Local emissions amplify regional haze and particle growth
2021-01-29
(Press-News.org) New particle formation (NPF) is a major source of aerosol particles in the global atmosphere. In polluted megacities, such as Beijing, the role of new particle formation events and their contribution to haze formation through subsequent growth is still unclear.
To improve the understanding of the sources, meteorological conditions, and chemistry behind air pollution, the research teams led by Prof. Yele Sun with the Institute of Atmospheric Physics at the Chinese Academy of Sciences and Prof. Markku Kulmala with the University of Helsinki performed simultaneous measurements of aerosol composition and particle number size distributions at ground level and at 260 m in central Beijing, China, during a total of 4 months in 2015-2017. Their study was recently published in npj Climate and Atmospheric Science.
"The haze formation is initiated by the growth of freshly formed particles at both ground level and city aloft. However, the haze was more severe at ground level because of higher particle growth rates due to the impacts of local primary particles and gaseous precursors." said Prof. Sun.
According to Prof. Sun, the particle growth creates a feedback loop, in which a further development of haze increases the atmospheric stability. It in turn strengthens the persisting apparent decoupling between the two heights and increases the severity of haze at ground level.
The team further complemented the field observations with NAQPMS+APM model analyses, and found that the haze associated with NPF and growth was formed on a regional scale in Beijing-Tianjin-Hebei area. Prof. Sun said, "The growth of NPF-originated particles accounts for up to ?60% of the accumulation mode particles, and drives the haze formation in the Beijing-Tianjin-Hebei area."
The team also performed simulations on how emission reductions would affect haze development. "Concentration of both primary and secondary particles in the accumulation mode would decrease drastically, and the haze formation would be reduced if the emission cuts are higher than 30%." Concluded Prof. Sun. "Our results show that a reduction in anthropogenic gaseous precursors can suppress particle growth, and therefore is a critical step for haze alleviation."
INFORMATION:
[Attachments] See images for this press release:
ELSE PRESS RELEASES FROM THIS DATE:
2021-01-29
Research on manufacturing battery cells is gaining momentum - and there is a strong need, considering the future demand for energy storage: For the year 2030, global production of rechargeable batteries will double from today's 750 gigawatt hours (GWh) per year to 1,500 GWh. A recently published review article in the magazine "Nature Energy" on cell production of various battery types suggests that the currently established lithium-ion batteries (LIB) dominate the market of rechargeable high-energy batteries in the coming years. Alternative battery technologies, ...
2021-01-29
Large parts of today's Sahara Desert were green thousands of years ago. Prehistoric engravings of giraffes and crocodiles testify to this, as does a stone-age cave painting in the desert that even shows swimming humans. However, these illustrations only provide a rough picture of the living conditions. Recently, more detailed insights have been gained from sediment cores extracted from the Mediterranean Sea off the coast of Libya. An international research team examined these cores and discovered that the layers of the seafloor tell the story of major environmental changes in North Africa over ...
2021-01-29
The biological process of photosynthesis is found at the beginning of nearly all food chains. It produces oxygen to breathe and provides the energetic foundation for using biotechnological processes to synthesize biofuels and chemical feedstock. Therefore, researchers are particularly interested in rapidly growing cyanobacteria. These organisms use light as an energy source and can carry out photosynthesis, similar to plants. However, the required photosynthetic protein complexes bind many nutrients. Vanessa Krauspe and Prof. Dr. Wolfgang Hess from the working group for Genetics & Experimental Bioinformatics of the Faculty of Biology of ...
2021-01-29
Who hasn't at some point been chewing on an almond and tasted an unpleasant and unexpected aftertaste that has nothing to do with the taste we are used to from one of the most consumed nuts in the world? The culprit has a name: amygdalin, a diglucoside that, when in contact with enzymes present in saliva, breaks down into glucose, benzaldehyde (the cause of the bitter taste) and hydrogen cyanide.
To reduce this unpleasant 'surprise', the Farming Systems Engineering (AGR-128) and Food Technology (AGR-193) research groups at the University of Cordoba's School of Agricultural and Forestry Engineering, ...
2021-01-29
SORLA is a protein trafficking receptor that has been mainly studied in neurons, but it also plays a role in cancer cells. Professor Johanna Ivaska's research group at Turku Bioscience observed that SORLA functionally contributes to the most reported therapy-resistant mechanism by which the cell-surface receptor HER3 counteracts HER2 targeting therapy in HER2-positive cancers. Removing SORLA from cancer cells sensitized anti-HER2 resistant breast cancer brain metastasis to targeted therapy.
HER2 protein is a strong driver of tumor growth. HER2 amplification occurs ...
2021-01-29
High-intensity tropical cyclones have been moving closer to coasts over the past 40 years, potentially causing more destruction than before.
The trend of tropical cyclones - commonly known as hurricanes or typhoons - increasingly moving towards coasts over the past 40 years appears to be driven by a westward shift in their tracks, say the study's authors from Imperial College London.
While the underlying mechanisms are not clear, the team say it could be connected to changes in tropical atmospheric patterns possibly caused by climate change. The research is published today in Science.
Globally, 80 to 100 cyclones develop over tropical oceans each year, impacting regions in the Pacific, ...
2021-01-29
New research by Mimi E. Lam (University of Bergen) just published in Humanities and Social Sciences Communications identifies and explores the impacts of salient viral or COVID-19 behavioural identities that are emerging.
"These emergent COVID-19 behavioural identities are being hijacked by existing social and political identities to politicize the pandemic and heighten racism, discrimination, and conflict," says Lam. She continues: "the COVID-19 pandemic reminds us that we are not immune to each other. To unite in our fight against the pandemic, it is important to recognize the basic dignity of all and value the human diversity currently dividing us."
"Only ...
2021-01-29
Drawing on animal-foraging theory, a new model predicts psychological factors that may lead to panic buying during times of crisis. The model is largely supported by real-world data from the COVID-19 pandemic. Richard Bentall of the University of Sheffield, England, and colleagues presented these findings in the open-access journal PLOS ONE on January 27.
In the early stages of the pandemic, consumers in several countries around the world engaged in "panic buying" of household items, causing temporary shortages of toilet rolls and other products. Such behavior is typical during times of crisis, but few studies have examined the psychology of crisis-driven over-purchasing.
To better understand this phenomenon, Bentall and colleagues turned to animal-foraging ...
2021-01-29
As one of the most experienced archaeologists studying California's Native Americans, Lynn Gamble(link is external) knew the Chumash Indians had been using shell beads as money for at least 800 years.
But an exhaustive review(link is external) of some of the shell bead record led the UC Santa Barbara professor emerita of anthropology to an astonishing conclusion: The hunter-gatherers centered on the Southcentral Coast of Santa Barbara were using highly worked shells as currency as long as 2,000 years ago.
"If the Chumash were using beads as money 2,000 years ago," Gamble said, "this changes our thinking of hunter-gatherers and sociopolitical and economic complexity. This may be the first example of the use of money anywhere in the ...
2021-01-29
As part of standard patient protocol, doctors inform women of the risks of pregnancy. But there is one exception to this standard: stillbirth.
University of Arkansas law professor Jill Wieber Lens argues that women have a right to know of the risk of stillbirth, and, consistent with the evolution of informed consent law, this right should be enforceable through a medical malpractice tort claim.
Stillbirth, or pregnancy loss after 20 weeks but before birth, is not uncommon. Annually, 26,000 U.S. women give birth to a stillborn baby, or roughly one out every 160 pregnancies. The United States' stillbirth rate ...
LAST 30 PRESS RELEASES:
[Press-News.org] Local emissions amplify regional haze and particle growth
