Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Air Pollution a Culprit in Worsening Drought and Flooding

15.11.2011
Increases in aerosols can affect cloud development

Increases in air pollution and other particulate matter in the atmosphere can strongly affect cloud development in ways that reduce precipitation in dry regions or seasons.


A radar image of clouds; data from a decade of time played an important role in the results. Credit: ARM Climate Research Facility

This while increasing rain, snowfall and the intensity of severe storms in wet regions or seasons, according to results of a new study.

The research provides the first clear evidence of how aerosols--soot, dust and other particulates in the atmosphere--may affect weather and climate.

The findings have important implications for the availability, management and use of water resources in regions across the United States and around the world.

"Using a 10-year dataset of atmospheric measurements, we have uncovered the long-term, net impact of aerosols on cloud height and thickness and the resulting changes in precipitation frequency and intensity," says Zhanqing Li, an atmospheric scientist at the University of Maryland and lead author of a paper reporting the results.

The paper was published today in the journal Nature Geoscience.

Co-authors are Feng Niu and Yanni Ding, also of the University of Maryland; Jiwen Fan of the U.S. Department of Energy Pacific Northwest National Laboratory; Yangang Liu of the U.S. Department of Energy Brookhaven National Laboratory; and Daniel Rosenfeld of The Hebrew University of Jerusalem.

"Aerosols' effects on cloud and precipitation development are key questions for scientific community," says Chungu Lu, program director in the National Science Foundation's (NSF) Division of Atmospheric and Geospace Sciences, which funded the research.

"The question is not only important for our understanding of the effects of natural processes and human activities on climate change, but for addressing issues in air pollution, disaster relief, water resource management and human weather modification."

In addition to the scope and timeframe of the research team's observations, the scientists matched their findings with results from a cloud-resolving computer model.

"Understanding interactions among clouds, aerosols and precipitation is one of the grand challenges for climate research in the decade ahead," says Tony Busalacchi, a scientist at the University of Maryland and chair of the Joint Scientific Committee of the World Climate Research Program.

"Findings from this study are a significant advance in our understanding of such processes, with implications for both climate science and sustainable development," says Busalacchi.

"We have known for a long time that aerosols impact both the heating and phase changes [such as condensing and freezing] of clouds, and that they can either inhibit or intensify clouds and precipitation," says Russell Dickerson, an atmospheric scientist at the University of Maryland.

"What we have not been able to determine until now is the net effect," says Dickerson. "This study shows that fine particulate matter, mostly from air pollution, impedes gentle rains while exacerbating severe storms. It adds urgency to the need to control sulfur, nitrogen and hydrocarbon emissions."

According to Steve Ghan of the Pacific Northwest National Laboratory, "This work confirms what previous cloud modeling studies had suggested: that although clouds are influenced by many factors, increasing aerosols enhances the variability of precipitation, suppressing it when precipitation is light and intensifying it when it is strong.

"This complex influence is completely missing from climate models, casting doubt on their ability to simulate the response of precipitation to changes in aerosol pollution."

Aerosols are tiny solid particles or liquid particles suspended in air. They include soot, dust and sulfate particles and are what we commonly think of when we talk about air pollution.

Aerosols come, for example, from the combustion of fossil fuels, from industrial and agricultural processes and from the accidental or deliberate burning of fields and forests.

They can be hazardous to human health and the environment.

Aerosol particles also affect the Earth's surface temperature by reflecting light back into space.

The variable cooling and heating that results is, in part, how aerosols modify the stability that dictates atmospheric vertical motion and cloud formation.

Aerosols also affect cloud microphysics because they serve as nuclei around which water droplets or ice particles form.

Both processes can affect cloud properties and rainfall. Different processes may work in harmony or offset each other, leading to complex yet inconclusive interpretations, scientists say, of their long-term net effect.

Researchers agree that greenhouse gases and aerosol particles are two major agents dictating climate change.

The mechanisms of climate warming effects of increased greenhouse gases are clear: they trap solar energy absorbed at the Earth's surface and prevent it from being radiated as heat back into space.

The climate effects of increased aerosols are much less certain.

"This study demonstrates the importance and value of keeping a long record of continuous and comprehensive measurements to identify and quantify the important roles of aerosols in climate processes," says Steve Schwartz, a scientist at Brookhaven National Laboratory.

"While the mechanisms for some of these effects remain uncertain, the well-defined relationships discovered demonstrate their significance," says Schwartz. "Controlling for these processes in models remains a future challenge, but this study clearly points to important directions."

"The findings from ground measurements of long-term effects are consistent with the global effects revealed from satellite measurements reported in our separate study," says Li.

"They attest to the needs of tackling the climate and environmental changes that matter so much to our daily lives."

Media Contacts
Cheryl Dybas, NSF (703) 292-7734 cdybas@nsf.gov
Lee Tune, University of Maryland (301) 405-4679 ltune@umd.edu
The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2011, its budget is about $6.9 billion. NSF funds reach all 50 states through grants to nearly 2,000 universities and institutions. Each year, NSF receives over 45,000 competitive requests for funding, and makes over 11,500 new funding awards. NSF also awards over $400 million in professional and service contracts yearly.

Cheryl Dybas | EurekAlert!
Further information:
http://www.nsf.gov

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: In best circles: First integrated circuit from self-assembled polymer

For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.

In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...

Im Focus: Demonstration of a single molecule piezoelectric effect

Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale

Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...

Im Focus: Hybrid optics bring color imaging using ultrathin metalenses into focus

For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.

But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...

Im Focus: Stem cell divisions in the adult brain seen for the first time

Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.

The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...

Im Focus: Interference as a new method for cooling quantum devices

Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters

Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

2nd International Conference on High Temperature Shape Memory Alloys (HTSMAs)

15.02.2018 | Event News

Aachen DC Grid Summit 2018

13.02.2018 | Event News

How Global Climate Policy Can Learn from the Energy Transition

12.02.2018 | Event News

 
Latest News

Researchers invent tiny, light-powered wires to modulate brain's electrical signals

21.02.2018 | Life Sciences

The “Holy Grail” of peptide chemistry: Making peptide active agents available orally

21.02.2018 | Life Sciences

Atomic structure of ultrasound material not what anyone expected

21.02.2018 | Materials Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>