Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Researchers Shows Emissions From Forests Influence Very First Stage of Cloud Formation

16.05.2014

Research from CLOUD Experiment at CERN, Which Includes Carnegie Mellon's Neil Donahue, Contributes to Better Understanding of Connection Between Clouds and Climate

Clouds play a critical role in Earth's climate. Clouds also are the largest source of uncertainty in present climate models, according to the latest report of the Intergovernmental Panel on Climate Change. Much of the uncertainty surrounding clouds' effect on climate stems from the complexity of cloud formation.


New research from scientists at the CLOUD (Cosmics Leaving OUtdoor Droplets) experiment at CERN, including Carnegie Mellon University's Neil Donahue, sheds light on new-particle formation — the very first step of cloud formation and a critical component of climate models. The findings, published in the May 16 issue of Science, closely match observations in the atmosphere and can help make climate prediction models more accurate.

Cloud droplets form when water vapor in the atmosphere condenses onto tiny particles. These particles are emitted directly from natural sources or human activity, or they form from precursors emitted originally as gaseous pollutants. The transformation of gas molecules into clusters and then into particles, a process called nucleation, produces more than half of the particles that seed cloud formation around the world today. But the mechanisms underlying nucleation remain unclear. Although scientists have observed that the nucleation process nearly always involves sulfuric acid, sulfuric acid concentrations aren't high enough to explain the rate of new particle formation that occurs in the atmosphere. This new study uncovers an indispensable ingredient to the long sought-after cloud formation recipe — highly oxidized organic compounds.

"Our measurements connect oxidized organics directly, and in detail, with the very first steps of new particle formation and growth," said Donahue, professor of chemistry, chemical engineering, engineering and public policy, and director of CMU's Steinbrenner Institute for Environmental Education and Research. "We had no idea a year ago that this chemistry was happening. There's a whole branch of oxidation chemistry that we didn't really understand. It's an exciting time."

The air we breathe is chock-full of organic compounds, tiny liquid or solid particles that come from hundreds of sources including trees, volcanoes, cars, trucks and wood fires. Once they enter the atmosphere, these so-called organics start to change. In research published in the Proceedings of the National Academy of Sciences in 2012, Donahue and colleagues showed conclusively that organic molecules given off by pine trees, called alpha-pinene, are chemically transformed multiple times in the highly oxidizing environment of the atmosphere. Additionally, other research, including from Donahue's lab, has suggested that such oxidized organics might take part in nucleation — both in new particle formation and in their subsequent growth. Donahue and an international team of researchers with the CLOUD experiment at CERN set out to test that hypothesis.

The CLOUD project at CERN is a unique facility that allows scientists to reproduce a typical atmospheric setting inside of an essentially contaminant-free, stainless steel chamber. By performing experiments in the precisely controlled environment of the CLOUD chamber, the project's scientists can change the concentrations of chemicals involved in nucleation and then measure the rate at which new particles are created with extreme precision.

In the current work, the team filled the chamber with sulfur dioxide and pinnanediol (an oxidation product of alpha-pinene) and then generated hydroxyl radicals (the dominant oxidant in Earth's atmosphere). Then they watched the oxidation chemistry unfold. Using very high-resolution mass spectrometry, the scientists were able to observe particles growing from single, gaseous molecules to clusters of up to 10 molecules stuck together, as they grew molecule by molecule.

"It turns out that sulfuric acid and these oxidized organic compounds are unusually attracted to each other. This remarkably strong association may be a big part of why organics are really drawn to sulfuric acid under modern polluted conditions," Donahue said.

After confirming that oxidized organics are involved in the formation and growth of particles under atmospheric conditions, the scientists incorporated their findings into a global particle formation model. The fine-tuned model not only predicted nucleation rates more accurately but also predicted the increases and decreases of nucleation observed in field experiments over the course of a year, especially for measurements near forests. This latter test is a strong confirmation of the fundamental role of emissions from forests in the very first stage of cloud formation, and that the new work may have succeeded in modeling that influence.

###

New research from scientists at the CLOUD (Cosmics Leaving OUtdoor Droplets) experiment at CERN, including Carnegie Mellon's Neil Donahue, is contributing to a better understanding of the connection between clouds and climate.

Jocelyn Duffy | Eurek Alert!
Further information:
http://www.cmu.edu/news/stories/archives/2014/may/may15_cloudsandclimate.html

Further reports about: CERN Cloud acid atmosphere concentrations formation nucleation particles sulfuric

More articles from Earth Sciences:

nachricht Clouds and climate in the pre-industrial age
30.05.2016 | Goethe-Universität Frankfurt am Main

nachricht Researchers find higher than expected carbon emissions from inland waterways
25.05.2016 | Washington State University

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Worldwide Success of Tyrolean Wastewater Treatment Technology

A biological and energy-efficient process, developed and patented by the University of Innsbruck, converts nitrogen compounds in wastewater treatment facilities into harmless atmospheric nitrogen gas. This innovative technology is now being refined and marketed jointly with the United States’ DC Water and Sewer Authority (DC Water). The largest DEMON®-system in a wastewater treatment plant is currently being built in Washington, DC.

The DEMON®-system was developed and patented by the University of Innsbruck 11 years ago. Today this successful technology has been implemented in about 70...

Im Focus: Computational high-throughput screening finds hard magnets containing less rare earth elements

Permanent magnets are very important for technologies of the future like electromobility and renewable energy, and rare earth elements (REE) are necessary for their manufacture. The Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, Germany, has now succeeded in identifying promising approaches and materials for new permanent magnets through use of an in-house simulation process based on high-throughput screening (HTS). The team was able to improve magnetic properties this way and at the same time replaced REE with elements that are less expensive and readily available. The results were published in the online technical journal “Scientific Reports”.

The starting point for IWM researchers Wolfgang Körner, Georg Krugel, and Christian Elsässer was a neodymium-iron-nitrogen compound based on a type of...

Im Focus: Atomic precision: technologies for the next-but-one generation of microchips

In the Beyond EUV project, the Fraunhofer Institutes for Laser Technology ILT in Aachen and for Applied Optics and Precision Engineering IOF in Jena are developing key technologies for the manufacture of a new generation of microchips using EUV radiation at a wavelength of 6.7 nm. The resulting structures are barely thicker than single atoms, and they make it possible to produce extremely integrated circuits for such items as wearables or mind-controlled prosthetic limbs.

In 1965 Gordon Moore formulated the law that came to be named after him, which states that the complexity of integrated circuits doubles every one to two...

Im Focus: Researchers demonstrate size quantization of Dirac fermions in graphene

Characterization of high-quality material reveals important details relevant to next generation nanoelectronic devices

Quantum mechanics is the field of physics governing the behavior of things on atomic scales, where things work very differently from our everyday world.

Im Focus: Graphene: A quantum of current

When current comes in discrete packages: Viennese scientists unravel the quantum properties of the carbon material graphene

In 2010 the Nobel Prize in physics was awarded for the discovery of the exceptional material graphene, which consists of a single layer of carbon atoms...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Networking 4.0: International Laser Technology Congress AKL’16 Shows New Ways of Cooperations

24.05.2016 | Event News

Challenges of rural labor markets

20.05.2016 | Event News

International expert meeting “Health Business Connect” in France

19.05.2016 | Event News

 
Latest News

3-D model reveals how invisible waves move materials within aquatic ecosystems

30.05.2016 | Materials Sciences

Spin glass physics with trapped ions

30.05.2016 | Materials Sciences

Optatec 2016: Robust glass optical elements for LED lighting

30.05.2016 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>