea ice in the Beaufort and Chukchi Seas, over open leads and across the snow-covered tundra of the North Slope of Alaska, including the oil and gas extraction region near Prudhoe Bay. The campaign was conducted out of Utqiaġvik, Alaska, between February 21 and April 16, 2022, shortly after the polar sunrise — a period of continuous sunlight following two months of darkness — when the increased UV rays intensify the chemical changes at the surface and in the lower atmosphere.
Sea-Ice Leads and Atmospheric Feedbacks
Researchers found that leads — ranging from a few feet to a few miles wide — created intense convective plumes and cloud formations, while lofting potentially harmful molecules, aerosol pollutants, and water vapor — all things that can contribute to warming the climate — hundreds of feet into the atmosphere. These processes accelerated sea-ice loss by forcing even more convection and cloud formation, which increased moisture and heat transfer and led to the formation of even more leads, Fuentes said.
The team identified another feedback loop on land, with chemicals found in the saline snowpacks along the coast reacting with the emissions from the oil field. During the CHACHA campaign, researchers specifically observed bromine production along saline snowpacks — a phenomenon unique to polar regions.
These bromine molecules rapidly depleted ozone in the boundary layer, creating another feedback loop that allows more of the sun’s rays to reach the surface, warming the snowpacks and releasing more bromine.
Industrial Emissions in a Pristine Region
Additionally, during the field campaign, researchers found massive boundary layer changes over the Prudhoe Bay oil fields. Gas plumes from the extraction area reacted in the lower atmosphere, acidifying the air mass and producing harmful substances and smog, Fuentes said. They also found that halogens react with oil field plumes to create free radicals, which then form more stable substances that can travel long distances. Fuentes said these substances can contribute to regional environmental changes.
Fuentes said CHACHA researchers are now investigating how these reactions affect the broader Arctic environment, including the formation of smog plumes that, despite occurring in an otherwise pristine region, reach pollution levels comparable to those found in major urban areas such as Los Angeles. For example, nitrogen dioxide levels reached about 60-70 parts per billion, levels associated with the noxious gases blamed for urban smog.
The next steps, researchers said, involve creating datasets that numerical modelers can use to better understand how global climate may evolve as a result of these localized factors in the Arctic.
Reference: “Overview of the Chemistry in the Arctic: Clouds, Halogens, and Aerosols (CHACHA) Field Campaign” by Jose D. Fuentes, Sara Lance, Kerri A. Pratt, Paul B. Shepson, William R. Simpson, Izabella Antczak, Katja Bigge, Nathaniel Brockway, Natasha Garner, Kristian D. Hajny, Daun Jeong, Robert Kaeser, Peter K. Peterson, Miranda Serratos, Tim Starn, Brian H. Stirm and Sarah Woods, 13 November 2025, Bulletin of the American Meteorological Society.
DOI: 10.1175/BAMS-D-24-0192.1
Other CHACHA team members were from Stony Brook University, the University at Albany, University of Michigan and University of Alaska Fairbanks. This research was funded by the U.S. National Science Foundation.
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4 Comments
thanks for this
“Climate Change – Climate change” – where have I heard that? Oh yeah, we’re 0.02% atmospheric carbon away from all plant life dying away via carbon starvation and the propagandists are still at it!
When the next round of archaeologists finally dig up these publications, 2000 years from now, they’ll piece together why the huge die off happened: stupidity.
“Earth’s climate is shifting rapidly, with the most dramatic changes occurring in polar regions.”
Actually, that should be the “Arctic,” not “polar regions.” While West Antarctica appears to be warming, the cause is confounded by the geothermal activity of the area; East Antarctic is problematic for the claim.
CO2 is typically characterized as being “well-mixed”; however, “well-mixed” is rarely defined. Interestingly, when one examines the seasonal variations by latitude, it is obvious that the seasonal range is much greater in the Arctic than anywhere else on Earth. [See here: https://www.researchgate.net/profile/Martin-Manning/publication/48602774/figure/fig2/AS:669455969419264@1536622149012/Global-average-distribution-of-atmospheric-carbon-dioxide-in-the-marine-background-by.png ] This variation is accepted as being biogenic in origin. While we are told that global warming is driven by anthropogenic CO2 emissions, the empirical evidence provided by the linked graph, does not support that claim. Clearly, the annual northern hemisphere variations are driven by Winter microbial/fungal decomposition of organic material, aided by boreal forest respiration, and Summer photosynthetic withdrawal. There are many complications, but this isn’t the place to address all of them.
“The campaign was conducted out of Utqiaġvik, Alaska, between February 21 and April 16, 2022, shortly after the polar sunrise — a period of continuous sunlight following two months of darkness — when the increased UV rays intensify the chemical changes at the surface and in the lower atmosphere.”
Were measurements of surface UV flux measured during the campaign? If so, why wasn’t it mentioned in either this article or the source AMS article? Having spent the month of April in what was then known as Point Barrow, I can assure readers that one doesn’t get a sunburn at that latitude, let alone even a tan. One is lucky to even see the sun through the snow and rain clouds.
The source article remarks, “Following polar sunrise, Br2 molecules undergo photolysis to produce bromine (Br) atoms that rapidly react with O3, leading to near-surface ozone depletion events (ODEs) in the ABL … These events can last up to 12 consecutive days and lead to ozone-free air layers extending from the surface to as much as 2 km …” One doesn’t expect to observe much ozone below the stratosphere, except in places like Los Angeles!
Photolytic destruction of ozone has been documented in Antarctica on the surface of stratospheric ice crystals with adsorption of bromides, and associated sunlight. Indeed, the point has been made numerous times that the so-called Antarctic ‘Ozone Hole’ is the result of the Austral circumpolar vortex, which excludes tropical stratospheric ozone transported by Brewer-Dobson circulation, and also allows extremely cold air to form, which creates the essential reactive ice crystals. In warm years, with either a weak circumpolar vortex, or early break-up, the stratospheric ‘Hole’ has minimal area.
Surface ozone is a completely different phenomenon. It is essentially smog, and not susceptible to the cold photolysis. One should note that all of the indigenous people in Point Barrow own at least one snowmobile and usually a pickup truck. Their homes are heated with natural gas, and diesel generators create electricity for homes, the Army base, and other numerous installations in the area. What the researchers are probably observing is ground-level smog that accumulates and then gets blown away by winds every week or two.
Once again, expensive field research doesn’t seem to have the expected sophistication of good design and comprehensive understanding of the situation.