Posted on 11/06/2007 6:29:34 AM PST by Red Badger
Alters Picture of Diesel Engine Benefits
Black carbon—contained in soot from the combustion of biomass and fossil fuels—may be responsible for around 16% of the gross warming the planet is currently experiencing and may be the second-most significant global warming pollutant after carbon dioxide and ahead of methane, according to testimony provided by five scientists before the US House Committee on Oversight and Government Reform in October.
Because of their increased fuel efficiency relative to gasoline-engined vehicles, diesels are seen as an improvement overs gasoline vehicles with respect to global warming issues. However, once soot warming is factored in, the difference between the two platforms is greatly reduced, as diesel emits more soot than gasoline.
Testifying before the committee were:
*
Dr. Mark Z. Jacobson, Prof. of Civil and Environmental Engineering, Atmosphere/Energy Program, Stanford University *
Dr. Tami C. Bond, Asst. Prof. of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign *
Dr. V. Ramanathan, Prof. of Climate and Atmospheric Sciences, Scripps Institute of Oceanography, University of San Diego *
Dr. Charles Zender, Assoc. Prof. of Earth System Science, University of California at Irvine. *
Dr. Joel Schwartz, Professor of Environmental Epidemiology, Harvard University
The black carbon in soot performs its warming by absorbing sunlight, converting it into infrared (heat) radiation, and emitting that heat radiation to the air around it. Soot on the surface of snow and sea ice contribute to both the melting of those surfaces as well as the warming of the air.
Because of the relatively short lifetime of soot in the atmosphere compared to greenhouse gases, control of soot may be the fastest method of slowing warming for a specific period, according to Dr. Jacobson.
Black carbon, noted Dr. Bond, adds 2-3 order of magnitude more energy to the climate system than an equivalent mass of CO2 because black carbon is an extremely good absorber of visible light. While carbon dioxide stays in the atmosphere for decades, it absorbs just a small amount of infrared radiation.
Particles from burning biomass (which differ from biofuel particles) are less oily and contain a much lower black carbon fraction than fossil fuel soot particles, according to Dr. Jacobson. Biomass-burning particles thus tend to cool climate on a global scale (although the biomass-burning gas warming exceeds its global cooling due to permanent deforestation. The panel thus focused on soot particles resulting from the combustion of fossil fuels and biofuels.
...fossil fuel plus biofuel soot may contribute to about 16% of gross global warming (warming due to all greenhouse gases plus soot plus the heat island effect), but its control in isolation could reduce 40% of net global warming. —Dr. Jacobson
Methods proposed to control fuel soot include improving engines; switching fuels; adding particle traps; and changing vehicle technologies.
In sum, there is not an advantage and a potential disadvantage of diesel versus gasoline in terms of climate and air pollution impact. However, neither type of vehicle is satisfactory or useful for solving climate and health problems as the emissions from both are very high. Even modest improvements in mileage standards for all vehicles are beneficial, but will only delay the eventual increase in emissions due to a larger population.
A more certain method of reducing global arming caused by both fossil-fuel soot and carbon dioxide is to convert vehicles from fossil fuels to electric, plug-in hybrid or hydrogen fuel cell vehicles, where the electricity or hydrogen is produced by a renewable energy sources [sic], such as wind, solar geothermal, hydroelectric, wave, or tidal power.
Never mind that! I demand to know what you are going to do about the dread water absorption bands Water vapor absorbs at 0.6 µm, 0.72 µm, 0.82 µm, 0.94 µm, 1.10 µm, 1.38 µm, 1.87 µm, 2.70 µm, 3.20 µm, and 6.30 µm.
Well??? Well? WHAT DO WE DO ABOUT THAT??
Sell WATER Credits?
#!~$&**.
With the rate temperature is dropping these days, we will need more glow-bull warming to just keep warm. RSS MSU: October 2007 was 2nd coolest month in this century. At this rate, 2007 will enter the record books as the coldest year in the last 100.
Keep in mind that NASA has had to reduce the recent 2000-2007 temperatures, and now the 1930s are the warmest decade on record. Maybe the 1975 predictions were right all along. The sun stays stuck at zero sunspots, a good sign of the coming ice age :-)
When facts don't meet up with your reality, I choose to substitute my own :^)
Sounds like a part of DUNE........
Watch them utterly freak out if someone proposes a simple, inexpensive, passive soot filter for diesel exhaust pipes.
“NOOO! NOOO!!!! YOU *MUST* BAN ALL DIESELS!!!!! THERE IS *NO* ALTERNATIVE!!!!!!!!!!!”
Just when have facts ever mattered to these Earth worshiping neo-Luddite loonies?.......Nevermind the facts, just ban all modern technology...............
Great point!! It’s like a 9-1 ratio. And C02 is more a byproduct of warming, then it is a cause.
During the day, it blocks the sunlight. During the night, it traps the earth’s heat. Its a wash.
An eruption will cause cooling, but between eruptions an active volcano emits staggering amounts of CO2 and other gases. The cooling from eruptions is caused by soot thrown into the air.
True. IIRC the record shows a lag of ~400 years between higher temperatures and increased CO2 levels.
Reduced air pollution and increased water evaporation appear to be adding to man-made global warming.
Research presented at a major European science meeting adds to other evidence that cleaner air is letting more solar energy through to the Earth’s surface.
http://news.bbc.co.uk/2/hi/science/nature/4880328.stm
Mike
I’m doing MY part!..............
I know...........
Mike (my name, too!)............
http://www.coatesengine.com/ check out this site.
There is a great irony in remembering all the environmentalist wackos in the 1970s with bumper stickers on their Volvos and vans that said..”Split wood not atoms” since what they were advocating was putting far more pollution into the atmosphere than any nuclear plant. However, dihydrogen monoxide is a far more serious greenhouse gas and the Democrats in Congress should seek to ban its use.
HA, I saw a couple of dorks riding something like that while I was out walking the dog. They seemed puzzled when I burst out laughing.
Hey Light a forest fire and see how much trouble you are in. Don’t say you were cold because burning wood for heat is already illegal in most places.
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