Study found that:warming effect of carbon black particles are exaggerated

Recently "Science" magazine online edition a new study suggeststhat global climate models may have exaggerated the warming caused by carbonblack particles degree.The study by the University of California,Davis ledan international research team to carry out.

Carbon black is fossil fuels,biofuels and biomass produced by theincomplete combustion of atmospheric warming effect of having a substancethrough the man-made and naturally occurring form of soot comes out.When thecarbon deposited on snow and ice on top,can absorb heat in the atmosphere andreduce the albedo (the ability to reflect sunlight),leading to globalwarming.Reduce atmospheric carbon black has been a short-term climate changemitigation a goal.Earlier studies have shown that the warming effect of carbonblack after carbon dioxide.

"Our findings do not change the fact that this warming-question is to what extent." Environment News Service quoted UC Davisprofessor of civil and environmental engineering Christopher Capa's words,"Our findings should will bring more accurate predictions."

Approximately 20% of the carbon from the combustion of biofuels,and 40% from fossil fuels,and another 40% from open biomass burning.Currently, the major emitters of carbon black in developing countries,andthis trend is expected to worsen.The largest source of carbon in Asia,LatinAmerica and Africa.China and India together accounted for carbon emissions oftotal global carbon emissions by 25-35%.

The other can remain in the atmosphere for centuries differentgreenhouse gases,carbon black particles life span of only one to two weeks,which makes it the means by direct measurement to quantify its impact on aglobal scale is more difficult.Therefore,scientists have had to rely more onmathematical models to understand the carbon black particles on the impact ofclimate change.

Climate models on carbon black has been based on theory andlaboratory experiments created.Model shows that,when other chemicals arecondensed into carbon particles,it will lead to the ability of these particlesto increase global warming.

The new research out of the lab to the outdoors for a two-siteverification.They use direct measurement to determine the actual laboratoryexperiments and how different atmospheric conditions.

The researchers found that compared with laboratory experiments andcompared to the results predicted by the model,on-site chemical and physicalchanges that occur warming on carbon black capacity less affected.Atmosphericchanges that black carbon particles of light absorption capacity increased byabout 6%,rather than 100% of the previous studies suggest.

"This study for the consideration of carbon black on the directeffects of Earth's energy budget makes sense." Capa said

By Betty