Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Air pollution is reducing the amount of rain in China

31.08.2009
Air pollution in eastern China during the last 50 years has led to a reduction in the amount of light rainfall of almost a quarter.

This is revealed by an international study conducted with support from the University of Gothenburg, Sweden. There is a risk that the consequences will be increased drought, reduced harvests and poorer public health.

China's dramatic growth has also brought about an increase in environmental problems. At the same time as the population has more than doubled during the last century, emissions into the atmosphere have increased by 800 percent. The environmental impact has been particularly pronounced in eastern China, where most of the people live and where the emissions are greatest: it does not rain in the same way as it did before.

In some parts of eastern China the number of days with rain has diminished by 23 percent in 50 years. The consequences are increased drought and poorer harvests. A team of climate researchers from the USA, China and Sweden - including Deliang Chen, Professor of Physical Meteorology in the Department of Earth Sciences, University of Gothenburg - has now studied the problem and demonstrated that the reduced amounts of rainfall have a direct connection with high concentrations of air pollution.

According to the researchers, the failure of rain to appear has a direct link to the concentrations of aerosol in the atmosphere. Researchers have long been aware that aerosol, which consists of small particles surrounded by gas and water, has the capacity to "gather" raindrops around it in clouds. However, in the current study the researchers discovered that where there was a high aerosol content, the raindrops were considerably smaller - in some cases only half the normal size. As it is more difficult for smaller raindrops to coalesce into rain clouds that can release rain, the air pollution thus leads to the reduction in light rainfall (under 10 millimetres).

The study, which is based on data from 162 weather stations, is published in the Journal of Geophysical Research. http://www.agu.org/pubs/crossref/2009/2008JD011575.shtml

Helena Aaberg | idw
Further information:
http://www.gu.se/
http://www.agu.org/pubs/crossref/2009/2008JD011575.shtml

More articles from Ecology, The Environment and Conservation:

nachricht Listening in: Acoustic monitoring devices detect illegal hunting and logging
14.12.2017 | Gesellschaft für Ökologie e.V.

nachricht How fires are changing the tundra’s face
12.12.2017 | Gesellschaft für Ökologie e.V.

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

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

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

Im Focus: Successful Mechanical Testing of Nanowires

With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong

Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Plasmonic biosensors enable development of new easy-to-use health tests

14.12.2017 | Health and Medicine

New type of smart windows use liquid to switch from clear to reflective

14.12.2017 | Physics and Astronomy

BigH1 -- The key histone for male fertility

14.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>