Long -term research continues following the self -cleaning ability of the atmosphere.

14CO Galaxy source function. Credit: Natural communication (2025). Doi: 10.1038/S41467-024-55603-1
Studies published in Nature Communications have strengthened the ability to remove air pollutants.
Because it is regarded as an understanding of climate science breakthrough and atmosphere chemistry, research on the atmosphere of the atmosphere focuses on determining the amount of Hydroxyl Radical (OH), an unpredictable driver. Ta. Paul Krutzen, a winner.
By applying advanced methods and analyzing two long -term measurements, New Zealand and Antarctica, dating back to the late 1980s, research by New Zealand National Water and Air Research Institute (NIWA) is the atmosphere of the atmosphere. We clarified important trends in. -Mransing function.
This study emphasizes that without the increase in hydroxyl cleaning ability, methane has contributed to global warming.
Long -term research by NIWA scientists has revealed that with the Victoria of Wellington GNS Science researchers and Finnish co -researchers, the atmosphere in the Southern Hemisphere has been enhanced since 1997.
The 33 -year scientific survey focuses on OH, the strongest oxide agent in the atmosphere, and has identified radiation carbon monoxide (14CO) as a reliable tracer. When the cosmic ray hits the atmosphere of the earth, a ultra -range carbon monoxide form is generated, and its production rate is well understood along with OH removal.
Oh, very reactive and very short -lived, saying, Sylvia Nicole, an atmosphere scientist in chicken. “Oh, it is a scavenger of small chemical substances. A purple light from the sun in a water vapor in a water vapor in a single oxygen atoms, composed of one hydrogen and one oxygen atoms. It is formed in the atmosphere.
“It reacts with harmful trace gases, including carbon monoxide and methane, which is the lowest layer of the atmosphere, and this extends to an average height of 11 km (36,000 feet) from the surface of the earth.
“It was a large -scale discovery in the 1970s. OH was generated in a convection area by reaction that enabled gas oxidation such as carbon monoxide, methane, and ethane. It is an important role in purifying the atmosphere.”
According to NICHOL, high -reactionary hydroxyl, which controls most gas, controls most of the gas life of most gas, and the concentration of some greenhouse gases, especially methane, is important. “Hydroxyl radicals appear in a small amount in a short period of time, but are essential to maintaining the energy to remove nearly 90 % of carbon monoxide and methane in air.”
The dynamic nature of OH means that it is famous for being difficult to directly observe and quantitize directly, along with a very low concentration, says Niwa’s main engineer Gordon Brailsford.
“Ultraviolet rays affect the production of hydroxyl, so the level of this atmosphere is very large every day and every year. OH is formed only during the day.
The past attempts to monitor the tendency of OH use methyl chloroform, which is gradually abolished under the 1987 Montreal protocol to protect the ozone layer. Not practical.
“The conventional method and model that predicts the existence of hydroxyl based on methyl chloroform and other similar industrial gas has generated a contradictory estimation value of hydroxyl level change and the ability to purify the atmosphere. We understand the production of lines much better, and will solve the tendency of OH removal over a long period of time. “
The record of the two remote Southern Hemisphere stations dating back to the late 1980s produces high -quality data for analysis, says Brailsford. “The regular and consistent measurement values ​​for 33 years on two sites provide the first evidence of long -term OH increase.
“The bare exposed atmosphere of Wellington, the windy capital of New Zealand, is internationally recognized for long -term surveillance of clean air.
“A joint in New Zealand, about 4,000 km (2,500 miles) south of the south, the US Located Heights Laboratory on Ross Island is far from human pollution, and every year during the 5 months of darkness. Is the most consistent record in the world of 14CO as a change in atmosphere chemistry.
Sampling requires a lot of steps, Rowena Moss, who spent more than 10,000 hours on the project. “Up to 1,000 liters of atmosphere samples were collected in gas cylinders, dried, compressed, cooled to remove the surrounding CO2, and concentrated on carbon monoxide and isotope of microscopes.
“Since these procedures are implemented, it can be sent to measure the sample 14CO by the radioactive carbon of GNS Science and the accelerator mass analysis in the dating laboratories. In these different steps, the original AIR sample 14CO is 14CO. Quality control to determine the concentration is essential.
The two different observation stations samples have been proved to be insight into the role of OH, stated by Journal Paper, More and Climate Scientist Dr. Oraf Mogen Stern.
“New Zealand’s data since 1997 indicates a decrease of 14CO an annual decrease of 12 % (± 2 %). Measurement from Antarctica shows a larger 43 % (± 24 %) decline. It shows the height of the Southern Hemisphere from December to January.
“These survey results suggest that the oxidation capacity of the atmosphere driven by hydroxyl has been enhanced over the past few decades. This result has confirmed and supported our model, and OH is the world. It is backed by models around the world that suggests that it is increasing.
Researchers have investigated which processes and atmosphere compounds have changed the OH level, identifying three major drivers, an increase in hydroxyl, and seeing one driver attenuated the increase in OH. “The increase in hydroxyl trends is mainly driven by nitrogen oxides produced by automobiles, industrial combustion, lightning, and wildfire.
“Hydroxyl is affected by the depletion of ozone in the stratastic and increased water vapor under global warming, but OH has a significant offset for methane, increasing rapidly, and reducing hydroxyl. Ah, especially the change in our activities is going to decrease.
He says that the increase in OH found in this study means that the methane’s light emission rate was much larger than the one that assumed a certain OH. “Or, in a different way, Methane would have contributed to global warming without the strengthening of the atmosphere.
“All four factors, nitrogen, ozone, global warming, and methane, indicate the trend of humans. Human activities affect the ability of climate systems that enhance oxidation. These discoveries. Emphases the important role of human activities in the formation of climate, affects the ability of hydroxide to purify the atmosphere and maintain the quality of air. “
Details: OLAF MORGENSTERN et al, RadioCarbon SOMOXIDE indicates an increase in air -oxidation and natural communication (2025). Doi: 10.1038/S41467-024-55603-1
Provided by the National Water and the Air Research Institute (NIWA)
Quotation: Following the self-cleaning ability of the atmosphere, following the long-term research (January 31, 2025), February 1, 2025 https://phys.org/news/2025-01- ATMOSPHERE-CLEANS-ABILITY Obtained from -Ability-term.html
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