Staying Up To Date‎ > ‎Ozone‎ > ‎

10. Other Face

The Other Face of Ozone

2012-10-18. Scientists find ozone causes forests to use more water, reducing availability in the Southeast. Forest Service and Oak Ridge National Laboratory (ORNL) scientists have found that rising levels of ozone, a greenhouse gas, may amplify the impacts of higher temperatures and reduce streamflow from forests to rivers, streams, and other water bodies. Such effects could potentially reduce water supplies available to support forest ecosystems and people in the southeastern United States.
Impacts of ozone, a global scale pollutant, on forests are not well understood at a large scale. This modeling study indicates that current and projected increases in ozone in the 21st century will likely enhance the negative effects of warming on watersheds, aggravating drought and altering stream flow. …Published in the November issue of the journal Global Change Biology, the study suggests that ozone has amplified the effects of warmer temperatures in reducing streamflow in forested watersheds in the southeastern United States. Read more at:

2011 October 11.  Groups Sue After E.P.A. Fails to Shift Ozone Rules.  By John M. Broder, The NY Times.  Excerpt:  ...WASHINGTON — Five health and environmental groups sued the Obama administration on Tuesday over its rejection of a proposed stricter new standard for ozone pollution, saying the decision was driven by politics and ignored public health concerns.
The groups said that President Obama’s refusal to adopt the new standard was illegal and left in place an inadequate air quality rule from the Bush administration. Near the end of his presidency, George W. Bush overruled  the Environmental Protection Agency’s scientific advisory panel and set the permissible ozone exposure at 75 parts per billion....  [See also: A Closer look: Setting a 'safer' ozone level.  By Jill U. Adams, The Los Angeles Times.]       

2009 Feb 13. USA Today special report on air pollution near schools. USA today used an EPA model to track the path of industrial pollution and mapped the locations of almost 128,000 schools to determine the levels of toxic chemicals outside....
Interactive Map: Schools that ranked the worst.

2009 January 16. Sniffing Out Smog. By Kathleen M. Wong, ScienceMatters@Berkeley, Volume 6, Issue 40. Excerpt: If smog were a kitchen creation, the recipe would go something like this: Start with a miasma of organic hydrocarbons from spilled gasoline, incomplete combustion and trees. Add nitrogen oxides from combustion in factory furnaces and vehicle engines. Zap with a dose of sunlight, and wait. The result: a heaping serving of photochemical smog.
...Atmospheric chemist Ron Cohen studies how these pollutants form, tracks where and how far they travel, and how they get removed from the atmosphere. He then uses this knowledge to understand air quality and the interactions of pollutants with climate. A Berkeley professor of chemistry and earth and planetary sciences, his work provides the factual underpinnings for climate and air pollution models that, ultimately, help keep us all breathing more easily.
...Cohen tracks air pollution from its molecular origins through its metamorphosis into ugly yellow smog. To do this, he designs and builds instruments capable of measuring minute amounts of the chemicals that contribute to air pollution. Armed with these super sniffers, he can track exactly how fast smog forms and how much of it is in the environment.
"We try to understand how these molecules get into the atmosphere, what their chemistry is, and what they're doing to climate," Cohen says....

May 3, 2004. NASA RELEASE : 04-147 NASA Satellites And Balloons Spot Airborne Pollution "Train" -- NASA scientists discovered pollution could catch an airborne "express train," or wind current, from Asia all the way to the southern Atlantic Ocean. Scientists believe during certain seasons, as much as half of the ozone pollution above the Atlantic Ocean may be speeding down a "train" track of air from the Indian Ocean. As it rolls along, it picks up more smog from air peppered with thunderstorms that bring it up from the Earth's surface. Bob Chatfield, a scientist at NASA's Ames Research Center, Moffett Field, Calif. said, "Man-made pollution from Asia can flow southward, get caught up into clouds, and then move steadily and rapidly westward across Africa and the Atlantic, reaching as far as Brazil." During those periods of exceptionally high ozone in the South Atlantic, especially during late winter, researchers noticed Indian Ocean pollution follows a similar westward route, wafted by winds in the upper air. They found the pollution eventually piles up in the South Atlantic. "We've always had some difficulty explaining all that ozone," Thompson admitted.

Feb 10, 2004. Tango in the Atmosphere: Ozone and Climate Change. NASA Earth Observatory feature article. Ozone's impact on climate consists primarily of changes in temperature. The more ozone in a given parcel of air, the more heat it retains. Ozone generates heat in the stratosphere, both by absorbing the sun's ultraviolet radiation and by absorbing upwelling infrared radiation from the lower atmosphere (troposphere). Consequently, decreased ozone in the stratosphere results in lower temperatures.

November 19, 2003. SAVANNA SMOG - Each August in southern Africa, literally thousands of people equipped with lighters or torches go out into the African savanna, a region dotted with villages and teaming with animals, and intentionally set the dry grasslands ablaze.


Articles from 2003–present