Word: wennberg
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Dates: during 1990-1999
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...Balloons have short flights with no inherent repeatability," Wennberg says. "Aircraft eliminate these limitations...
...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...
...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...
With the ability to go to even greater altitudes than the ER-2 does, Wennberg and Anderson are anxious to gain a more complete understanding of the chemistry of ozone depletion...
...Wennberg notes that the mechanism by which aircraft exhaust is diffused has yet to be explained. "If 10 percent of the exhaust is transported upwards in the atmosphere and 90 percent down, the net ozone loss would be zero," Wennberg says...