Navigation Links
Research is getting closer to understanding critical nucleus in haze formation, prof says

COLLEGE STATION, June 14, 2010 - Haze, scientifically known as atmospheric aerosols - microscopic particles suspended in the Earth's atmosphere - represents a major environmental problem because it degrades visibility, affects human health and influences the climate. Despite its profound impacts, how the haze is formed is not fully understood, says a Texas A&M University professor of atmospheric sciences and chemistry who has studied air chemistry for more than 20 years.

Professor Renyi Zhang published his work in the June 11 issue of Science magazine, summarizing recent findings and new research directions that could pave the way for a better understanding of aerosol formation.

"Aerosols, also referred to as haze, influence climate by absorbing and reflecting solar radiation and modifying cloud formation," he explains. "A better understanding of how aerosols form in the atmosphere will greatly improve climate models.

"But, formation of aerosols in the atmosphere is not fully understood, particularly at the molecular level, creating one of the largest sources of uncertainty in climate predictions," he adds.

For aerosols to form, the bonding particles must cross an energy threshold, which the scientists call nucleation barrier. Once the barrier is crossed, aerosol formation can happen spontaneously, he notes.

The interaction between organic acids and sulfuric acid can facilitate the crossing of the barrier by creating a critical nucleus, the Texas A&M professor says in the Science article.

Large amounts of organic gases are emitted to the atmosphere by plants, industry and automobiles and form organic acids; sulfur dioxide, on the other hand, are produced by human activities, such as burning coals, and then form sulfuric acid.

To better understand aerosol formation, scientists need to predict the nucleation rate based on knowledge of the composition of the critical nucleus, Zhang explains.

This knowledge can be obtained by combining theoretical approaches with "measurements of the size and chemical composition of freshly nucleated nanoparticles in the laboratory and in the field," Zhang notes.

Understanding and eventually controlling aerosol formation may help the environment, benefit human health and improve climate prediction, he says.


Contact: Keith Randall
Texas A&M University

Related biology news :

1. Research shows skeleton to be endocrine organ
2. Newly created cancer stem cells could aid breast cancer research
3. Dominant cholesterol-metabolism ideas challenged by new research
4. Researchers identify proteins involved in new neurodegenerative syndrome
5. Texas researchers and educators head for Antarctica
6. MGH researchers describe new way to identify, evolve novel enzymes
7. University of Pennsylvania researchers develop formula to gauge risk of disease clusters
8. University of Oregon researcher finds that on waters surface, nitric acid is not so tough
9. U of MN researchers discover noninvasive diagnostic tool for brain diseases
10. U of Minnesota researchers discover noninvasive diagnostic tool for brain diseases
11. Story ideas from the Journal of Lipid Research
Post Your Comments:
(Date:10/27/2015)... YORK , Oct. 27, 2015 In ... major issues of concern for various industry verticals such ... is due to the growing demand for secure & ... in various ,sectors, such as hacking of bank accounts, ... for electronic equipment such as PC,s, laptops, and smartphones ...
(Date:10/26/2015)... LAS VEGAS , Oct. 26, 2015 /PRNewswire/ ... innovator in modern authentication and a founding member of ... of its latest version of the Nok Nok™ S3 ... use standards-based authentication that supports existing and emerging methods ... is ideal for organizations deploying customer-facing applications that require ...
(Date:10/22/2015)... 2015  Aware, Inc. (NASDAQ: AWRE ), a leading supplier ... third quarter ended September 30, 2015.  --> ... was $4.0 million, a decrease of 33% compared to $6.0 million ... quarter of 2015 was $2.2 million, or $0.10 per diluted share, ... the same period a year ago.  --> ...
Breaking Biology News(10 mins):
(Date:11/25/2015)... ... November 25, 2015 , ... ... Organization of Black Aerospace Professionals (OPBAP) has been formalized with the signing of ... team leaders met with OPBAP leaders Capt. Karl Minter and Capt. Albert Glenn ...
(Date:11/24/2015)... ... November 24, 2015 , ... The United States Golf Association (USGA) ... USGA Green Section Award. Presented annually since 1961, the USGA Green Section Award recognizes ... with turfgrass. , Clarke, of Iselin, N.J., is an extension specialist of ...
(Date:11/24/2015)... Florida (PRWEB) , ... November 24, 2015 , ... ... biggest event of the year and one of the premier annual events for ... and ran from 8–11 November 2015, where ISPE hosted the largest number of ...
(Date:11/24/2015)... ... 24, 2015 , ... The Academy of Model Aeronautics (AMA), led by its ... as Multirotor Grand Prix, to represent the First–Person View (FPV) racing community. , FPV ... embraced this type of racing and several new model aviation pilots have joined the ...
Breaking Biology Technology: