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Friday, January 13, 2012

We Have Another Way To Cool The Earth

Experiment of Manchester University for detect Criegee radical
Experiment for detect Criegee radical (manchester.ac.uk)
Efforts to reduce global warming continues to be done by scientists and heads of state in the world. Hoping there are significant results. Because, without a significant effort then global warming will be a threat for human life.

However, a hope emerged. Research conducted by University of Manchester, University of Bristol, and Sandia National Laboratories reported a potentially revolutionary effect of Criegee biradical. Biradical of Criegee is a kind of chemical molecules, are in atmorfer of the earth and have influence in the process of cooling the planet.

These invisible chemical intermediates are powerful oxidisers of pollutants such as nitrogen dioxide and sulfur dioxide, produced by combustion, and can naturally clean up the atmosphere.

Basically, the presence of Criegee biradical has been advanced by Criegee in 1950. However, just now managed to detect. Scientists now believe that, with further research, these species can play a major role in off-setting climate change.

The detection of the Criegee biradical and measurement of how fast it reacts was made possible by a unique apparatus, designed by Sandia researchers, that uses light from a third-generation synchrotron facility, at the Lawrence Berkeley National Laboratory’s Advanced Light Source.

The intense, tunable light from the synchrotron allowed researchers to discern the formation and removal of different isomeric species – molecules that contain the same atoms but arranged in different combinations.

The researchers found that the Criegee biradicals react more rapidly than first thought and will accelerate the formation of sulphate and nitrate in the atmosphere. These compounds will lead to aerosol formation and ultimately to cloud formation with the potential to cool the planet.

The formation of Criegee biradicals was first postulated by Rudolf Criegee in the 1950s. However, despite their importance, it has not been possible to directly study these important species in the laboratory.

In the last 100 years, Earth's average surface temperature increased by about 0.8 °C with about two thirds of the increase occurring over just the last three decades.

Most countries have agreed that drastic cuts in greenhouse gas emissions are required, and that future global warming should be limited to below 2.0 °C (3.6 °F).

Dr Carl Percival, Reader in Atmospheric Chemistry at The University of Manchester and one of the authors of the paper, believes there could be significant research possibilities arising from the discovery of the Criegee biradicals.

He said: “Criegee radicals have been impossible to measure until this work carried out at the Advanced Light Source. We have been able to quantify how fast Criegee radicals react for the first time.

“Our results will have a significant impact on our understanding of the oxidising capacity of the atmosphere and have wide ranging implications for pollution and climate change.

“The main source of these Criegee biradicals does not depend on sunlight and so these processes take place throughout the day and night.”

Professor Dudley Shallcross, Professor in Atmospheric Chemistry at The University of Bristol, added: “A significant ingredient required for the production of these Criegee biradicals comes from chemicals released quite naturally by plants, so natural ecosystems could be playing a significant role in off-setting warming.’

Source: http://www.manchester.ac.uk/aboutus/news/display/?id=7848

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