Word: anderson
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...fundamental tenet of atmospheric chemistry is that ozone depletion is controlled by nitrogen oxide radicals and the hydrogen oxide and halogen radicals play a much smaller part," Anderson says. "We have experimentally shown that in the lower ozone layer, the hydrogen oxide radicals are on top and the halogen radicals are dominant. The nitrogen oxide radicals play the smallest role at less than 20 percent...
...NASA is funding a 150-million-dollar, 12-year study to understand the atmospheric effects of subsonic and supersonic aircraft," Wesoky adds. "Anderson's group is looking at only one element of six areas, but it is the most expensive and complex...
...complete their study, Wennberg and Anderson flew instruments in a converted U-2 spy plane 20 kilometers (70,000 feet) above the earth's surface. Taking part in the Stratospheric Photo chemistry, Aerosols and Dynamics Expedition [SPADE], the researchers were able to make many measurements simultaneously. This procedure is "unprecedented" according to Ross J. Salawitch, a research associate in Atmospheric Sciences and a co-author of the paper...
...Anderson acknowledges a weakness in their research. "We only have comprehensive measurements from 13 to 20 kilometers," Anderson says. "The region above is unexplored in hard detail. We know there is a point above 20 kilometers where nitrogen radicals control the depletion of ozone...
...some researchers, including Wennberg and Anderson, have been able to take partial measurements at greater altitudes using balloons. "Balloons have been used for years to go to 120,000 feet," says Podolske, "but there are three limitations. You have no control over where the balloon will go, you often have to wait for the right winds and you only get a vertical profile [because the balloon goes up and down...